+2015-06-09 Alexandre Oliva <aoliva@redhat.com>
+
+ Revert:
+ 2015-06-09 Alexandre Oliva <aoliva@redhat.com>
+ PR rtl-optimization/64164
+ * Makefile.in (OBJS): Drop tree-ssa-copyrename.o.
+ * tree-ssa-copyrename.c: Removed.
+ * opts.c (default_options_table): Drop -ftree-copyrename. Add
+ -ftree-coalesce-vars.
+ * passes.def: Drop all occurrences of pass_rename_ssa_copies.
+ * common.opt (ftree-copyrename): Ignore.
+ (ftree-coalesce-inlined-vars): Likewise.
+ * doc/invoke.texi: Remove the ignored options above.
+ * gimple-expr.h (gimple_can_coalesce_p): Move declaration
+ * tree-ssa-coalesce.h: ... here.
+ * tree-ssa-uncprop.c: Include tree-ssa-coalesce.h and other
+ headers required by it.
+ * gimple-expr.c (gimple_can_coalesce_p): Allow coalescing
+ across variables when flag_tree_coalesce_vars. Check register
+ use and promoted modes to allow coalescing. Moved to
+ tree-ssa-coalesce.c.
+ * tree-ssa-live.c (struct tree_int_map_hasher): Move along
+ with its member functions to tree-ssa-coalesce.c.
+ (var_map_base_init): Likewise. Renamed to
+ compute_samebase_partition_bases.
+ (partition_view_normal): Drop want_bases parameter.
+ (partition_view_bitmap): Likewise.
+ * tree-ssa-live.h: Adjust declarations.
+ * tree-ssa-coalesce.c: Include explow.h.
+ (build_ssa_conflict_graph): Process PARM_ and RESULT_DECLs's
+ default defs at the entry point.
+ (dump_part_var_map): New.
+ (compute_optimized_partition_bases): New, called by...
+ (coalesce_ssa_name): ... when flag_tree_coalesce_vars, instead
+ of compute_samebase_partition_bases. Adjust.
+ * alias.c (nonoverlapping_memrefs_p): Disregard gimple-regs.
+ * cfgexpand.c (leader_merge): New.
+ (get_rtl_for_parm_ssa_default_def): New.
+ (set_rtl): Merge exprs and attrs, even for MEMs and non-SSA
+ vars. Update DECL_RTL for PARM_DECLs and RESULT_DECLs too.
+ (expand_one_stack_var_at): Handle anonymous SSA_NAMEs. Drop
+ redundant MEM attr setting.
+ (expand_one_stack_var_1): Handle anonymous SSA_NAMEs. Renamed
+ from...
+ (expand_one_stack_var): ... this. New wrapper to check and
+ skip already expanded SSA partitions.
+ (record_alignment_for_reg_var): New, factored out of...
+ (expand_one_var): ... this.
+ (expand_one_ssa_partition): New.
+ (adjust_one_expanded_partition_var): New.
+ (expand_one_register_var): Check and skip already expanded SSA
+ partitions.
+ (expand_used_vars): Don't create DECLs for anonymous SSA
+ names. Expand all SSA partitions, then adjust all SSA names.
+ (pass::execute): Replace the loops that set
+ SA.partition_to_pseudo from partition leaders and cleared
+ DECL_RTL for multi-location variables, and that which used to
+ rename vars and set attrs, with one that clears DECL_RTL and
+ checks that PARMs and RESULTs default_defs match DECL_RTL.
+ * cfgexpand.h (get_rtl_for_parm_ssa_default_def): Declare.
+ * emit-rtl.c (set_reg_attrs_for_parm): Handle NULL decl.
+ * explow.c (promote_ssa_mode): New.
+ * explow.h (promote_ssa_mode): Declare.
+ * expr.c (expand_expr_real_1): Handle anonymous SSA_NAMEs.
+ * function.c: Include cfgexpand.h.
+ (use_register_for_decl): Handle SSA_NAMEs, anonymous or not.
+ (use_register_for_parm_decl): Wrapper for the above to
+ special-case the result_ptr.
+ (rtl_for_parm): Ditto for get_rtl_for_parm_ssa_default_def.
+ (maybe_reset_rtl_for_parm): Reset DECL_RTL of parms with
+ multiple locations.
+ (assign_parm_adjust_stack_rtl): Add all and parm arguments,
+ for rtl_for_parm. For SSA-assigned parms, zero stack_parm.
+ (assign_parm_setup_block): Prefer SSA-assigned location.
+ (assign_parm_setup_reg): Likewise. Use entry_parm for equiv
+ if stack_parm is NULL.
+ (assign_parm_setup_stack): Prefer SSA-assigned location.
+ (assign_parms): Maybe reset DECL_RTL of params. Adjust stack
+ rtl before testing for pointer bounds. Special-case result_ptr.
+ (expand_function_start): Maybe reset DECL_RTL of result.
+ Prefer SSA-assigned location for result and static chain.
+ Factor out DECL_RESULT and SET_DECL_RTL.
+ * tree-outof-ssa.c (insert_value_copy_on_edge): Handle
+ anonymous SSA names. Use promote_ssa_mode.
+ (get_temp_reg): Likewise.
+ (remove_ssa_form): Adjust.
+ * var-tracking.c (dataflow_set_clear_at_call): Take call_insn
+ and get its reg_usage for reg invalidation.
+ (compute_bb_dataflow): Pass it insn.
+ (emit_notes_in_bb): Likewise.
+ * tree-ssa-loop-niter.c (loop_exits_before_overflow): Don't
+ fail assert on conversion between unsigned types.
+
2015-06-09 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/65460
tree-ssa-ccp.o \
tree-ssa-coalesce.o \
tree-ssa-copy.o \
+ tree-ssa-copyrename.o \
tree-ssa-dce.o \
tree-ssa-dom.o \
tree-ssa-dse.o \
if (! DECL_P (exprx) || ! DECL_P (expry))
return 0;
- /* If we refer to different gimple registers, or one gimple register
- and one non-gimple-register, we know they can't overlap. First,
- gimple registers don't have their addresses taken. Now, there
- could be more than one stack slot for (different versions of) the
- same gimple register, but we can presumably tell they don't
- overlap based on offsets from stack base addresses elsewhere.
- It's important that we don't proceed to DECL_RTL, because gimple
- registers may not pass DECL_RTL_SET_P, and make_decl_rtl won't be
- able to do anything about them since no SSA information will have
- remained to guide it. */
- if (is_gimple_reg (exprx) || is_gimple_reg (expry))
- return exprx != expry;
-
/* With invalid code we can end up storing into the constant pool.
Bail out to avoid ICEing when creating RTL for this.
See gfortran.dg/lto/20091028-2_0.f90. */
#define SSAVAR(x) (TREE_CODE (x) == SSA_NAME ? SSA_NAME_VAR (x) : x)
-/* Choose either CUR or NEXT as the leader DECL for a partition.
- Prefer ignored decls, to simplify debug dumps and reduce ambiguity
- out of the same user variable being in multiple partitions (this is
- less likely for compiler-introduced temps). */
-
-static tree
-leader_merge (tree cur, tree next)
-{
- if (cur == NULL || cur == next)
- return next;
-
- if (DECL_P (cur) && DECL_IGNORED_P (cur))
- return cur;
-
- if (DECL_P (next) && DECL_IGNORED_P (next))
- return next;
-
- return cur;
-}
-
-
-/* Return the RTL for the default SSA def of a PARM or RESULT, if
- there is one. */
-
-rtx
-get_rtl_for_parm_ssa_default_def (tree var)
-{
- gcc_assert (TREE_CODE (var) == PARM_DECL || TREE_CODE (var) == RESULT_DECL);
-
- if (!is_gimple_reg (var))
- return NULL_RTX;
-
- /* If we've already determined RTL for the decl, use it. This is
- not just an optimization: if VAR is a PARM whose incoming value
- is unused, we won't find a default def to use its partition, but
- we still want to use the location of the parm, if it was used at
- all. During assign_parms, until a location is assigned for the
- VAR, RTL can only for a parm or result if we're not coalescing
- across variables, when we know we're coalescing all SSA_NAMEs of
- each parm or result, and we're not coalescing them with names
- pertaining to other variables, such as other parms' default
- defs. */
- if (DECL_RTL_SET_P (var))
- {
- gcc_assert (DECL_RTL (var) != pc_rtx);
- return DECL_RTL (var);
- }
-
- tree name = ssa_default_def (cfun, var);
-
- if (!name)
- return NULL_RTX;
-
- int part = var_to_partition (SA.map, name);
- if (part == NO_PARTITION)
- return NULL_RTX;
-
- return SA.partition_to_pseudo[part];
-}
-
/* Associate declaration T with storage space X. If T is no
SSA name this is exactly SET_DECL_RTL, otherwise make the
partition of T associated with X. */
static inline void
set_rtl (tree t, rtx x)
{
- if (x && SSAVAR (t))
- {
- bool skip = false;
- tree cur = NULL_TREE;
-
- if (MEM_P (x))
- cur = MEM_EXPR (x);
- else if (REG_P (x))
- cur = REG_EXPR (x);
- else if (GET_CODE (x) == CONCAT
- && REG_P (XEXP (x, 0)))
- cur = REG_EXPR (XEXP (x, 0));
- else if (GET_CODE (x) == PARALLEL)
- cur = REG_EXPR (XVECEXP (x, 0, 0));
- else if (x == pc_rtx)
- skip = true;
- else
- gcc_unreachable ();
-
- tree next = skip ? cur : leader_merge (cur, SSAVAR (t));
-
- if (cur != next)
- {
- if (MEM_P (x))
- set_mem_attributes (x, next, true);
- else
- set_reg_attrs_for_decl_rtl (next, x);
- }
- }
-
if (TREE_CODE (t) == SSA_NAME)
{
- int part = var_to_partition (SA.map, t);
- if (part != NO_PARTITION)
- {
- if (SA.partition_to_pseudo[part])
- gcc_assert (SA.partition_to_pseudo[part] == x);
- else
- SA.partition_to_pseudo[part] = x;
- }
- /* For the benefit of debug information at -O0 (where
- vartracking doesn't run) record the place also in the base
- DECL. For PARMs and RESULTs, we may end up resetting these
- in function.c:maybe_reset_rtl_for_parm, but in some rare
- cases we may need them (unused and overwritten incoming
- value, that at -O0 must share the location with the other
- uses in spite of the missing default def), and this may be
- the only chance to preserve them. */
- if (x && x != pc_rtx && SSA_NAME_VAR (t))
+ SA.partition_to_pseudo[var_to_partition (SA.map, t)] = x;
+ if (x && !MEM_P (x))
+ set_reg_attrs_for_decl_rtl (SSA_NAME_VAR (t), x);
+ /* For the benefit of debug information at -O0 (where vartracking
+ doesn't run) record the place also in the base DECL if it's
+ a normal variable (not a parameter). */
+ if (x && x != pc_rtx && TREE_CODE (SSA_NAME_VAR (t)) == VAR_DECL)
{
tree var = SSA_NAME_VAR (t);
/* If we don't yet have something recorded, just record it now. */
gcc_assert (offset == trunc_int_for_mode (offset, Pmode));
x = plus_constant (Pmode, base, offset);
- x = gen_rtx_MEM (TREE_CODE (decl) == SSA_NAME
- ? TYPE_MODE (TREE_TYPE (decl))
- : DECL_MODE (SSAVAR (decl)), x);
+ x = gen_rtx_MEM (DECL_MODE (SSAVAR (decl)), x);
if (TREE_CODE (decl) != SSA_NAME)
{
DECL_USER_ALIGN (decl) = 0;
}
+ set_mem_attributes (x, SSAVAR (decl), true);
set_rtl (decl, x);
}
to a variable to be allocated in the stack frame. */
static void
-expand_one_stack_var_1 (tree var)
+expand_one_stack_var (tree var)
{
HOST_WIDE_INT size, offset;
unsigned byte_align;
- if (TREE_CODE (var) == SSA_NAME)
- {
- tree type = TREE_TYPE (var);
- size = tree_to_uhwi (TYPE_SIZE_UNIT (type));
- byte_align = TYPE_ALIGN_UNIT (type);
- }
- else
- {
- size = tree_to_uhwi (DECL_SIZE_UNIT (var));
- byte_align = align_local_variable (var);
- }
+ size = tree_to_uhwi (DECL_SIZE_UNIT (SSAVAR (var)));
+ byte_align = align_local_variable (SSAVAR (var));
/* We handle highly aligned variables in expand_stack_vars. */
gcc_assert (byte_align * BITS_PER_UNIT <= MAX_SUPPORTED_STACK_ALIGNMENT);
crtl->max_used_stack_slot_alignment, offset);
}
-/* Wrapper for expand_one_stack_var_1 that checks SSA_NAMEs are
- already assigned some MEM. */
-
-static void
-expand_one_stack_var (tree var)
-{
- if (TREE_CODE (var) == SSA_NAME)
- {
- int part = var_to_partition (SA.map, var);
- if (part != NO_PARTITION)
- {
- rtx x = SA.partition_to_pseudo[part];
- gcc_assert (x);
- gcc_assert (MEM_P (x));
- return;
- }
- }
-
- return expand_one_stack_var_1 (var);
-}
-
/* A subroutine of expand_one_var. Called to assign rtl to a VAR_DECL
that will reside in a hard register. */
rest_of_decl_compilation (var, 0, 0);
}
-/* Record the alignment requirements of some variable assigned to a
- pseudo. */
-
-static void
-record_alignment_for_reg_var (unsigned int align)
-{
- if (SUPPORTS_STACK_ALIGNMENT
- && crtl->stack_alignment_estimated < align)
- {
- /* stack_alignment_estimated shouldn't change after stack
- realign decision made */
- gcc_assert (!crtl->stack_realign_processed);
- crtl->stack_alignment_estimated = align;
- }
-
- /* stack_alignment_needed > PREFERRED_STACK_BOUNDARY is permitted.
