/* Medium-level subroutines: convert bit-field store and extract
and shifts, multiplies and divides to rtl instructions.
- Copyright (C) 1987-2017 Free Software Foundation, Inc.
+ Copyright (C) 1987-2020 Free Software Foundation, Inc.
This file is part of GCC.
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
+/* Work around tree-optimization/91825. */
+#pragma GCC diagnostic warning "-Wmaybe-uninitialized"
#include "config.h"
#include "system.h"
struct target_expmed *this_target_expmed = &default_target_expmed;
#endif
+static bool store_integral_bit_field (rtx, opt_scalar_int_mode,
+ unsigned HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT,
+ poly_uint64, poly_uint64,
+ machine_mode, rtx, bool, bool);
static void store_fixed_bit_field (rtx, opt_scalar_int_mode,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
- unsigned HOST_WIDE_INT,
- unsigned HOST_WIDE_INT,
+ poly_uint64, poly_uint64,
rtx, scalar_int_mode, bool);
static void store_fixed_bit_field_1 (rtx, scalar_int_mode,
unsigned HOST_WIDE_INT,
static void store_split_bit_field (rtx, opt_scalar_int_mode,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
- unsigned HOST_WIDE_INT,
- unsigned HOST_WIDE_INT,
+ poly_uint64, poly_uint64,
rtx, scalar_int_mode, bool);
+static rtx extract_integral_bit_field (rtx, opt_scalar_int_mode,
+ unsigned HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT, int, rtx,
+ machine_mode, machine_mode, bool, bool);
static rtx extract_fixed_bit_field (machine_mode, rtx, opt_scalar_int_mode,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT, rtx, int, bool);
PUT_MODE (all->zext, wider_mode);
PUT_MODE (all->wide_mult, wider_mode);
PUT_MODE (all->wide_lshr, wider_mode);
- XEXP (all->wide_lshr, 1) = GEN_INT (mode_bitsize);
+ XEXP (all->wide_lshr, 1)
+ = gen_int_shift_amount (wider_mode, mode_bitsize);
set_mul_widen_cost (speed, wider_mode,
set_src_cost (all->wide_mult, wider_mode, speed));
adjust_bit_field_mem_for_reg (enum extraction_pattern pattern,
rtx op0, HOST_WIDE_INT bitsize,
HOST_WIDE_INT bitnum,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end,
+ poly_uint64 bitregion_start,
+ poly_uint64 bitregion_end,
machine_mode fieldmode,
unsigned HOST_WIDE_INT *new_bitnum)
{
offset is then BITNUM / BITS_PER_UNIT. */
static bool
-lowpart_bit_field_p (unsigned HOST_WIDE_INT bitnum,
- unsigned HOST_WIDE_INT bitsize,
+lowpart_bit_field_p (poly_uint64 bitnum, poly_uint64 bitsize,
machine_mode struct_mode)
{
- unsigned HOST_WIDE_INT regsize = REGMODE_NATURAL_SIZE (struct_mode);
+ poly_uint64 regsize = REGMODE_NATURAL_SIZE (struct_mode);
if (BYTES_BIG_ENDIAN)
- return (bitnum % BITS_PER_UNIT == 0
- && (bitnum + bitsize == GET_MODE_BITSIZE (struct_mode)
- || (bitnum + bitsize) % (regsize * BITS_PER_UNIT) == 0));
+ return (multiple_p (bitnum, BITS_PER_UNIT)
+ && (known_eq (bitnum + bitsize, GET_MODE_BITSIZE (struct_mode))
+ || multiple_p (bitnum + bitsize,
+ regsize * BITS_PER_UNIT)));
else
- return bitnum % (regsize * BITS_PER_UNIT) == 0;
+ return multiple_p (bitnum, regsize * BITS_PER_UNIT);
}
/* Return true if -fstrict-volatile-bitfields applies to an access of OP0
strict_volatile_bitfield_p (rtx op0, unsigned HOST_WIDE_INT bitsize,
unsigned HOST_WIDE_INT bitnum,
scalar_int_mode fieldmode,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end)
+ poly_uint64 bitregion_start,
+ poly_uint64 bitregion_end)
{
unsigned HOST_WIDE_INT modesize = GET_MODE_BITSIZE (fieldmode);
return false;
/* Check for cases where the C++ memory model applies. */
- if (bitregion_end != 0
- && (bitnum - bitnum % modesize < bitregion_start
- || bitnum - bitnum % modesize + modesize - 1 > bitregion_end))
+ if (maybe_ne (bitregion_end, 0U)
+ && (maybe_lt (bitnum - bitnum % modesize, bitregion_start)
+ || maybe_gt (bitnum - bitnum % modesize + modesize - 1,
+ bitregion_end)))
return false;
return true;
}
/* Return true if OP is a memory and if a bitfield of size BITSIZE at
- bit number BITNUM can be treated as a simple value of mode MODE. */
+ bit number BITNUM can be treated as a simple value of mode MODE.
