/* Conditional constant propagation pass for the GNU compiler.
- Copyright (C) 2000-2019 Free Software Foundation, Inc.
+ Copyright (C) 2000-2020 Free Software Foundation, Inc.
Adapted from original RTL SSA-CCP by Daniel Berlin <dberlin@dberlin.org>
Adapted to GIMPLE trees by Diego Novillo <dnovillo@redhat.com>
#include "tree-cfg.h"
#include "tree-ssa-propagate.h"
#include "dbgcnt.h"
-#include "params.h"
#include "builtins.h"
#include "cfgloop.h"
#include "stor-layout.h"
#include "stringpool.h"
#include "attribs.h"
#include "tree-vector-builder.h"
+#include "cgraph.h"
+#include "alloc-pool.h"
+#include "symbol-summary.h"
+#include "ipa-utils.h"
+#include "ipa-prop.h"
/* Possible lattice values. */
typedef enum
if (flag_tree_bit_ccp)
{
wide_int nonzero_bits = get_nonzero_bits (var);
- if (nonzero_bits != -1)
+ tree value;
+ widest_int mask;
+
+ if (SSA_NAME_VAR (var)
+ && TREE_CODE (SSA_NAME_VAR (var)) == PARM_DECL
+ && ipcp_get_parm_bits (SSA_NAME_VAR (var), &value, &mask))
+ {
+ val.lattice_val = CONSTANT;
+ val.value = value;
+ val.mask = mask;
+ if (nonzero_bits != -1)
+ val.mask &= extend_mask (nonzero_bits,
+ TYPE_SIGN (TREE_TYPE (var)));
+ }
+ else if (nonzero_bits != -1)
{
val.lattice_val = CONSTANT;
val.value = build_zero_cst (TREE_TYPE (var));
- val.mask = extend_mask (nonzero_bits, TYPE_SIGN (TREE_TYPE (var)));
+ val.mask = extend_mask (nonzero_bits,
+ TYPE_SIGN (TREE_TYPE (var)));
}
}
}
val.mask = -1;
}
if (for_bits_p
- && val.lattice_val == CONSTANT
- && TREE_CODE (val.value) == ADDR_EXPR)
- val = get_value_from_alignment (val.value);
+ && val.lattice_val == CONSTANT)
+ {
+ if (TREE_CODE (val.value) == ADDR_EXPR)
+ val = get_value_from_alignment (val.value);
+ else if (TREE_CODE (val.value) != INTEGER_CST)
+ {
+ val.lattice_val = VARYING;
+ val.value = NULL_TREE;
+ val.mask = -1;
+ }
+ }
/* Fall back to a copy value. */
if (!for_bits_p
&& val.lattice_val == VARYING
TYPE_SIGN (TREE_TYPE (rhs2)), TYPE_PRECISION (TREE_TYPE (rhs2)),
value_to_wide_int (r2val), r2val.mask);
+ /* (x * x) & 2 == 0. */
+ if (code == MULT_EXPR && rhs1 == rhs2 && TYPE_PRECISION (type) > 1)
+ {
+ widest_int m = 2;
+ if (wi::sext (mask, TYPE_PRECISION (type)) != -1)
+ value = wi::bit_and_not (value, m);
+ else
+ value = 0;
+ mask = wi::bit_and_not (mask, m);
+ }
+
if (wi::sext (mask, TYPE_PRECISION (type)) != -1)
{
val.lattice_val = CONSTANT;
FOR_EACH_IMM_USE_STMT (stmt, iter, saved_val)
if (gimple_call_builtin_p (stmt, BUILT_IN_STACK_RESTORE))
{
- clobber = build_constructor (TREE_TYPE (var),
- NULL);
- TREE_THIS_VOLATILE (clobber) = 1;
+ clobber = build_clobber (TREE_TYPE (var));
clobber_stmt = gimple_build_assign (var, clobber);
i = gsi_for_stmt (stmt);
else if (gimple_assign_ssa_name_copy_p (stmt))
insert_clobber_before_stack_restore (gimple_assign_lhs (stmt), var,
visited);
- else
- gcc_assert (is_gimple_debug (stmt));
}
/* Advance the iterator to the previous non-debug gimple statement in the same
/* Find a BUILT_IN_STACK_SAVE dominating gsi_stmt (I), and insert
a clobber of VAR before each matching BUILT_IN_STACK_RESTORE.