- So here we only make sure stack_alignment_needed >= align. */
- if (crtl->stack_alignment_needed < align)
- crtl->stack_alignment_needed = align;
- if (crtl->max_used_stack_slot_alignment < align)
- crtl->max_used_stack_slot_alignment = align;
-}
-
-/* Create RTL for an SSA partition. */
-
-static void
-expand_one_ssa_partition (tree var)
-{
- int part = var_to_partition (SA.map, var);
- gcc_assert (part != NO_PARTITION);
-
- if (SA.partition_to_pseudo[part])
- return;
-
- if (!use_register_for_decl (var))
- {
- expand_one_stack_var_1 (var);
- return;
- }
-
- unsigned int align = MINIMUM_ALIGNMENT (TREE_TYPE (var),
- TYPE_MODE (TREE_TYPE (var)),
- TYPE_ALIGN (TREE_TYPE (var)));
-
- /* If the variable alignment is very large we'll dynamicaly allocate
- it, which means that in-frame portion is just a pointer. */
- if (align > MAX_SUPPORTED_STACK_ALIGNMENT)
- align = POINTER_SIZE;
-
- record_alignment_for_reg_var (align);
-
- machine_mode reg_mode = promote_ssa_mode (var, NULL);
-
- rtx x = gen_reg_rtx (reg_mode);
-
- set_rtl (var, x);
-}
-
-/* Record the association between the RTL generated for a partition
- and the underlying variable of the SSA_NAME. */
-
-static void
-adjust_one_expanded_partition_var (tree var)
-{
- if (!var)
- return;
-
- tree decl = SSA_NAME_VAR (var);
-
- int part = var_to_partition (SA.map, var);
- if (part == NO_PARTITION)
- return;
-
- rtx x = SA.partition_to_pseudo[part];
-
- set_rtl (var, x);
-
- if (!REG_P (x))
- return;
-
- /* Note if the object is a user variable. */
- if (decl && !DECL_ARTIFICIAL (decl))
- mark_user_reg (x);
-
- if (POINTER_TYPE_P (decl ? TREE_TYPE (decl) : TREE_TYPE (var)))
- mark_reg_pointer (x, get_pointer_alignment (var));
-}
-
/* A subroutine of expand_one_var. Called to assign rtl to a VAR_DECL
that will reside in a pseudo register. */
static void
expand_one_register_var (tree var)
{
- if (TREE_CODE (var) == SSA_NAME)
- {
- int part = var_to_partition (SA.map, var);
- if (part != NO_PARTITION)
- {
- rtx x = SA.partition_to_pseudo[part];
- gcc_assert (x);
- gcc_assert (REG_P (x));
- return;
- }
- gcc_unreachable ();
- }
-
- tree decl = var;
+ tree decl = SSAVAR (var);
tree type = TREE_TYPE (decl);
machine_mode reg_mode = promote_decl_mode (decl, NULL);
rtx x = gen_reg_rtx (reg_mode);
align = POINTER_SIZE;
}
- record_alignment_for_reg_var (align);
+ if (SUPPORTS_STACK_ALIGNMENT
+ && crtl->stack_alignment_estimated < align)
+ {
+ /* stack_alignment_estimated shouldn't change after stack
+ realign decision made */
+ gcc_assert (!crtl->stack_realign_processed);
+ crtl->stack_alignment_estimated = align;
+ }
+
+ /* stack_alignment_needed > PREFERRED_STACK_BOUNDARY is permitted.
+ So here we only make sure stack_alignment_needed >= align. */
+ if (crtl->stack_alignment_needed < align)
+ crtl->stack_alignment_needed = align;
+ if (crtl->max_used_stack_slot_alignment < align)
+ crtl->max_used_stack_slot_alignment = align;
if (TREE_CODE (origvar) == SSA_NAME)
{
if (targetm.use_pseudo_pic_reg ())
pic_offset_table_rtx = gen_reg_rtx (Pmode);
+ hash_map<tree, tree> ssa_name_decls;
for (i = 0; i < SA.map->num_partitions; i++)
{
tree var = partition_to_var (SA.map, i);
gcc_assert (!virtual_operand_p (var));
- expand_one_ssa_partition (var);
- }
+ /* Assign decls to each SSA name partition, share decls for partitions
+ we could have coalesced (those with the same type). */
+ if (SSA_NAME_VAR (var) == NULL_TREE)
+ {
+ tree *slot = &ssa_name_decls.get_or_insert (TREE_TYPE (var));
+ if (!*slot)
+ *slot = create_tmp_reg (TREE_TYPE (var));
+ replace_ssa_name_symbol (var, *slot);
+ }
- for (i = 1; i < num_ssa_names; i++)
- adjust_one_expanded_partition_var (ssa_name (i));
+ /* Always allocate space for partitions based on VAR_DECLs. But for
+ those based on PARM_DECLs or RESULT_DECLs and which matter for the
+ debug info, there is no need to do so if optimization is disabled
+ because all the SSA_NAMEs based on these DECLs have been coalesced
+ into a single partition, which is thus assigned the canonical RTL
+ location of the DECLs. If in_lto_p, we can't rely on optimize,
+ a function could be compiled with -O1 -flto first and only the
+ link performed at -O0. */
+ if (TREE_CODE (SSA_NAME_VAR (var)) == VAR_DECL)
+ expand_one_var (var, true, true);
+ else if (DECL_IGNORED_P (SSA_NAME_VAR (var)) || optimize || in_lto_p)
+ {
+ /* This is a PARM_DECL or RESULT_DECL. For those partitions that
+ contain the default def (representing the parm or result itself)
+ we don't do anything here. But those which don't contain the
+ default def (representing a temporary based on the parm/result)
+ we need to allocate space just like for normal VAR_DECLs. */
+ if (!bitmap_bit_p (SA.partition_has_default_def, i))
+ {
+ expand_one_var (var, true, true);
+ gcc_assert (SA.partition_to_pseudo[i]);
+ }
+ }
+ }
if (flag_stack_protect == SPCT_FLAG_STRONG)
gen_stack_protect_signal
parm_birth_insn = var_seq;
}
+ /* Now that we also have the parameter RTXs, copy them over to our
+ partitions. */
+ for (i = 0; i < SA.map->num_partitions; i++)
+ {
+ tree var = SSA_NAME_VAR (partition_to_var (SA.map, i));
+
+ if (TREE_CODE (var) != VAR_DECL
+ && !SA.partition_to_pseudo[i])
+ SA.partition_to_pseudo[i] = DECL_RTL_IF_SET (var);
+ gcc_assert (SA.partition_to_pseudo[i]);
+
+ /* If this decl was marked as living in multiple places, reset
+ this now to NULL. */
+ if (DECL_RTL_IF_SET (var) == pc_rtx)
+ SET_DECL_RTL (var, NULL);
+
+ /* Some RTL parts really want to look at DECL_RTL(x) when x
+ was a decl marked in REG_ATTR or MEM_ATTR. We could use
+ SET_DECL_RTL here making this available, but that would mean
+ to select one of the potentially many RTLs for one DECL. Instead
+ of doing that we simply reset the MEM_EXPR of the RTL in question,
+ then nobody can get at it and hence nobody can call DECL_RTL on it. */
+ if (!DECL_RTL_SET_P (var))
+ {
+ if (MEM_P (SA.partition_to_pseudo[i]))
+ set_mem_expr (SA.partition_to_pseudo[i], NULL);
+ }
+ }
+
/* If we have a class containing differently aligned pointers
we need to merge those into the corresponding RTL pointer
alignment. */
{
tree name = ssa_name (i);
int part;
+ rtx r;
if (!name
/* We might have generated new SSA names in
if (part == NO_PARTITION)
continue;
- gcc_assert (SA.partition_to_pseudo[part]);
-
- /* If this decl was marked as living in multiple places, reset
- this now to NULL. */
- tree var = SSA_NAME_VAR (name);
- if (var && DECL_RTL_IF_SET (var) == pc_rtx)
- SET_DECL_RTL (var, NULL);
- /* Check that the pseudos chosen by assign_parms are those of
- the corresponding default defs. */
- else if (SSA_NAME_IS_DEFAULT_DEF (name)
- && (TREE_CODE (var) == PARM_DECL
- || TREE_CODE (var) == RESULT_DECL))
+ /* Adjust all partition members to get the underlying decl of
+ the representative which we might have created in expand_one_var. */
+ if (SSA_NAME_VAR (name) == NULL_TREE)
{
- rtx in = DECL_RTL_IF_SET (var);
- gcc_assert (in);
- rtx out = SA.partition_to_pseudo[part];
- gcc_assert (in == out || rtx_equal_p (in, out));
+ tree leader = partition_to_var (SA.map, part);
+ gcc_assert (SSA_NAME_VAR (leader) != NULL_TREE);
+ replace_ssa_name_symbol (name, SSA_NAME_VAR (leader));
}
+ if (!POINTER_TYPE_P (TREE_TYPE (name)))
+ continue;
+
+ r = SA.partition_to_pseudo[part];
+ if (REG_P (r))
+ mark_reg_pointer (r, get_pointer_alignment (name));
}
/* If this function is `main', emit a call to `__main'
extern tree gimple_assign_rhs_to_tree (gimple);
extern HOST_WIDE_INT estimated_stack_frame_size (struct cgraph_node *);
-extern rtx get_rtl_for_parm_ssa_default_def (tree var);
-
#endif /* GCC_CFGEXPAND_H */
Enable loop header copying on trees
ftree-coalesce-inlined-vars
-Common Ignore RejectNegative
-Does nothing. Preserved for backward compatibility.
+Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
+Enable coalescing of copy-related user variables that are inlined
ftree-coalesce-vars
-Common Report Var(flag_tree_coalesce_vars) Optimization
-Enable SSA coalescing of user variables
+Common Report Var(flag_ssa_coalesce_vars,2) Optimization
+Enable coalescing of all copy-related user variables
ftree-copyrename
-Common Ignore
-Does nothing. Preserved for backward compatibility.
+Common Report Var(flag_tree_copyrename) Optimization
+Replace SSA temporaries with better names in copies
ftree-copy-prop
Common Report Var(flag_tree_copy_prop) Optimization
-fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
-fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-copyrename@r{[}-@var{n}@r{]} @gol
-fdump-tree-nrv -fdump-tree-vect @gol
-fdump-tree-sink @gol
-fdump-tree-sra@r{[}-@var{n}@r{]} @gol
-fstack-protector-explicit -fstdarg-opt -fstrict-aliasing @gol
-fstrict-overflow -fthread-jumps -ftracer -ftree-bit-ccp @gol
-ftree-builtin-call-dce -ftree-ccp -ftree-ch @gol
--ftree-coalesce-vars -ftree-copy-prop -ftree-dce -ftree-dominator-opts @gol
--ftree-dse -ftree-forwprop -ftree-fre -ftree-loop-if-convert @gol
+-ftree-coalesce-inline-vars -ftree-coalesce-vars -ftree-copy-prop @gol
+-ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse @gol
+-ftree-forwprop -ftree-fre -ftree-loop-if-convert @gol
-ftree-loop-if-convert-stores -ftree-loop-im @gol
-ftree-phiprop -ftree-loop-distribution -ftree-loop-distribute-patterns @gol
-ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize @gol
Dump each function after forward propagating single use variables. The file
name is made by appending @file{.forwprop} to the source file name.
+@item copyrename
+@opindex fdump-tree-copyrename
+Dump each function after applying the copy rename optimization. The file
+name is made by appending @file{.copyrename} to the source file name.
+
@item nrv
@opindex fdump-tree-nrv
Dump each function after applying the named return value optimization on
-ftree-ccp @gol
-fssa-phiopt @gol
-ftree-ch @gol
--ftree-coalesce-vars @gol
-ftree-copy-prop @gol
+-ftree-copyrename @gol
-ftree-dce @gol
-ftree-dominator-opts @gol
-ftree-dse @gol
Compare the results of several data dependence analyzers. This option
is used for debugging the data dependence analyzers.
-@item -ftree-coalesce-vars
-@opindex ftree-coalesce-vars
-Tell the compiler to attempt to combine small user-defined variables
-too, instead of just compiler temporaries. This may severely limit the
-ability to debug an optimized program compiled with
-@option{-fno-var-tracking-assignments}. In the negated form, this flag
-prevents SSA coalescing of user variables. This option is enabled by
-default if optimization is enabled.
-
@item -ftree-loop-if-convert
@opindex ftree-loop-if-convert
Attempt to transform conditional jumps in the innermost loops to
references with scalars to prevent committing structures to memory too
early. This flag is enabled by default at @option{-O} and higher.
+@item -ftree-copyrename
+@opindex ftree-copyrename
+Perform copy renaming on trees. This pass attempts to rename compiler
+temporaries to other variables at copy locations, usually resulting in
+variable names which more closely resemble the original variables. This flag
+is enabled by default at @option{-O} and higher.
+
+@item -ftree-coalesce-inlined-vars
+@opindex ftree-coalesce-inlined-vars
+Tell the copyrename pass (see @option{-ftree-copyrename}) to attempt to
+combine small user-defined variables too, but only if they are inlined
+from other functions. It is a more limited form of
+@option{-ftree-coalesce-vars}. This may harm debug information of such
+inlined variables, but it keeps variables of the inlined-into
+function apart from each other, such that they are more likely to
+contain the expected values in a debugging session.
+
+@item -ftree-coalesce-vars
+@opindex ftree-coalesce-vars
+Tell the copyrename pass (see @option{-ftree-copyrename}) to attempt to
+combine small user-defined variables too, instead of just compiler
+temporaries. This may severely limit the ability to debug an optimized
+program compiled with @option{-fno-var-tracking-assignments}. In the
+negated form, this flag prevents SSA coalescing of user variables,
+including inlined ones. This option is enabled by default.
+
@item -ftree-ter
@opindex ftree-ter
Perform temporary expression replacement during the SSA->normal phase. Single
void
set_reg_attrs_for_decl_rtl (tree t, rtx x)
{
- if (!t)
- return;
- tree tdecl = t;
if (GET_CODE (x) == SUBREG)
{
gcc_assert (subreg_lowpart_p (x));
if (REG_P (x))
REG_ATTRS (x)
= get_reg_attrs (t, byte_lowpart_offset (GET_MODE (x),
- DECL_MODE (tdecl)));
+ DECL_MODE (t)));
if (GET_CODE (x) == CONCAT)
{
if (REG_P (XEXP (x, 0)))
return pmode;
}
-/* Return the promoted mode for name. If it is a named SSA_NAME, it
- is the same as promote_decl_mode. Otherwise, it is the promoted
- mode of a temp decl of same type as the SSA_NAME, if we had created
- one. */
-
-machine_mode
-promote_ssa_mode (const_tree name, int *punsignedp)
-{
- gcc_assert (TREE_CODE (name) == SSA_NAME);
-
- tree type = TREE_TYPE (name);
- int unsignedp = TYPE_UNSIGNED (type);
- machine_mode mode = TYPE_MODE (type);
-
- machine_mode pmode = promote_mode (type, mode, &unsignedp);
- if (punsignedp)
- *punsignedp = unsignedp;
-
- return pmode;
-}
-
-
\f
/* Controls the behaviour of {anti_,}adjust_stack. */
static bool suppress_reg_args_size;
/* Return mode and signedness to use when object is promoted. */
machine_mode promote_decl_mode (const_tree, int *);
-/* Return mode and signedness to use when object is promoted. */
-machine_mode promote_ssa_mode (const_tree, int *);
-
/* Remove some bytes from the stack. An rtx says how many. */
extern void adjust_stack (rtx);
rtx op0, op1, temp, decl_rtl;
tree type;
int unsignedp;
- machine_mode mode, dmode;
+ machine_mode mode;
enum tree_code code = TREE_CODE (exp);
rtx subtarget, original_target;
int ignore;
if (g == NULL
&& modifier == EXPAND_INITIALIZER
&& !SSA_NAME_IS_DEFAULT_DEF (exp)
- && (optimize || !SSA_NAME_VAR (exp)
- || DECL_IGNORED_P (SSA_NAME_VAR (exp)))
+ && (optimize || DECL_IGNORED_P (SSA_NAME_VAR (exp)))
&& stmt_is_replaceable_p (SSA_NAME_DEF_STMT (exp)))
g = SSA_NAME_DEF_STMT (exp);
if (g)
/* Ensure variable marked as used even if it doesn't go through
a parser. If it hasn't be used yet, write out an external
definition. */
- if (exp)
- TREE_USED (exp) = 1;
+ TREE_USED (exp) = 1;
/* Show we haven't gotten RTL for this yet. */
temp = 0;
/* Variables inherited from containing functions should have
been lowered by this point. */
- if (exp)
- context = decl_function_context (exp);
- gcc_assert (!exp
- || SCOPE_FILE_SCOPE_P (context)
+ context = decl_function_context (exp);
+ gcc_assert (SCOPE_FILE_SCOPE_P (context)
|| context == current_function_decl
|| TREE_STATIC (exp)
|| DECL_EXTERNAL (exp)
decl_rtl = use_anchored_address (decl_rtl);
if (modifier != EXPAND_CONST_ADDRESS
&& modifier != EXPAND_SUM
- && !memory_address_addr_space_p (exp ? DECL_MODE (exp)
- : GET_MODE (decl_rtl),
+ && !memory_address_addr_space_p (DECL_MODE (exp),
XEXP (decl_rtl, 0),
MEM_ADDR_SPACE (decl_rtl)))
temp = replace_equiv_address (decl_rtl,
if the address is a register. */
if (temp != 0)
{
- if (exp && MEM_P (temp) && REG_P (XEXP (temp, 0)))
+ if (MEM_P (temp) && REG_P (XEXP (temp, 0)))
mark_reg_pointer (XEXP (temp, 0), DECL_ALIGN (exp));
return temp;
}
- if (exp)
- dmode = DECL_MODE (exp);
- else
- dmode = TYPE_MODE (TREE_TYPE (ssa_name));
-
/* If the mode of DECL_RTL does not match that of the decl,
there are two cases: we are dealing with a BLKmode value
that is returned in a register, or we are dealing with
of the wanted mode, but mark it so that we know that it
was already extended. */
if (REG_P (decl_rtl)
- && dmode != BLKmode
- && GET_MODE (decl_rtl) != dmode)
+ && DECL_MODE (exp) != BLKmode
+ && GET_MODE (decl_rtl) != DECL_MODE (exp))
{
machine_mode pmode;
/* Get the signedness to be used for this variable. Ensure we get
the same mode we got when the variable was declared. */
- if (code != SSA_NAME)
- pmode = promote_decl_mode (exp, &unsignedp);
- else if ((g = SSA_NAME_DEF_STMT (ssa_name))
- && gimple_code (g) == GIMPLE_CALL
- && !gimple_call_internal_p (g))
+ if (code == SSA_NAME
+ && (g = SSA_NAME_DEF_STMT (ssa_name))
+ && gimple_code (g) == GIMPLE_CALL
+ && !gimple_call_internal_p (g))
pmode = promote_function_mode (type, mode, &unsignedp,
gimple_call_fntype (g),
2);
else
- pmode = promote_ssa_mode (ssa_name, &unsignedp);
+ pmode = promote_decl_mode (exp, &unsignedp);
gcc_assert (GET_MODE (decl_rtl) == pmode);
temp = gen_lowpart_SUBREG (mode, decl_rtl);
#include "cfganal.h"
#include "cfgbuild.h"
#include "cfgcleanup.h"
-#include "cfgexpand.h"
#include "basic-block.h"
#include "df.h"
#include "params.h"
bool
use_register_for_decl (const_tree decl)
{
- if (TREE_CODE (decl) == SSA_NAME)
- {
- /* We often try to use the SSA_NAME, instead of its underlying
- decl, to get type information and guide decisions, to avoid
- differences of behavior between anonymous and named
- variables, but in this one case we have to go for the actual
- variable if there is one. The main reason is that, at least
- at -O0, we want to place user variables on the stack, but we
- don't mind using pseudos for anonymous or ignored temps.