+ Store the byte offset in *BYTENUM if so. */
static bool
-simple_mem_bitfield_p (rtx op0, unsigned HOST_WIDE_INT bitsize,
- unsigned HOST_WIDE_INT bitnum, machine_mode mode)
+simple_mem_bitfield_p (rtx op0, poly_uint64 bitsize, poly_uint64 bitnum,
+ machine_mode mode, poly_uint64 *bytenum)
{
return (MEM_P (op0)
- && bitnum % BITS_PER_UNIT == 0
- && bitsize == GET_MODE_BITSIZE (mode)
+ && multiple_p (bitnum, BITS_PER_UNIT, bytenum)
+ && known_eq (bitsize, GET_MODE_BITSIZE (mode))
&& (!targetm.slow_unaligned_access (mode, MEM_ALIGN (op0))
- || (bitnum % GET_MODE_ALIGNMENT (mode) == 0
+ || (multiple_p (bitnum, GET_MODE_ALIGNMENT (mode))
&& MEM_ALIGN (op0) >= GET_MODE_ALIGNMENT (mode))));
}
\f
unsigned HOST_WIDE_INT bitnum,
rtx value, scalar_int_mode value_mode)
{
- struct expand_operand ops[4];
+ class expand_operand ops[4];
rtx value1;
rtx xop0 = op0;
rtx_insn *last = get_last_insn ();
return false instead. */
static bool
-store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
- unsigned HOST_WIDE_INT bitnum,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end,
+store_bit_field_1 (rtx str_rtx, poly_uint64 bitsize, poly_uint64 bitnum,
+ poly_uint64 bitregion_start, poly_uint64 bitregion_end,
machine_mode fieldmode,
rtx value, bool reverse, bool fallback_p)
{
rtx op0 = str_rtx;
- rtx orig_value;
while (GET_CODE (op0) == SUBREG)
{
/* No action is needed if the target is a register and if the field
lies completely outside that register. This can occur if the source
code contains an out-of-bounds access to a small array. */
- if (REG_P (op0) && bitnum >= GET_MODE_BITSIZE (GET_MODE (op0)))
+ if (REG_P (op0) && known_ge (bitnum, GET_MODE_BITSIZE (GET_MODE (op0))))
return true;
/* Use vec_set patterns for inserting parts of vectors whenever
available. */
machine_mode outermode = GET_MODE (op0);
scalar_mode innermode = GET_MODE_INNER (outermode);
+ poly_uint64 pos;
if (VECTOR_MODE_P (outermode)
&& !MEM_P (op0)
&& optab_handler (vec_set_optab, outermode) != CODE_FOR_nothing
&& fieldmode == innermode
- && bitsize == GET_MODE_BITSIZE (innermode)
- && !(bitnum % GET_MODE_BITSIZE (innermode)))
+ && known_eq (bitsize, GET_MODE_BITSIZE (innermode))
+ && multiple_p (bitnum, GET_MODE_BITSIZE (innermode), &pos))
{
- struct expand_operand ops[3];
+ class expand_operand ops[3];
enum insn_code icode = optab_handler (vec_set_optab, outermode);
- int pos = bitnum / GET_MODE_BITSIZE (innermode);
create_fixed_operand (&ops[0], op0);
create_input_operand (&ops[1], value, innermode);
/* If the target is a register, overwriting the entire object, or storing
a full-word or multi-word field can be done with just a SUBREG. */
if (!MEM_P (op0)
- && bitsize == GET_MODE_BITSIZE (fieldmode)
- && ((bitsize == GET_MODE_BITSIZE (GET_MODE (op0)) && bitnum == 0)
- || (bitsize % BITS_PER_WORD == 0 && bitnum % BITS_PER_WORD == 0)))
+ && known_eq (bitsize, GET_MODE_BITSIZE (fieldmode)))
{
/* Use the subreg machinery either to narrow OP0 to the required
words or to cope with mode punning between equal-sized modes.