- It is possible that BUILT_IN_STACK_SAVE cannot be find in a dominator when a
- previous pass (such as DOM) duplicated it along multiple paths to a BB. In
- that case the function gives up without inserting the clobbers. */
+ It is possible that BUILT_IN_STACK_SAVE cannot be found in a dominator when
+ a previous pass (such as DOM) duplicated it along multiple paths to a BB.
+ In that case the function gives up without inserting the clobbers. */
static void
insert_clobbers_for_var (gimple_stmt_iterator i, tree var)
size = tree_to_uhwi (arg);
/* Heuristic: don't fold large allocas. */
- threshold = (unsigned HOST_WIDE_INT)PARAM_VALUE (PARAM_LARGE_STACK_FRAME);
+ threshold = (unsigned HOST_WIDE_INT)param_large_stack_frame;
/* In case the alloca is located at function entry, it has the same lifetime
as a declared array, so we allow a larger size. */
block = gimple_block (stmt);
elem_type = build_nonstandard_integer_type (BITS_PER_UNIT, 1);
n_elem = size * 8 / BITS_PER_UNIT;
array_type = build_array_type_nelts (elem_type, n_elem);
- var = create_tmp_var (array_type);
+
+ if (tree ssa_name = SSA_NAME_IDENTIFIER (lhs))
+ {
+ /* Give the temporary a name derived from the name of the VLA
+ declaration so it can be referenced in diagnostics. */
+ const char *name = IDENTIFIER_POINTER (ssa_name);
+ var = create_tmp_var (array_type, name);
+ }
+ else
+ var = create_tmp_var (array_type);
+
+ if (gimple *lhsdef = SSA_NAME_DEF_STMT (lhs))
+ {
+ /* Set the temporary's location to that of the VLA declaration
+ so it can be pointed to in diagnostics. */
+ location_t loc = gimple_location (lhsdef);
+ DECL_SOURCE_LOCATION (var) = loc;
+ }
+
SET_DECL_ALIGN (var, TREE_INT_CST_LOW (gimple_call_arg (stmt, 1)));
if (uid != 0)
SET_DECL_PT_UID (var, uid);
}
}
+ /* If there's no extra info from an assume_aligned call,
+ drop it so it doesn't act as otherwise useless dataflow
+ barrier. */
+ if (gimple_call_builtin_p (stmt, BUILT_IN_ASSUME_ALIGNED))
+ {
+ tree ptr = gimple_call_arg (stmt, 0);
+ ccp_prop_value_t ptrval = get_value_for_expr (ptr, true);
+ if (ptrval.lattice_val == CONSTANT
+ && TREE_CODE (ptrval.value) == INTEGER_CST
+ && ptrval.mask != 0)
+ {
+ ccp_prop_value_t val
+ = bit_value_assume_aligned (stmt, NULL_TREE, ptrval, false);
+ unsigned int ptralign = least_bit_hwi (ptrval.mask.to_uhwi ());
+ unsigned int align = least_bit_hwi (val.mask.to_uhwi ());
+ if (ptralign == align
+ && ((TREE_INT_CST_LOW (ptrval.value) & (align - 1))
+ == (TREE_INT_CST_LOW (val.value) & (align - 1))))
+ {
+ bool res = update_call_from_tree (gsi, ptr);
+ gcc_assert (res);
+ return true;
+ }
+ }
+ }
+
/* Propagate into the call arguments. Compared to replace_uses_in
this can use the argument slot types for type verification
instead of the current argument type. We also can safely
|| ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (callee)))
return NULL_TREE;
- if (DECL_FUNCTION_CODE (callee) == BUILT_IN_STACK_RESTORE)
+ if (fndecl_built_in_p (callee, BUILT_IN_STACK_RESTORE))
goto second_stack_restore;
}
bool va_list_simple_ptr;
location_t loc = gimple_location (call);
- if (gimple_code (call) != GIMPLE_CALL)
- return NULL_TREE;
-
callee = gimple_call_fndecl (call);
cfun_va_list = targetm.fn_abi_va_list (callee);
bit, flag);
gimple_call_set_lhs (g, new_lhs);
gimple_set_location (g, gimple_location (call));
- gimple_set_vuse (g, gimple_vuse (call));
- gimple_set_vdef (g, gimple_vdef (call));
+ gimple_move_vops (g, call);
bool throws = stmt_can_throw_internal (cfun, call);
gimple_call_set_nothrow (as_a <gcall *> (g),
gimple_call_nothrow_p (as_a <gcall *> (call)));
- SSA_NAME_DEF_STMT (gimple_vdef (call)) = g;
gimple_stmt_iterator gsi = *gsip;
gsi_insert_after (&gsi, g, GSI_NEW_STMT);
edge e = NULL;
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