- Should we take the SSA_NAME, we'd conclude all SSA_NAMEs
- should go in pseudos, whereas their corresponding variables
- might have to go on the stack. So, disregarding the decl
- here would negatively impact debug info at -O0, enable
- coalescing between SSA_NAMEs that ought to get different
- stack/pseudo assignments, and get the incoming argument
- processing thoroughly confused by PARM_DECLs expected to live
- in stack slots but assigned to pseudos. */
- if (!SSA_NAME_VAR (decl))
- return TYPE_MODE (TREE_TYPE (decl)) != BLKmode
- && !(flag_float_store && FLOAT_TYPE_P (TREE_TYPE (decl)));
-
- decl = SSA_NAME_VAR (decl);
- }
-
if (!targetm.calls.allocate_stack_slots_for_args ())
return true;
data->entry_parm = entry_parm;
}
-/* Wrapper for use_register_for_decl, that special-cases the
- .result_ptr as the function's RESULT_DECL when the RESULT_DECL is
- passed by reference. */
-
-static bool
-use_register_for_parm_decl (struct assign_parm_data_all *all, tree parm)
-{
- if (parm == all->function_result_decl)
- {
- tree result = DECL_RESULT (current_function_decl);
-
- if (DECL_BY_REFERENCE (result))
- parm = result;
- }
-
- return use_register_for_decl (parm);
-}
-
-/* Wrapper for get_rtl_for_parm_ssa_default_def, that special-cases
- the .result_ptr as the function's RESULT_DECL when the RESULT_DECL
- is passed by reference. */
-
-static rtx
-rtl_for_parm (struct assign_parm_data_all *all, tree parm)
-{
- if (parm == all->function_result_decl)
- {
- tree result = DECL_RESULT (current_function_decl);
-
- if (!DECL_BY_REFERENCE (result))
- return NULL_RTX;
-
- parm = result;
- }
-
- return get_rtl_for_parm_ssa_default_def (parm);
-}
-
-/* Reset the location of PARM_DECLs and RESULT_DECLs that had
- SSA_NAMEs in multiple partitions, so that assign_parms will choose
- the default def, if it exists, or create new RTL to hold the unused
- entry value. If we are coalescing across variables, we want to
- reset the location too, because a parm without a default def
- (incoming value unused) might be coalesced with one with a default
- def, and then assign_parms would copy both incoming values to the
- same location, which might cause the wrong value to survive. */
-static void
-maybe_reset_rtl_for_parm (tree parm)
-{
- gcc_assert (TREE_CODE (parm) == PARM_DECL
- || TREE_CODE (parm) == RESULT_DECL);
- if ((flag_tree_coalesce_vars
- || (DECL_RTL_SET_P (parm) && DECL_RTL (parm) == pc_rtx))
- && is_gimple_reg (parm))
- SET_DECL_RTL (parm, NULL_RTX);
-}
-
/* A subroutine of assign_parms. Adjust DATA->STACK_RTL such that it's
always valid and properly aligned. */
static void
-assign_parm_adjust_stack_rtl (struct assign_parm_data_all *all, tree parm,
- struct assign_parm_data_one *data)
+assign_parm_adjust_stack_rtl (struct assign_parm_data_one *data)
{
rtx stack_parm = data->stack_parm;
- /* If out-of-SSA assigned RTL to the parm default def, make sure we
- don't use what we might have computed before. */
- rtx ssa_assigned = rtl_for_parm (all, parm);
- if (ssa_assigned)
- stack_parm = NULL;
-
/* If we can't trust the parm stack slot to be aligned enough for its
ultimate type, don't use that slot after entry. We'll make another
stack slot, if we need one. */
- else if (stack_parm
- && ((STRICT_ALIGNMENT
- && (GET_MODE_ALIGNMENT (data->nominal_mode)
- > MEM_ALIGN (stack_parm)))
- || (data->nominal_type
- && TYPE_ALIGN (data->nominal_type) > MEM_ALIGN (stack_parm)
- && MEM_ALIGN (stack_parm) < PREFERRED_STACK_BOUNDARY)))
+ if (stack_parm
+ && ((STRICT_ALIGNMENT
+ && GET_MODE_ALIGNMENT (data->nominal_mode) > MEM_ALIGN (stack_parm))
+ || (data->nominal_type
+ && TYPE_ALIGN (data->nominal_type) > MEM_ALIGN (stack_parm)
+ && MEM_ALIGN (stack_parm) < PREFERRED_STACK_BOUNDARY)))
stack_parm = NULL;
/* If parm was passed in memory, and we need to convert it on entry,
size = int_size_in_bytes (data->passed_type);
size_stored = CEIL_ROUND (size, UNITS_PER_WORD);
-
if (stack_parm == 0)
{
DECL_ALIGN (parm) = MAX (DECL_ALIGN (parm), BITS_PER_WORD);
- stack_parm = rtl_for_parm (all, parm);
- if (!stack_parm)
- stack_parm = assign_stack_local (BLKmode, size_stored,
- DECL_ALIGN (parm));
- else
- stack_parm = copy_rtx (stack_parm);
+ stack_parm = assign_stack_local (BLKmode, size_stored,
+ DECL_ALIGN (parm));
if (GET_MODE_SIZE (GET_MODE (entry_parm)) == size)
PUT_MODE (stack_parm, GET_MODE (entry_parm));
set_mem_attributes (stack_parm, parm, 1);
= promote_function_mode (data->nominal_type, data->nominal_mode, &unsignedp,
TREE_TYPE (current_function_decl), 2);
- rtx from_expand = rtl_for_parm (all, parm);
+ parmreg = gen_reg_rtx (promoted_nominal_mode);
- if (from_expand && !data->passed_pointer)
- {
- parmreg = from_expand;
- gcc_assert (GET_MODE (parmreg) == promoted_nominal_mode);
- }
- else
- {
- parmreg = gen_reg_rtx (promoted_nominal_mode);
- if (!DECL_ARTIFICIAL (parm))
- mark_user_reg (parmreg);
- }
+ if (!DECL_ARTIFICIAL (parm))
+ mark_user_reg (parmreg);
/* If this was an item that we received a pointer to,
set DECL_RTL appropriately. */
assign_parm_find_data_types and expand_expr_real_1. */
equiv_stack_parm = data->stack_parm;
- if (!equiv_stack_parm)
- equiv_stack_parm = data->entry_parm;
validated_mem = validize_mem (copy_rtx (data->entry_parm));
need_conversion = (data->nominal_mode != data->passed_mode
/* If we were passed a pointer but the actual value can safely live
in a register, retrieve it and use it directly. */
- if (data->passed_pointer
- && (from_expand || TYPE_MODE (TREE_TYPE (parm)) != BLKmode))
+ if (data->passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode)
{
/* We can't use nominal_mode, because it will have been set to
Pmode above. We must use the actual mode of the parm. */
- if (from_expand)
- {
- parmreg = from_expand;
- gcc_assert (GET_MODE (parmreg) == TYPE_MODE (TREE_TYPE (parm)));
- }
- else if (use_register_for_decl (parm))
+ if (use_register_for_decl (parm))
{
parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm)));
mark_user_reg (parmreg);
/* STACK_PARM is the pointer, not the parm, and PARMREG is
now the parm. */
- data->stack_parm = equiv_stack_parm = NULL;
+ data->stack_parm = NULL;
}
/* Mark the register as eliminable if we did no conversion and it was
make here would screw up life analysis for it. */
if (data->nominal_mode == data->passed_mode
&& !did_conversion
- && equiv_stack_parm != 0
- && MEM_P (equiv_stack_parm)
+ && data->stack_parm != 0
+ && MEM_P (data->stack_parm)
&& data->locate.offset.var == 0
&& reg_mentioned_p (virtual_incoming_args_rtx,
- XEXP (equiv_stack_parm, 0)))
+ XEXP (data->stack_parm, 0)))
{
rtx_insn *linsn = get_last_insn ();
rtx_insn *sinsn;
= GET_MODE_INNER (GET_MODE (parmreg));
int regnor = REGNO (XEXP (parmreg, 0));
int regnoi = REGNO (XEXP (parmreg, 1));
- rtx stackr = adjust_address_nv (equiv_stack_parm, submode, 0);
- rtx stacki = adjust_address_nv (equiv_stack_parm, submode,
+ rtx stackr = adjust_address_nv (data->stack_parm, submode, 0);
+ rtx stacki = adjust_address_nv (data->stack_parm, submode,
GET_MODE_SIZE (submode));
/* Scan backwards for the set of the real and
{
rtx src, dest;
- if (data->stack_parm == 0)
- {
- rtx x = data->stack_parm = rtl_for_parm (all, parm);
- if (x)
- gcc_assert (GET_MODE (x) == GET_MODE (data->entry_parm));
- }
-
if (data->stack_parm == 0)
{
int align = STACK_SLOT_ALIGNMENT (data->passed_type,
DECL_INCOMING_RTL (parm) = DECL_RTL (parm);
continue;
}
- else
- maybe_reset_rtl_for_parm (parm);
/* Estimate stack alignment from parameter alignment. */
if (SUPPORTS_STACK_ALIGNMENT)
else
set_decl_incoming_rtl (parm, data.entry_parm, false);
- assign_parm_adjust_stack_rtl (&all, parm, &data);
-
- /* Bounds should be loaded in the particular order to
+ /* Boudns should be loaded in the particular order to
have registers allocated correctly. Collect info about
input bounds and load them later. */
if (POINTER_BOUNDS_TYPE_P (data.passed_type))
}
else
{
+ assign_parm_adjust_stack_rtl (&data);
+
if (assign_parm_setup_block_p (&data))
assign_parm_setup_block (&all, parm, &data);
- else if (data.passed_pointer
- || use_register_for_parm_decl (&all, parm))
+ else if (data.passed_pointer || use_register_for_decl (parm))
assign_parm_setup_reg (&all, parm, &data);
else
assign_parm_setup_stack (&all, parm, &data);
before any library calls that assign parms might generate. */
/* Decide whether to return the value in memory or in a register. */
- tree res = DECL_RESULT (subr);
- maybe_reset_rtl_for_parm (res);
- if (aggregate_value_p (res, subr))
+ if (aggregate_value_p (DECL_RESULT (subr), subr))
{
/* Returning something that won't go in a register. */
rtx value_address = 0;
#ifdef PCC_STATIC_STRUCT_RETURN
if (cfun->returns_pcc_struct)
{
- int size = int_size_in_bytes (TREE_TYPE (res));
+ int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr)));
value_address = assemble_static_space (size);
}
else
it. */
if (sv)
{
- if (DECL_BY_REFERENCE (res))
- value_address = get_rtl_for_parm_ssa_default_def (res);
- if (!value_address)
- value_address = gen_reg_rtx (Pmode);
+ value_address = gen_reg_rtx (Pmode);
emit_move_insn (value_address, sv);
}
}
if (value_address)
{
rtx x = value_address;
- if (!DECL_BY_REFERENCE (res))
+ if (!DECL_BY_REFERENCE (DECL_RESULT (subr)))
{
- x = get_rtl_for_parm_ssa_default_def (res);
- if (!x)
- {
- x = gen_rtx_MEM (DECL_MODE (res), value_address);
- set_mem_attributes (x, res, 1);
- }
+ x = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), x);
+ set_mem_attributes (x, DECL_RESULT (subr), 1);
}
- SET_DECL_RTL (res, x);
+ SET_DECL_RTL (DECL_RESULT (subr), x);
}
}
- else if (DECL_MODE (res) == VOIDmode)
+ else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode)
/* If return mode is void, this decl rtl should not be used. */
- SET_DECL_RTL (res, NULL_RTX);
+ SET_DECL_RTL (DECL_RESULT (subr), NULL_RTX);
else
{
/* Compute the return values into a pseudo reg, which we will copy
into the true return register after the cleanups are done. */
- tree return_type = TREE_TYPE (res);
- rtx x = get_rtl_for_parm_ssa_default_def (res);
- if (x)
- /* Use it. */;
- else if (TYPE_MODE (return_type) != BLKmode
- && targetm.calls.return_in_msb (return_type))
+ tree return_type = TREE_TYPE (DECL_RESULT (subr));
+ if (TYPE_MODE (return_type) != BLKmode
+ && targetm.calls.return_in_msb (return_type))
/* expand_function_end will insert the appropriate padding in
this case. Use the return value's natural (unpadded) mode
within the function proper. */
- x = gen_reg_rtx (TYPE_MODE (return_type));
+ SET_DECL_RTL (DECL_RESULT (subr),
+ gen_reg_rtx (TYPE_MODE (return_type)));
else
{
/* In order to figure out what mode to use for the pseudo, we
/* Structures that are returned in registers are not
aggregate_value_p, so we may see a PARALLEL or a REG. */
if (REG_P (hard_reg))
- x = gen_reg_rtx (GET_MODE (hard_reg));
+ SET_DECL_RTL (DECL_RESULT (subr),
+ gen_reg_rtx (GET_MODE (hard_reg)));
else
{
gcc_assert (GET_CODE (hard_reg) == PARALLEL);
- x = gen_group_rtx (hard_reg);
+ SET_DECL_RTL (DECL_RESULT (subr), gen_group_rtx (hard_reg));
}
}
- SET_DECL_RTL (res, x);
-
/* Set DECL_REGISTER flag so that expand_function_end will copy the
result to the real return register(s). */
- DECL_REGISTER (res) = 1;
+ DECL_REGISTER (DECL_RESULT (subr)) = 1;
if (chkp_function_instrumented_p (current_function_decl))
{
- tree return_type = TREE_TYPE (res);
+ tree return_type = TREE_TYPE (DECL_RESULT (subr));
rtx bounds = targetm.calls.chkp_function_value_bounds (return_type,
subr, 1);
- SET_DECL_BOUNDS_RTL (res, bounds);
+ SET_DECL_BOUNDS_RTL (DECL_RESULT (subr), bounds);
}
}
rtx local, chain;
rtx_insn *insn;
- local = get_rtl_for_parm_ssa_default_def (parm);
- if (!local)
- local = gen_reg_rtx (Pmode);
+ local = gen_reg_rtx (Pmode);
chain = targetm.calls.static_chain (current_function_decl, true);
set_decl_incoming_rtl (parm, chain, false);
return copy;
}
+/* Given SSA_NAMEs NAME1 and NAME2, return true if they are candidates for
+ coalescing together, false otherwise.