In the latter case, use subreg on the rhs side, not lhs. */
rtx sub;
-
- if (bitsize == GET_MODE_BITSIZE (GET_MODE (op0)))
+ HOST_WIDE_INT regnum;
+ poly_uint64 regsize = REGMODE_NATURAL_SIZE (GET_MODE (op0));
+ if (known_eq (bitnum, 0U)
+ && known_eq (bitsize, GET_MODE_BITSIZE (GET_MODE (op0))))
{
sub = simplify_gen_subreg (GET_MODE (op0), value, fieldmode, 0);
if (sub)
return true;
}
}
- else
+ else if (constant_multiple_p (bitnum, regsize * BITS_PER_UNIT, ®num)
+ && multiple_p (bitsize, regsize * BITS_PER_UNIT))
{
sub = simplify_gen_subreg (fieldmode, op0, GET_MODE (op0),
- bitnum / BITS_PER_UNIT);
+ regnum * regsize);
if (sub)
{
if (reverse)
/* If the target is memory, storing any naturally aligned field can be
done with a simple store. For targets that support fast unaligned
memory, any naturally sized, unit aligned field can be done directly. */
- if (simple_mem_bitfield_p (op0, bitsize, bitnum, fieldmode))
+ poly_uint64 bytenum;
+ if (simple_mem_bitfield_p (op0, bitsize, bitnum, fieldmode, &bytenum))
{
- op0 = adjust_bitfield_address (op0, fieldmode, bitnum / BITS_PER_UNIT);
+ op0 = adjust_bitfield_address (op0, fieldmode, bytenum);
if (reverse)
value = flip_storage_order (fieldmode, value);
emit_move_insn (op0, value);
return true;
}
+ /* It's possible we'll need to handle other cases here for
+ polynomial bitnum and bitsize. */
+
+ /* From here on we need to be looking at a fixed-size insertion. */
+ unsigned HOST_WIDE_INT ibitsize = bitsize.to_constant ();
+ unsigned HOST_WIDE_INT ibitnum = bitnum.to_constant ();
+
/* Make sure we are playing with integral modes. Pun with subregs
if we aren't. This must come after the entire register case above,
since that case is valid for any mode. The following cases are only
if (MEM_P (op0))
op0 = adjust_bitfield_address_size (op0, op0_mode.else_blk (),
0, MEM_SIZE (op0));
+ else if (!op0_mode.exists ())
+ {
+ if (ibitnum == 0
+ && known_eq (ibitsize, GET_MODE_BITSIZE (GET_MODE (op0)))
+ && MEM_P (value)
+ && !reverse)
+ {
+ value = adjust_address (value, GET_MODE (op0), 0);
+ emit_move_insn (op0, value);
+ return true;
+ }
+ if (!fallback_p)
+ return false;
+ rtx temp = assign_stack_temp (GET_MODE (op0),
+ GET_MODE_SIZE (GET_MODE (op0)));
+ emit_move_insn (temp, op0);
+ store_bit_field_1 (temp, bitsize, bitnum, 0, 0, fieldmode, value,
+ reverse, fallback_p);
+ emit_move_insn (op0, temp);
+ return true;
+ }
else
op0 = gen_lowpart (op0_mode.require (), op0);
}
+ return store_integral_bit_field (op0, op0_mode, ibitsize, ibitnum,
+ bitregion_start, bitregion_end,
+ fieldmode, value, reverse, fallback_p);
+}
+
+/* Subroutine of store_bit_field_1, with the same arguments, except
+ that BITSIZE and BITNUM are constant. Handle cases specific to
+ integral modes. If OP0_MODE is defined, it is the mode of OP0,
+ otherwise OP0 is a BLKmode MEM. */
+
+static bool
+store_integral_bit_field (rtx op0, opt_scalar_int_mode op0_mode,
+ unsigned HOST_WIDE_INT bitsize,
+ unsigned HOST_WIDE_INT bitnum,
+ poly_uint64 bitregion_start,
+ poly_uint64 bitregion_end,
+ machine_mode fieldmode,
+ rtx value, bool reverse, bool fallback_p)
+{
/* Storing an lsb-aligned field in a register
can be done with a movstrict instruction. */
if (!MEM_P (op0)
&& !reverse
- && lowpart_bit_field_p (bitnum, bitsize, GET_MODE (op0))
- && bitsize == GET_MODE_BITSIZE (fieldmode)
+ && lowpart_bit_field_p (bitnum, bitsize, op0_mode.require ())
+ && known_eq (bitsize, GET_MODE_BITSIZE (fieldmode))
&& optab_handler (movstrict_optab, fieldmode) != CODE_FOR_nothing)
{
- struct expand_operand ops[2];
+ class expand_operand ops[2];
enum insn_code icode = optab_handler (movstrict_optab, fieldmode);
rtx arg0 = op0;
unsigned HOST_WIDE_INT subreg_off;
However, only do that if the value is not BLKmode. */
const bool backwards = WORDS_BIG_ENDIAN && fieldmode != BLKmode;
- unsigned int nwords = (bitsize + (BITS_PER_WORD - 1)) / BITS_PER_WORD;
- unsigned int i;
+ const int nwords = (bitsize + (BITS_PER_WORD - 1)) / BITS_PER_WORD;
rtx_insn *last;
/* This is the mode we must force value to, so that there will be enough
subwords to extract. Note that fieldmode will often (always?) be
VOIDmode, because that is what store_field uses to indicate that this
is a bit field, but passing VOIDmode to operand_subword_force
- is not allowed. */
- fieldmode = GET_MODE (value);
- if (fieldmode == VOIDmode)
- fieldmode = smallest_int_mode_for_size (nwords * BITS_PER_WORD);
+ is not allowed.