+
+ This must stay consistent with var_map_base_init in tree-ssa-live.c. */
+
+bool
+gimple_can_coalesce_p (tree name1, tree name2)
+{
+ /* First check the SSA_NAME's associated DECL. We only want to
+ coalesce if they have the same DECL or both have no associated DECL. */
+ tree var1 = SSA_NAME_VAR (name1);
+ tree var2 = SSA_NAME_VAR (name2);
+ var1 = (var1 && (!VAR_P (var1) || !DECL_IGNORED_P (var1))) ? var1 : NULL_TREE;
+ var2 = (var2 && (!VAR_P (var2) || !DECL_IGNORED_P (var2))) ? var2 : NULL_TREE;
+ if (var1 != var2)
+ return false;
+
+ /* Now check the types. If the types are the same, then we should
+ try to coalesce V1 and V2. */
+ tree t1 = TREE_TYPE (name1);
+ tree t2 = TREE_TYPE (name2);
+ if (t1 == t2)
+ return true;
+
+ /* If the types are not the same, check for a canonical type match. This
+ (for example) allows coalescing when the types are fundamentally the
+ same, but just have different names.
+
+ Note pointer types with different address spaces may have the same
+ canonical type. Those are rejected for coalescing by the
+ types_compatible_p check. */
+ if (TYPE_CANONICAL (t1)
+ && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
+ && types_compatible_p (t1, t2))
+ return true;
+
+ return false;
+}
+
/* Strip off a legitimate source ending from the input string NAME of
length LEN. Rather than having to know the names used by all of
our front ends, we strip off an ending of a period followed by
extern bool gimple_has_body_p (tree);
extern const char *gimple_decl_printable_name (tree, int);
extern tree copy_var_decl (tree, tree, tree);
+extern bool gimple_can_coalesce_p (tree, tree);
extern tree create_tmp_var_name (const char *);
extern tree create_tmp_var_raw (tree, const char * = NULL);
extern tree create_tmp_var (tree, const char * = NULL);
{ OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_bit_ccp, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_ftree_coalesce_vars, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_sra, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
NEXT_PASS (pass_all_early_optimizations);
PUSH_INSERT_PASSES_WITHIN (pass_all_early_optimizations)
NEXT_PASS (pass_remove_cgraph_callee_edges);
+ NEXT_PASS (pass_rename_ssa_copies);
NEXT_PASS (pass_object_sizes);
NEXT_PASS (pass_ccp);
/* After CCP we rewrite no longer addressed locals into SSA
/* Initial scalar cleanups before alias computation.
They ensure memory accesses are not indirect wherever possible. */
NEXT_PASS (pass_strip_predict_hints);
+ NEXT_PASS (pass_rename_ssa_copies);
NEXT_PASS (pass_ccp);
/* After CCP we rewrite no longer addressed locals into SSA
form if possible. */
NEXT_PASS (pass_ch);
NEXT_PASS (pass_lower_complex);
NEXT_PASS (pass_sra);
+ NEXT_PASS (pass_rename_ssa_copies);
/* The dom pass will also resolve all __builtin_constant_p calls
that are still there to 0. This has to be done after some
propagations have already run, but before some more dead code
NEXT_PASS (pass_fold_builtins);
NEXT_PASS (pass_optimize_widening_mul);
NEXT_PASS (pass_tail_calls);
+ NEXT_PASS (pass_rename_ssa_copies);
/* FIXME: If DCE is not run before checking for uninitialized uses,
we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
However, this also causes us to misdiagnose cases that should be
NEXT_PASS (pass_dce);
NEXT_PASS (pass_asan);
NEXT_PASS (pass_tsan);
+ NEXT_PASS (pass_rename_ssa_copies);
/* ??? We do want some kind of loop invariant motion, but we possibly
need to adjust LIM to be more friendly towards preserving accurate
debug information here. */
+2015-06-09 Alexandre Oliva <aoliva@redhat.com>
+
+ Revert:
+ 2015-06-09 Alexandre Oliva <aoliva@redhat.com>
+ * gcc.dg/guality/pr54200.c: Add -fno-tree-coalesce-vars.
+ * gcc.dg/ssp-1.c: Make counter a register.
+ * gcc.dg/ssp-2.c: Likewise.
+ * gcc.dg/torture/parm-coalesce.c: New.
+
2015-06-09 Tom de Vries <tom@codesourcery.com>
* gcc.target/i386/vararg-loc.c: New test.
/* PR tree-optimization/54200 */
/* { dg-do run } */
-/* { dg-options "-g -fno-var-tracking-assignments -fno-tree-coalesce-vars" } */
+/* { dg-options "-g -fno-var-tracking-assignments" } */
int o __attribute__((used));
int main ()
{
- register int i;
+ int i;
char foo[255];
// smash stack
void
overflow()
{
- register int i = 0;
+ int i = 0;
char foo[30];
/* Overflow buffer. */
+++ /dev/null
-/* { dg-do run } */
-
-#include <stdlib.h>
-
-/* Make sure we don't coalesce both incoming parms, one whose incoming
- value is unused, to the same location, so as to overwrite one of
- them with the incoming value of the other. */
-
-int __attribute__((noinline, noclone))
-foo (int i, int j)
-{
- j = i; /* The incoming value for J is unused. */
- i = 2;
- if (j)
- j++;
- j += i + 1;
- return j;
-}
-
-/* Same as foo, but with swapped parameters. */
-int __attribute__((noinline, noclone))
-bar (int j, int i)
-{
- j = i; /* The incoming value for J is unused. */
- i = 2;
- if (j)
- j++;
- j += i + 1;
- return j;
-}
-
-int
-main (void)
-{
- if (foo (0, 1) != 3)
- abort ();
- if (bar (1, 0) != 3)
- abort ();
- return 0;
-}
rtx dest_rtx, seq, x;
machine_mode dest_mode, src_mode;
int unsignedp;
+ tree var;
if (dump_file && (dump_flags & TDF_DETAILS))
{
start_sequence ();
- tree name = partition_to_var (SA.map, dest);
+ var = SSA_NAME_VAR (partition_to_var (SA.map, dest));
src_mode = TYPE_MODE (TREE_TYPE (src));
dest_mode = GET_MODE (dest_rtx);
- gcc_assert (src_mode == TYPE_MODE (TREE_TYPE (name)));
+ gcc_assert (src_mode == TYPE_MODE (TREE_TYPE (var)));
gcc_assert (!REG_P (dest_rtx)
- || dest_mode == promote_ssa_mode (name, &unsignedp));
+ || dest_mode == promote_decl_mode (var, &unsignedp));
if (src_mode != dest_mode)
{
static rtx
get_temp_reg (tree name)
{
- tree type = TREE_TYPE (name);
+ tree var = TREE_CODE (name) == SSA_NAME ? SSA_NAME_VAR (name) : name;
+ tree type = TREE_TYPE (var);
int unsignedp;
- machine_mode reg_mode = promote_ssa_mode (name, &unsignedp);
+ machine_mode reg_mode = promote_decl_mode (var, &unsignedp);
rtx x = gen_reg_rtx (reg_mode);
if (POINTER_TYPE_P (type))
- mark_reg_pointer (x, TYPE_ALIGN (TREE_TYPE (type)));
+ mark_reg_pointer (x, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (var))));
return x;
}
/* Return to viewing the variable list as just all reference variables after
coalescing has been performed. */
- partition_view_normal (map);
+ partition_view_normal (map, false);
if (dump_file && (dump_flags & TDF_DETAILS))
{
#include "tree-ssanames.h"
#include "tree-ssa-live.h"
#include "tree-ssa-coalesce.h"
-#include "explow.h"
#include "diagnostic-core.h"
basic_block bb;
ssa_op_iter iter;
live_track_p live;
- basic_block entry;
-
- /* If inter-variable coalescing is enabled, we may attempt to
- coalesce variables from different base variables, including
- different parameters, so we have to make sure default defs live
- at the entry block conflict with each other. */
- if (flag_tree_coalesce_vars)
- entry = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
- else
- entry = NULL;
map = live_var_map (liveinfo);
graph = ssa_conflicts_new (num_var_partitions (map));
live_track_process_def (live, result, graph);
}
- /* Pretend there are defs for params' default defs at the start
- of the (post-)entry block. */
- if (bb == entry)
- {
- unsigned base;
- bitmap_iterator bi;
- EXECUTE_IF_SET_IN_BITMAP (live->live_base_var, 0, base, bi)
- {
- bitmap_iterator bi2;
- unsigned part;
- EXECUTE_IF_SET_IN_BITMAP (live->live_base_partitions[base],
- 0, part, bi2)
- {
- tree var = partition_to_var (map, part);
- if (!SSA_NAME_VAR (var)
- || (TREE_CODE (SSA_NAME_VAR (var)) != PARM_DECL
- && TREE_CODE (SSA_NAME_VAR (var)) != RESULT_DECL)
- || !SSA_NAME_IS_DEFAULT_DEF (var))
- continue;
- live_track_process_def (live, var, graph);
- }
- }
- }
-
live_track_clear_base_vars (live);
}
{
var1 = partition_to_var (map, p1);
var2 = partition_to_var (map, p2);
-
z = var_union (map, var1, var2);
if (z == NO_PARTITION)
{
if (debug)
fprintf (debug, ": Success -> %d\n", z);
-
return true;
}
}
-/* Output partition map MAP with coalescing plan PART to file F. */
-
-void
-dump_part_var_map (FILE *f, partition part, var_map map)
-{
- int t;
- unsigned x, y;
- int p;
-
- fprintf (f, "\nCoalescible Partition map \n\n");
-
- for (x = 0; x < map->num_partitions; x++)
- {
- if (map->view_to_partition != NULL)
- p = map->view_to_partition[x];
- else
- p = x;
-
- if (ssa_name (p) == NULL_TREE
- || virtual_operand_p (ssa_name (p)))
- continue;
-
- t = 0;
- for (y = 1; y < num_ssa_names; y++)
- {
- tree var = version_to_var (map, y);
- if (!var)
- continue;
- int q = var_to_partition (map, var);
- p = partition_find (part, q);
- gcc_assert (map->partition_to_base_index[q]
- == map->partition_to_base_index[p]);
-
- if (p == (int)x)
- {
- if (t++ == 0)
- {
- fprintf (f, "Partition %d, base %d (", x,
- map->partition_to_base_index[q]);
- print_generic_expr (f, partition_to_var (map, q), TDF_SLIM);
- fprintf (f, " - ");
- }
- fprintf (f, "%d ", y);
- }
- }
- if (t != 0)
- fprintf (f, ")\n");
- }
- fprintf (f, "\n");
-}
-
-/* Given SSA_NAMEs NAME1 and NAME2, return true if they are candidates for
- coalescing together, false otherwise.
-
- This must stay consistent with var_map_base_init in tree-ssa-live.c. */
-
-bool
-gimple_can_coalesce_p (tree name1, tree name2)
-{
- /* First check the SSA_NAME's associated DECL. Without
- optimization, we only want to coalesce if they have the same DECL
- or both have no associated DECL. */
- tree var1 = SSA_NAME_VAR (name1);
- tree var2 = SSA_NAME_VAR (name2);
- var1 = (var1 && (!VAR_P (var1) || !DECL_IGNORED_P (var1))) ? var1 : NULL_TREE;
- var2 = (var2 && (!VAR_P (var2) || !DECL_IGNORED_P (var2))) ? var2 : NULL_TREE;
- if (var1 != var2 && !flag_tree_coalesce_vars)
- return false;
-
- /* Now check the types. If the types are the same, then we should
- try to coalesce V1 and V2. */
- tree t1 = TREE_TYPE (name1);
- tree t2 = TREE_TYPE (name2);
- if (t1 == t2)
- {
- check_modes:
- /* If the base variables are the same, we're good: none of the
- other tests below could possibly fail. */
- var1 = SSA_NAME_VAR (name1);
- var2 = SSA_NAME_VAR (name2);
- if (var1 == var2)
- return true;
-
- /* We don't want to coalesce two SSA names if one of the base
- variables is supposed to be a register while the other is
- supposed to be on the stack. Anonymous SSA names take
- registers, but when not optimizing, user variables should go
- on the stack, so coalescing them with the anonymous variable
- as the partition leader would end up assigning the user
- variable to a register. Don't do that! */
- bool reg1 = !var1 || use_register_for_decl (var1);
- bool reg2 = !var2 || use_register_for_decl (var2);
- if (reg1 != reg2)
- return false;
-
- /* Check that the promoted modes are the same. We don't want to
- coalesce if the promoted modes would be different. Only
- PARM_DECLs and RESULT_DECLs have different promotion rules,
- so skip the test if we both are variables or anonymous
- SSA_NAMEs. */
- return ((!var1 || VAR_P (var1)) && (!var2 || VAR_P (var2)))
- || promote_ssa_mode (name1, NULL) == promote_ssa_mode (name2, NULL);
- }
-
- /* If the types are not the same, check for a canonical type match. This
- (for example) allows coalescing when the types are fundamentally the
- same, but just have different names.
-
- Note pointer types with different address spaces may have the same
- canonical type. Those are rejected for coalescing by the
- types_compatible_p check. */
- if (TYPE_CANONICAL (t1)
- && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
- && types_compatible_p (t1, t2))
- goto check_modes;
-
- return false;
-}
-
-/* Fill in MAP's partition_to_base_index, with one index for each
- partition of SSA names USED_IN_COPIES and related by CL coalesce
- possibilities. This must match gimple_can_coalesce_p in the
- optimized case. */
-
-static void
-compute_optimized_partition_bases (var_map map, bitmap used_in_copies,
- coalesce_list_p cl)
-{
- int parts = num_var_partitions (map);
- partition tentative = partition_new (parts);
-
- /* Partition the SSA versions so that, for each coalescible
- pair, both of its members are in the same partition in
- TENTATIVE. */
- gcc_assert (!cl->sorted);
- coalesce_pair_p node;
- coalesce_iterator_type ppi;
- FOR_EACH_PARTITION_PAIR (node, ppi, cl)
- {
- tree v1 = ssa_name (node->first_element);
- int p1 = partition_find (tentative, var_to_partition (map, v1));
- tree v2 = ssa_name (node->second_element);
- int p2 = partition_find (tentative, var_to_partition (map, v2));
-
- if (p1 == p2)
- continue;
-
- partition_union (tentative, p1, p2);
- }
-
- /* We have to deal with cost one pairs too. */
- for (cost_one_pair_d *co = cl->cost_one_list; co; co = co->next)
- {
- tree v1 = ssa_name (co->first_element);
- int p1 = partition_find (tentative, var_to_partition (map, v1));
- tree v2 = ssa_name (co->second_element);
- int p2 = partition_find (tentative, var_to_partition (map, v2));
-
- if (p1 == p2)
- continue;
-
- partition_union (tentative, p1, p2);
- }
-
- /* And also with abnormal edges. */
- basic_block bb;
- edge e;
- edge_iterator ei;
- FOR_EACH_BB_FN (bb, cfun)
- {
- FOR_EACH_EDGE (e, ei, bb->preds)
- if (e->flags & EDGE_ABNORMAL)
- {
- gphi_iterator gsi;
- for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi);
- gsi_next (&gsi))
- {
- gphi *phi = gsi.phi ();
- tree arg = PHI_ARG_DEF (phi, e->dest_idx);
- if (SSA_NAME_IS_DEFAULT_DEF (arg)
- && (!SSA_NAME_VAR (arg)
- || TREE_CODE (SSA_NAME_VAR (arg)) != PARM_DECL))
- continue;
-
- tree res = PHI_RESULT (phi);
-
- int p1 = partition_find (tentative, var_to_partition (map, res));
- int p2 = partition_find (tentative, var_to_partition (map, arg));
-
- if (p1 == p2)
- continue;
-
- partition_union (tentative, p1, p2);
- }
- }
- }
-
- map->partition_to_base_index = XCNEWVEC (int, parts);
- auto_vec<unsigned int> index_map (parts);
- if (parts)
- index_map.quick_grow (parts);
-
- const unsigned no_part = -1;
- unsigned count = parts;
- while (count)
- index_map[--count] = no_part;
-
- /* Initialize MAP's mapping from partition to base index, using
- as base indices an enumeration of the TENTATIVE partitions in
- which each SSA version ended up, so that we compute conflicts
- between all SSA versions that ended up in the same potential
- coalesce partition. */
- bitmap_iterator bi;
- unsigned i;
- EXECUTE_IF_SET_IN_BITMAP (used_in_copies, 0, i, bi)
- {
- int pidx = var_to_partition (map, ssa_name (i));
- int base = partition_find (tentative, pidx);
- if (index_map[base] != no_part)
- continue;
- index_map[base] = count++;
- }
-
- map->num_basevars = count;
-
- EXECUTE_IF_SET_IN_BITMAP (used_in_copies, 0, i, bi)
- {
- int pidx = var_to_partition (map, ssa_name (i));
- int base = partition_find (tentative, pidx);
- gcc_assert (index_map[base] < count);
- map->partition_to_base_index[pidx] = index_map[base];
- }
-
- if (dump_file && (dump_flags & TDF_DETAILS))
- dump_part_var_map (dump_file, tentative, map);
-
- partition_delete (tentative);
-}
-
-/* Hashtable helpers. */
-
-struct tree_int_map_hasher : typed_noop_remove <tree_int_map>
-{
- typedef tree_int_map *value_type;
- typedef tree_int_map *compare_type;
- static inline hashval_t hash (const tree_int_map *);
- static inline bool equal (const tree_int_map *, const tree_int_map *);
-};
-
-inline hashval_t
-tree_int_map_hasher::hash (const tree_int_map *v)
-{
- return tree_map_base_hash (v);
-}
-
-inline bool
-tree_int_map_hasher::equal (const tree_int_map *v, const tree_int_map *c)
-{
- return tree_int_map_eq (v, c);
-}
-
-/* This routine will initialize the basevar fields of MAP with base
- names. Partitions will share the same base if they have the same
- SSA_NAME_VAR, or, being anonymous variables, the same type. This
- must match gimple_can_coalesce_p in the non-optimized case. */
-
-static void
-compute_samebase_partition_bases (var_map map)
-{
- int x, num_part;
- tree var;
- struct tree_int_map *m, *mapstorage;
-
- num_part = num_var_partitions (map);
- hash_table<tree_int_map_hasher> tree_to_index (num_part);
- /* We can have at most num_part entries in the hash tables, so it's
- enough to allocate so many map elements once, saving some malloc
- calls. */
- mapstorage = m = XNEWVEC (struct tree_int_map, num_part);
-
- /* If a base table already exists, clear it, otherwise create it. */
- free (map->partition_to_base_index);
- map->partition_to_base_index = (int *) xmalloc (sizeof (int) * num_part);
-
- /* Build the base variable list, and point partitions at their bases. */
- for (x = 0; x < num_part; x++)
- {
- struct tree_int_map **slot;
- unsigned baseindex;
- var = partition_to_var (map, x);
- if (SSA_NAME_VAR (var)
- && (!VAR_P (SSA_NAME_VAR (var))
- || !DECL_IGNORED_P (SSA_NAME_VAR (var))))
- m->base.from = SSA_NAME_VAR (var);
- else
- /* This restricts what anonymous SSA names we can coalesce
- as it restricts the sets we compute conflicts for.
- Using TREE_TYPE to generate sets is the easies as
- type equivalency also holds for SSA names with the same
- underlying decl.