+
+ The mode must be fixed-size, since insertions into variable-sized
+ objects are meant to be handled before calling this function. */
+ fixed_size_mode value_mode = as_a <fixed_size_mode> (GET_MODE (value));
+ if (value_mode == VOIDmode)
+ value_mode = smallest_int_mode_for_size (nwords * BITS_PER_WORD);
last = get_last_insn ();
- for (i = 0; i < nwords; i++)
+ for (int i = 0; i < nwords; i++)
{
- /* If I is 0, use the low-order word in both field and target;
- if I is 1, use the next to lowest word; and so on. */
- unsigned int wordnum = (backwards
- ? GET_MODE_SIZE (fieldmode) / UNITS_PER_WORD
- - i - 1
- : i);
- unsigned int bit_offset = (backwards ^ reverse
- ? MAX ((int) bitsize - ((int) i + 1)
- * BITS_PER_WORD,
- 0)
- : (int) i * BITS_PER_WORD);
- rtx value_word = operand_subword_force (value, wordnum, fieldmode);
- unsigned HOST_WIDE_INT new_bitsize =
- MIN (BITS_PER_WORD, bitsize - i * BITS_PER_WORD);
-
- /* If the remaining chunk doesn't have full wordsize we have
- to make sure that for big-endian machines the higher order
- bits are used. */
- if (new_bitsize < BITS_PER_WORD && BYTES_BIG_ENDIAN && !backwards)
- value_word = simplify_expand_binop (word_mode, lshr_optab,
- value_word,
- GEN_INT (BITS_PER_WORD
- - new_bitsize),
- NULL_RTX, true,
- OPTAB_LIB_WIDEN);
+ /* Number of bits to be stored in this iteration, i.e. BITS_PER_WORD
+ except maybe for the last iteration. */
+ const unsigned HOST_WIDE_INT new_bitsize
+ = MIN (BITS_PER_WORD, bitsize - i * BITS_PER_WORD);
+ /* Bit offset from the starting bit number in the target. */
+ const unsigned int bit_offset
+ = backwards ^ reverse
+ ? MAX ((int) bitsize - (i + 1) * BITS_PER_WORD, 0)
+ : i * BITS_PER_WORD;
+ /* Starting word number in the value. */
+ const unsigned int wordnum
+ = backwards
+ ? GET_MODE_SIZE (value_mode) / UNITS_PER_WORD - (i + 1)
+ : i;
+ /* The chunk of the value in word_mode. We use bit-field extraction
+ in BLKmode to handle unaligned memory references and to shift the
+ last chunk right on big-endian machines if need be. */
+ rtx value_word
+ = fieldmode == BLKmode
+ ? extract_bit_field (value, new_bitsize, wordnum * BITS_PER_WORD,
+ 1, NULL_RTX, word_mode, word_mode, false,
+ NULL)
+ : operand_subword_force (value, wordnum, value_mode);
if (!store_bit_field_1 (op0, new_bitsize,
bitnum + bit_offset,
integer of the corresponding size. This can occur on a machine
with 64 bit registers that uses SFmode for float. It can also
occur for unaligned float or complex fields. */
- orig_value = value;
+ rtx orig_value = value;
scalar_int_mode value_mode;
if (GET_MODE (value) == VOIDmode)
/* By this point we've dealt with values that are bigger than a word,
If REVERSE is true, the store is to be done in reverse order. */
void
-store_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
- unsigned HOST_WIDE_INT bitnum,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end,
+store_bit_field (rtx str_rtx, poly_uint64 bitsize, poly_uint64 bitnum,
+ poly_uint64 bitregion_start, poly_uint64 bitregion_end,
machine_mode fieldmode,
rtx value, bool reverse)
{
/* Handle -fstrict-volatile-bitfields in the cases where it applies. */
+ unsigned HOST_WIDE_INT ibitsize = 0, ibitnum = 0;
scalar_int_mode int_mode;
- if (is_a <scalar_int_mode> (fieldmode, &int_mode)
- && strict_volatile_bitfield_p (str_rtx, bitsize, bitnum, int_mode,
+ if (bitsize.is_constant (&ibitsize)
+ && bitnum.is_constant (&ibitnum)
+ && is_a <scalar_int_mode> (fieldmode, &int_mode)
+ && strict_volatile_bitfield_p (str_rtx, ibitsize, ibitnum, int_mode,
bitregion_start, bitregion_end))
{
/* Storing of a full word can be done with a simple store.