-
- Check gimple_can_coalesce_p when changing this code. */
- m->base.from = (TYPE_CANONICAL (TREE_TYPE (var))
- ? TYPE_CANONICAL (TREE_TYPE (var))
- : TREE_TYPE (var));
- /* If base variable hasn't been seen, set it up. */
- slot = tree_to_index.find_slot (m, INSERT);
- if (!*slot)
- {
- baseindex = m - mapstorage;
- m->to = baseindex;
- *slot = m;
- m++;
- }
- else
- baseindex = (*slot)->to;
- map->partition_to_base_index[x] = baseindex;
- }
-
- map->num_basevars = m - mapstorage;
-
- free (mapstorage);
-}
-
/* Reduce the number of copies by coalescing variables in the function. Return
a partition map with the resulting coalesces. */
cl = create_coalesce_list ();
map = create_outofssa_var_map (cl, used_in_copies);
- /* If this optimization is disabled, we need to coalesce all the
- names originating from the same SSA_NAME_VAR so debug info
- remains undisturbed. */
- if (!flag_tree_coalesce_vars)
+ /* If optimization is disabled, we need to coalesce all the names originating
+ from the same SSA_NAME_VAR so debug info remains undisturbed. */
+ if (!optimize)
{
hash_table<ssa_name_var_hash> ssa_name_hash (10);
if (dump_file && (dump_flags & TDF_DETAILS))
dump_var_map (dump_file, map);
- partition_view_bitmap (map, used_in_copies);
-
- if (flag_tree_coalesce_vars)
- compute_optimized_partition_bases (map, used_in_copies, cl);
- else
- compute_samebase_partition_bases (map);
-
+ /* Don't calculate live ranges for variables not in the coalesce list. */
+ partition_view_bitmap (map, used_in_copies, true);
BITMAP_FREE (used_in_copies);
if (num_var_partitions (map) < 1)
/* Now coalesce everything in the list. */
coalesce_partitions (map, graph, cl,
- ((dump_flags & TDF_DETAILS) ? dump_file : NULL));
+ ((dump_flags & TDF_DETAILS) ? dump_file
+ : NULL));
delete_coalesce_list (cl);
ssa_conflicts_delete (graph);
#define GCC_TREE_SSA_COALESCE_H
extern var_map coalesce_ssa_name (void);
-extern bool gimple_can_coalesce_p (tree, tree);
#endif /* GCC_TREE_SSA_COALESCE_H */
--- /dev/null
+/* Rename SSA copies.
+ Copyright (C) 2004-2015 Free Software Foundation, Inc.
+ Contributed by Andrew MacLeod <amacleod@redhat.com>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "input.h"
+#include "alias.h"
+#include "symtab.h"
+#include "tree.h"
+#include "fold-const.h"
+#include "predict.h"
+#include "hard-reg-set.h"
+#include "function.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "basic-block.h"
+#include "tree-ssa-alias.h"
+#include "internal-fn.h"
+#include "gimple-expr.h"
+#include "is-a.h"
+#include "gimple.h"
+#include "gimple-iterator.h"
+#include "flags.h"
+#include "tree-pretty-print.h"
+#include "bitmap.h"
+#include "gimple-ssa.h"
+#include "stringpool.h"
+#include "tree-ssanames.h"
+#include "rtl.h"
+#include "insn-config.h"
+#include "expmed.h"
+#include "dojump.h"
+#include "explow.h"
+#include "calls.h"
+#include "emit-rtl.h"
+#include "varasm.h"
+#include "stmt.h"
+#include "expr.h"
+#include "tree-dfa.h"
+#include "tree-inline.h"
+#include "tree-ssa-live.h"
+#include "tree-pass.h"
+#include "langhooks.h"
+
+static struct
+{
+ /* Number of copies coalesced. */
+ int coalesced;
+} stats;
+
+/* The following routines implement the SSA copy renaming phase.
+
+ This optimization looks for copies between 2 SSA_NAMES, either through a
+ direct copy, or an implicit one via a PHI node result and its arguments.
+
+ Each copy is examined to determine if it is possible to rename the base
+ variable of one of the operands to the same variable as the other operand.
+ i.e.
+ T.3_5 = <blah>
+ a_1 = T.3_5
+
+ If this copy couldn't be copy propagated, it could possibly remain in the
+ program throughout the optimization phases. After SSA->normal, it would
+ become:
+
+ T.3 = <blah>
+ a = T.3
+
+ Since T.3_5 is distinct from all other SSA versions of T.3, there is no
+ fundamental reason why the base variable needs to be T.3, subject to
+ certain restrictions. This optimization attempts to determine if we can
+ change the base variable on copies like this, and result in code such as:
+
+ a_5 = <blah>
+ a_1 = a_5
+
+ This gives the SSA->normal pass a shot at coalescing a_1 and a_5. If it is
+ possible, the copy goes away completely. If it isn't possible, a new temp
+ will be created for a_5, and you will end up with the exact same code:
+
+ a.8 = <blah>
+ a = a.8
+
+ The other benefit of performing this optimization relates to what variables
+ are chosen in copies. Gimplification of the program uses temporaries for
+ a lot of things. expressions like
+
+ a_1 = <blah>
+ <blah2> = a_1
+
+ get turned into
+
+ T.3_5 = <blah>
+ a_1 = T.3_5
+ <blah2> = a_1
+
+ Copy propagation is done in a forward direction, and if we can propagate
+ through the copy, we end up with:
+
+ T.3_5 = <blah>
+ <blah2> = T.3_5
+
+ The copy is gone, but so is all reference to the user variable 'a'. By
+ performing this optimization, we would see the sequence:
+
+ a_5 = <blah>
+ a_1 = a_5
+ <blah2> = a_1
+
+ which copy propagation would then turn into:
+
+ a_5 = <blah>
+ <blah2> = a_5
+
+ and so we still retain the user variable whenever possible. */
+
+
+/* Coalesce the partitions in MAP representing VAR1 and VAR2 if it is valid.
+ Choose a representative for the partition, and send debug info to DEBUG. */
+
+static void
+copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
+{
+ int p1, p2, p3;
+ tree root1, root2;
+ tree rep1, rep2;
+ bool ign1, ign2, abnorm;
+
+ gcc_assert (TREE_CODE (var1) == SSA_NAME);
+ gcc_assert (TREE_CODE (var2) == SSA_NAME);
+
+ register_ssa_partition (map, var1);
+ register_ssa_partition (map, var2);
+
+ p1 = partition_find (map->var_partition, SSA_NAME_VERSION (var1));
+ p2 = partition_find (map->var_partition, SSA_NAME_VERSION (var2));
+
+ if (debug)
+ {
+ fprintf (debug, "Try : ");
+ print_generic_expr (debug, var1, TDF_SLIM);
+ fprintf (debug, "(P%d) & ", p1);
+ print_generic_expr (debug, var2, TDF_SLIM);
+ fprintf (debug, "(P%d)", p2);
+ }
+
+ gcc_assert (p1 != NO_PARTITION);
+ gcc_assert (p2 != NO_PARTITION);
+
+ if (p1 == p2)
+ {
+ if (debug)
+ fprintf (debug, " : Already coalesced.\n");
+ return;
+ }
+
+ rep1 = partition_to_var (map, p1);
+ rep2 = partition_to_var (map, p2);
+ root1 = SSA_NAME_VAR (rep1);
+ root2 = SSA_NAME_VAR (rep2);
+ if (!root1 && !root2)
+ return;
+
+ /* Don't coalesce if one of the variables occurs in an abnormal PHI. */
+ abnorm = (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep1)
+ || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep2));
+ if (abnorm)
+ {
+ if (debug)
+ fprintf (debug, " : Abnormal PHI barrier. No coalesce.\n");
+ return;
+ }
+
+ /* Partitions already have the same root, simply merge them. */
+ if (root1 == root2)
+ {
+ p1 = partition_union (map->var_partition, p1, p2);
+ if (debug)
+ fprintf (debug, " : Same root, coalesced --> P%d.\n", p1);
+ return;
+ }
+
+ /* Never attempt to coalesce 2 different parameters. */
+ if ((root1 && TREE_CODE (root1) == PARM_DECL)
+ && (root2 && TREE_CODE (root2) == PARM_DECL))
+ {
+ if (debug)
+ fprintf (debug, " : 2 different PARM_DECLS. No coalesce.\n");
+ return;
+ }
+
+ if ((root1 && TREE_CODE (root1) == RESULT_DECL)
+ != (root2 && TREE_CODE (root2) == RESULT_DECL))
+ {
+ if (debug)
+ fprintf (debug, " : One root a RESULT_DECL. No coalesce.\n");
+ return;
+ }
+
+ ign1 = !root1 || (TREE_CODE (root1) == VAR_DECL && DECL_IGNORED_P (root1));
+ ign2 = !root2 || (TREE_CODE (root2) == VAR_DECL && DECL_IGNORED_P (root2));
+
+ /* Refrain from coalescing user variables, if requested. */
+ if (!ign1 && !ign2)
+ {
+ if (flag_ssa_coalesce_vars && DECL_FROM_INLINE (root2))
+ ign2 = true;
+ else if (flag_ssa_coalesce_vars && DECL_FROM_INLINE (root1))
+ ign1 = true;
+ else if (flag_ssa_coalesce_vars != 2)
+ {
+ if (debug)
+ fprintf (debug, " : 2 different USER vars. No coalesce.\n");
+ return;
+ }
+ else
+ ign2 = true;
+ }
+
+ /* If both values have default defs, we can't coalesce. If only one has a
+ tag, make sure that variable is the new root partition. */
+ if (root1 && ssa_default_def (cfun, root1))
+ {
+ if (root2 && ssa_default_def (cfun, root2))
+ {
+ if (debug)
+ fprintf (debug, " : 2 default defs. No coalesce.\n");
+ return;
+ }
+ else
+ {
+ ign2 = true;
+ ign1 = false;
+ }
+ }
+ else if (root2 && ssa_default_def (cfun, root2))
+ {
+ ign1 = true;
+ ign2 = false;
+ }
+
+ /* Do not coalesce if we cannot assign a symbol to the partition. */
+ if (!(!ign2 && root2)
+ && !(!ign1 && root1))
+ {
+ if (debug)
+ fprintf (debug, " : Choosen variable has no root. No coalesce.\n");
+ return;
+ }
+
+ /* Don't coalesce if the new chosen root variable would be read-only.
+ If both ign1 && ign2, then the root var of the larger partition
+ wins, so reject in that case if any of the root vars is TREE_READONLY.