We know here that the field can be accessed with one single
instruction. For targets that support unaligned memory,
an unaligned access may be necessary. */
- if (bitsize == GET_MODE_BITSIZE (int_mode))
+ if (ibitsize == GET_MODE_BITSIZE (int_mode))
{
str_rtx = adjust_bitfield_address (str_rtx, int_mode,
- bitnum / BITS_PER_UNIT);
+ ibitnum / BITS_PER_UNIT);
if (reverse)
value = flip_storage_order (int_mode, value);
- gcc_assert (bitnum % BITS_PER_UNIT == 0);
+ gcc_assert (ibitnum % BITS_PER_UNIT == 0);
emit_move_insn (str_rtx, value);
}
else
{
rtx temp;
- str_rtx = narrow_bit_field_mem (str_rtx, int_mode, bitsize, bitnum,
- &bitnum);
- gcc_assert (bitnum + bitsize <= GET_MODE_BITSIZE (int_mode));
+ str_rtx = narrow_bit_field_mem (str_rtx, int_mode, ibitsize,
+ ibitnum, &ibitnum);
+ gcc_assert (ibitnum + ibitsize <= GET_MODE_BITSIZE (int_mode));
temp = copy_to_reg (str_rtx);
- if (!store_bit_field_1 (temp, bitsize, bitnum, 0, 0,
+ if (!store_bit_field_1 (temp, ibitsize, ibitnum, 0, 0,
int_mode, value, reverse, true))
gcc_unreachable ();
/* Under the C++0x memory model, we must not touch bits outside the
bit region. Adjust the address to start at the beginning of the
bit region. */
- if (MEM_P (str_rtx) && bitregion_start > 0)
+ if (MEM_P (str_rtx) && maybe_ne (bitregion_start, 0U))
{
scalar_int_mode best_mode;
machine_mode addr_mode = VOIDmode;
- HOST_WIDE_INT offset, size;
- gcc_assert ((bitregion_start % BITS_PER_UNIT) == 0);
-
- offset = bitregion_start / BITS_PER_UNIT;
+ poly_uint64 offset = exact_div (bitregion_start, BITS_PER_UNIT);
bitnum -= bitregion_start;
- size = (bitnum + bitsize + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
+ poly_int64 size = bits_to_bytes_round_up (bitnum + bitsize);
bitregion_end -= bitregion_start;
bitregion_start = 0;
- if (get_best_mode (bitsize, bitnum,
- bitregion_start, bitregion_end,
- MEM_ALIGN (str_rtx), INT_MAX,
- MEM_VOLATILE_P (str_rtx), &best_mode))
+ if (bitsize.is_constant (&ibitsize)
+ && bitnum.is_constant (&ibitnum)
+ && get_best_mode (ibitsize, ibitnum,
+ bitregion_start, bitregion_end,
+ MEM_ALIGN (str_rtx), INT_MAX,
+ MEM_VOLATILE_P (str_rtx), &best_mode))
addr_mode = best_mode;
str_rtx = adjust_bitfield_address_size (str_rtx, addr_mode,
offset, size);
store_fixed_bit_field (rtx op0, opt_scalar_int_mode op0_mode,
unsigned HOST_WIDE_INT bitsize,
unsigned HOST_WIDE_INT bitnum,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end,
+ poly_uint64 bitregion_start, poly_uint64 bitregion_end,
rtx value, scalar_int_mode value_mode, bool reverse)
{
/* There is a case not handled here:
store_split_bit_field (rtx op0, opt_scalar_int_mode op0_mode,
unsigned HOST_WIDE_INT bitsize,
unsigned HOST_WIDE_INT bitpos,
- unsigned HOST_WIDE_INT bitregion_start,
- unsigned HOST_WIDE_INT bitregion_end,
+ poly_uint64 bitregion_start, poly_uint64 bitregion_end,
rtx value, scalar_int_mode value_mode, bool reverse)
{
unsigned int unit, total_bits, bitsdone = 0;