+ Otherwise reject only if the root var, on which replace_ssa_name_symbol
+ will be called below, is readonly. */
+ if (((root1 && TREE_READONLY (root1)) && ign2)
+ || ((root2 && TREE_READONLY (root2)) && ign1))
+ {
+ if (debug)
+ fprintf (debug, " : Readonly variable. No coalesce.\n");
+ return;
+ }
+
+ /* Don't coalesce if the two variables aren't type compatible . */
+ if (!types_compatible_p (TREE_TYPE (var1), TREE_TYPE (var2))
+ /* There is a disconnect between the middle-end type-system and
+ VRP, avoid coalescing enum types with different bounds. */
+ || ((TREE_CODE (TREE_TYPE (var1)) == ENUMERAL_TYPE
+ || TREE_CODE (TREE_TYPE (var2)) == ENUMERAL_TYPE)
+ && TREE_TYPE (var1) != TREE_TYPE (var2)))
+ {
+ if (debug)
+ fprintf (debug, " : Incompatible types. No coalesce.\n");
+ return;
+ }
+
+ /* Merge the two partitions. */
+ p3 = partition_union (map->var_partition, p1, p2);
+
+ /* Set the root variable of the partition to the better choice, if there is
+ one. */
+ if (!ign2 && root2)
+ replace_ssa_name_symbol (partition_to_var (map, p3), root2);
+ else if (!ign1 && root1)
+ replace_ssa_name_symbol (partition_to_var (map, p3), root1);
+ else
+ gcc_unreachable ();
+
+ if (debug)
+ {
+ fprintf (debug, " --> P%d ", p3);
+ print_generic_expr (debug, SSA_NAME_VAR (partition_to_var (map, p3)),
+ TDF_SLIM);
+ fprintf (debug, "\n");
+ }
+}
+
+
+namespace {
+
+const pass_data pass_data_rename_ssa_copies =
+{
+ GIMPLE_PASS, /* type */
+ "copyrename", /* name */
+ OPTGROUP_NONE, /* optinfo_flags */
+ TV_TREE_COPY_RENAME, /* tv_id */
+ ( PROP_cfg | PROP_ssa ), /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+};
+
+class pass_rename_ssa_copies : public gimple_opt_pass
+{
+public:
+ pass_rename_ssa_copies (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_rename_ssa_copies, ctxt)
+ {}
+
+ /* opt_pass methods: */
+ opt_pass * clone () { return new pass_rename_ssa_copies (m_ctxt); }
+ virtual bool gate (function *) { return flag_tree_copyrename != 0; }
+ virtual unsigned int execute (function *);
+
+}; // class pass_rename_ssa_copies
+
+/* This function will make a pass through the IL, and attempt to coalesce any
+ SSA versions which occur in PHI's or copies. Coalescing is accomplished by
+ changing the underlying root variable of all coalesced version. This will
+ then cause the SSA->normal pass to attempt to coalesce them all to the same
+ variable. */
+
+unsigned int
+pass_rename_ssa_copies::execute (function *fun)
+{
+ var_map map;
+ basic_block bb;
+ tree var, part_var;
+ gimple stmt;
+ unsigned x;
+ FILE *debug;
+
+ memset (&stats, 0, sizeof (stats));
+
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ debug = dump_file;
+ else
+ debug = NULL;
+
+ map = init_var_map (num_ssa_names);
+
+ FOR_EACH_BB_FN (bb, fun)
+ {
+ /* Scan for real copies. */
+ for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
+ gsi_next (&gsi))
+ {
+ stmt = gsi_stmt (gsi);
+ if (gimple_assign_ssa_name_copy_p (stmt))
+ {
+ tree lhs = gimple_assign_lhs (stmt);
+ tree rhs = gimple_assign_rhs1 (stmt);
+
+ copy_rename_partition_coalesce (map, lhs, rhs, debug);
+ }
+ }
+ }
+
+ FOR_EACH_BB_FN (bb, fun)
+ {
+ /* Treat PHI nodes as copies between the result and each argument. */
+ for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi);
+ gsi_next (&gsi))
+ {
+ size_t i;
+ tree res;
+ gphi *phi = gsi.phi ();
+ res = gimple_phi_result (phi);
+
+ /* Do not process virtual SSA_NAMES. */
+ if (virtual_operand_p (res))
+ continue;
+
+ /* Make sure to only use the same partition for an argument
+ as the result but never the other way around. */
+ if (SSA_NAME_VAR (res)
+ && !DECL_IGNORED_P (SSA_NAME_VAR (res)))
+ for (i = 0; i < gimple_phi_num_args (phi); i++)
+ {
+ tree arg = PHI_ARG_DEF (phi, i);
+ if (TREE_CODE (arg) == SSA_NAME)
+ copy_rename_partition_coalesce (map, res, arg,
+ debug);
+ }
+ /* Else if all arguments are in the same partition try to merge
+ it with the result. */
+ else
+ {
+ int all_p_same = -1;
+ int p = -1;
+ for (i = 0; i < gimple_phi_num_args (phi); i++)
+ {
+ tree arg = PHI_ARG_DEF (phi, i);
+ if (TREE_CODE (arg) != SSA_NAME)
+ {
+ all_p_same = 0;
+ break;
+ }
+ else if (all_p_same == -1)
+ {
+ p = partition_find (map->var_partition,
+ SSA_NAME_VERSION (arg));
+ all_p_same = 1;
+ }
+ else if (all_p_same == 1
+ && p != partition_find (map->var_partition,
+ SSA_NAME_VERSION (arg)))
+ {
+ all_p_same = 0;
+ break;
+ }
+ }
+ if (all_p_same == 1)
+ copy_rename_partition_coalesce (map, res,
+ PHI_ARG_DEF (phi, 0),
+ debug);
+ }
+ }
+ }
+
+ if (debug)
+ dump_var_map (debug, map);
+
+ /* Now one more pass to make all elements of a partition share the same
+ root variable. */
+
+ for (x = 1; x < num_ssa_names; x++)
+ {
+ part_var = partition_to_var (map, x);
+ if (!part_var)
+ continue;
+ var = ssa_name (x);
+ if (SSA_NAME_VAR (var) == SSA_NAME_VAR (part_var))
+ continue;
+ if (debug)
+ {
+ fprintf (debug, "Coalesced ");
+ print_generic_expr (debug, var, TDF_SLIM);
+ fprintf (debug, " to ");
+ print_generic_expr (debug, part_var, TDF_SLIM);
+ fprintf (debug, "\n");
+ }
+ stats.coalesced++;
+ replace_ssa_name_symbol (var, SSA_NAME_VAR (part_var));
+ }
+
+ statistics_counter_event (fun, "copies coalesced",
+ stats.coalesced);
+ delete_var_map (map);
+ return 0;
+}
+
+} // anon namespace
+
+gimple_opt_pass *
+make_pass_rename_ssa_copies (gcc::context *ctxt)
+{
+ return new pass_rename_ssa_copies (ctxt);
+}
ssa_name or variable, and vice versa. */
+/* Hashtable helpers. */
+
+struct tree_int_map_hasher : typed_noop_remove <tree_int_map>
+{
+ typedef tree_int_map *value_type;
+ typedef tree_int_map *compare_type;
+ static inline hashval_t hash (const tree_int_map *);
+ static inline bool equal (const tree_int_map *, const tree_int_map *);
+};
+
+inline hashval_t
+tree_int_map_hasher::hash (const tree_int_map *v)
+{
+ return tree_map_base_hash (v);
+}
+
+inline bool
+tree_int_map_hasher::equal (const tree_int_map *v, const tree_int_map *c)
+{
+ return tree_int_map_eq (v, c);
+}
+
+
+/* This routine will initialize the basevar fields of MAP. */
+
+static void
+var_map_base_init (var_map map)
+{
+ int x, num_part;
+ tree var;
+ struct tree_int_map *m, *mapstorage;
+
+ num_part = num_var_partitions (map);
+ hash_table<tree_int_map_hasher> tree_to_index (num_part);
+ /* We can have at most num_part entries in the hash tables, so it's
+ enough to allocate so many map elements once, saving some malloc
+ calls. */
+ mapstorage = m = XNEWVEC (struct tree_int_map, num_part);
+
+ /* If a base table already exists, clear it, otherwise create it. */
+ free (map->partition_to_base_index);
+ map->partition_to_base_index = (int *) xmalloc (sizeof (int) * num_part);
+
+ /* Build the base variable list, and point partitions at their bases. */
+ for (x = 0; x < num_part; x++)
+ {
+ struct tree_int_map **slot;
+ unsigned baseindex;
+ var = partition_to_var (map, x);
+ if (SSA_NAME_VAR (var)
+ && (!VAR_P (SSA_NAME_VAR (var))
+ || !DECL_IGNORED_P (SSA_NAME_VAR (var))))
+ m->base.from = SSA_NAME_VAR (var);
+ else
+ /* This restricts what anonymous SSA names we can coalesce
+ as it restricts the sets we compute conflicts for.
+ Using TREE_TYPE to generate sets is the easies as
+ type equivalency also holds for SSA names with the same
+ underlying decl.
+
+ Check gimple_can_coalesce_p when changing this code. */
+ m->base.from = (TYPE_CANONICAL (TREE_TYPE (var))
+ ? TYPE_CANONICAL (TREE_TYPE (var))
+ : TREE_TYPE (var));
+ /* If base variable hasn't been seen, set it up. */
+ slot = tree_to_index.find_slot (m, INSERT);
+ if (!*slot)
+ {
+ baseindex = m - mapstorage;
+ m->to = baseindex;
+ *slot = m;
+ m++;
+ }
+ else
+ baseindex = (*slot)->to;
+ map->partition_to_base_index[x] = baseindex;
+ }
+
+ map->num_basevars = m - mapstorage;
+
+ free (mapstorage);
+}
+
+
/* Remove the base table in MAP. */
static void
}
-/* Create a partition view which includes all the used partitions in MAP. */
+/* Create a partition view which includes all the used partitions in MAP. If
+ WANT_BASES is true, create the base variable map as well. */
void
-partition_view_normal (var_map map)
+partition_view_normal (var_map map, bool want_bases)
{
bitmap used;
used = partition_view_init (map);
partition_view_fini (map, used);
- var_map_base_fini (map);
+ if (want_bases)
+ var_map_base_init (map);
+ else
+ var_map_base_fini (map);
}
as well. */
void
-partition_view_bitmap (var_map map, bitmap only)
+partition_view_bitmap (var_map map, bitmap only, bool want_bases)
{
bitmap used;
bitmap new_partitions = BITMAP_ALLOC (NULL);
}
partition_view_fini (map, new_partitions);
- var_map_base_fini (map);
+ if (want_bases)
+ var_map_base_init (map);
+ else
+ var_map_base_fini (map);
}
extern var_map init_var_map (int);
extern void delete_var_map (var_map);
extern int var_union (var_map, tree, tree);
-extern void partition_view_normal (var_map);
-extern void partition_view_bitmap (var_map, bitmap);
+extern void partition_view_normal (var_map, bool);
+extern void partition_view_bitmap (var_map, bitmap, bool);
extern void dump_scope_blocks (FILE *, int);
extern void debug_scope_block (tree, int);
extern void debug_scope_blocks (int);
if (!CONVERT_EXPR_P (e) || !operand_equal_p (e, unsigned_base, 0))
continue;
e = TREE_OPERAND (e, 0);
- /* If E has an unsigned type, the operand equality test below
- would fail, but the equality test above would have already
- verified the equality, so we can proceed with it. */
- gcc_assert (TYPE_UNSIGNED (TREE_TYPE (e))
- || operand_equal_p (e, base, 0));
+ gcc_assert (operand_equal_p (e, base, 0));
if (tree_int_cst_sign_bit (step))
{
code = LT_EXPR;
#include "domwalk.h"
#include "tree-pass.h"
#include "tree-ssa-propagate.h"
-#include "bitmap.h"
-#include "stringpool.h"
-#include "tree-ssanames.h"
-#include "tree-ssa-live.h"
-#include "tree-ssa-coalesce.h"
/* The basic structure describing an equivalency created by traversing
an edge. Traversing the edge effectively means that we can assume
registers, as well as associations between MEMs and VALUEs. */
static void
-dataflow_set_clear_at_call (dataflow_set *set, rtx_insn *call_insn)
+dataflow_set_clear_at_call (dataflow_set *set)
{
unsigned int r;
hard_reg_set_iterator hrsi;
- HARD_REG_SET invalidated_regs;
- get_call_reg_set_usage (call_insn, &invalidated_regs,
- regs_invalidated_by_call);
-
- EXECUTE_IF_SET_IN_HARD_REG_SET (invalidated_regs, 0, r, hrsi)
+ EXECUTE_IF_SET_IN_HARD_REG_SET (regs_invalidated_by_call, 0, r, hrsi)
var_regno_delete (set, r);
if (MAY_HAVE_DEBUG_INSNS)
switch (mo->type)
{
case MO_CALL:
- dataflow_set_clear_at_call (out, insn);
+ dataflow_set_clear_at_call (out);
break;
case MO_USE:
switch (mo->type)
{
case MO_CALL:
- dataflow_set_clear_at_call (set, insn);
+ dataflow_set_clear_at_call (set);
emit_notes_for_changes (insn, EMIT_NOTE_AFTER_CALL_INSN, set->vars);
{
rtx arguments = mo->u.loc, *p = &arguments;
projects / thirdparty / gcc.git / commitdiff