UNIT close to the end of the region as needed. If op0 is a REG
or SUBREG of REG, don't do this, as there can't be data races
on a register and we can expand shorter code in some cases. */
- if (bitregion_end
+ if (maybe_ne (bitregion_end, 0U)
&& unit > BITS_PER_UNIT
- && bitpos + bitsdone - thispos + unit > bitregion_end + 1
+ && maybe_gt (bitpos + bitsdone - thispos + unit, bitregion_end + 1)
&& !REG_P (op0)
&& (GET_CODE (op0) != SUBREG || !REG_P (SUBREG_REG (op0))))
{
int unsignedp, rtx target,
machine_mode mode, machine_mode tmode)
{
- struct expand_operand ops[4];
+ class expand_operand ops[4];
rtx spec_target = target;
rtx spec_target_subreg = 0;
scalar_int_mode ext_mode = extv->field_mode;
return NULL_RTX;
}
+/* See whether it would be valid to extract the part of OP0 described
+ by BITNUM and BITSIZE into a value of mode MODE using a subreg
+ operation. Return the subreg if so, otherwise return null. */
+
+static rtx
+extract_bit_field_as_subreg (machine_mode mode, rtx op0,
+ poly_uint64 bitsize, poly_uint64 bitnum)
+{
+ poly_uint64 bytenum;
+ if (multiple_p (bitnum, BITS_PER_UNIT, &bytenum)
+ && known_eq (bitsize, GET_MODE_BITSIZE (mode))
+ && lowpart_bit_field_p (bitnum, bitsize, GET_MODE (op0))
+ && TRULY_NOOP_TRUNCATION_MODES_P (mode, GET_MODE (op0)))
+ return simplify_gen_subreg (mode, op0, GET_MODE (op0), bytenum);
+ return NULL_RTX;
+}
+
/* A subroutine of extract_bit_field, with the same arguments.
If FALLBACK_P is true, fall back to extract_fixed_bit_field
if we can find no other means of implementing the operation.
if FALLBACK_P is false, return NULL instead. */
static rtx
-extract_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
- unsigned HOST_WIDE_INT bitnum, int unsignedp, rtx target,
- machine_mode mode, machine_mode tmode,
- bool reverse, bool fallback_p, rtx *alt_rtl)
+extract_bit_field_1 (rtx str_rtx, poly_uint64 bitsize, poly_uint64 bitnum,
+ int unsignedp, rtx target, machine_mode mode,
+ machine_mode tmode, bool reverse, bool fallback_p,
+ rtx *alt_rtl)
{
rtx op0 = str_rtx;
machine_mode mode1;
/* If we have an out-of-bounds access to a register, just return an
uninitialized register of the required mode. This can occur if the
source code contains an out-of-bounds access to a small array. */
- if (REG_P (op0) && bitnum >= GET_MODE_BITSIZE (GET_MODE (op0)))
+ if (REG_P (op0) && known_ge (bitnum, GET_MODE_BITSIZE (GET_MODE (op0))))
return gen_reg_rtx (tmode);
if (REG_P (op0)
&& mode == GET_MODE (op0)
- && bitnum == 0
- && bitsize == GET_MODE_BITSIZE (GET_MODE (op0)))
+ && known_eq (bitnum, 0U)
+ && known_eq (bitsize, GET_MODE_BITSIZE (GET_MODE (op0))))
{
if (reverse)
op0 = flip_storage_order (mode, op0);
if (VECTOR_MODE_P (GET_MODE (op0))
&& !MEM_P (op0)
&& VECTOR_MODE_P (tmode)
- && GET_MODE_SIZE (GET_MODE (op0)) > GET_MODE_SIZE (tmode))
+ && known_eq (bitsize, GET_MODE_BITSIZE (tmode))
+ && maybe_gt (GET_MODE_SIZE (GET_MODE (op0)), GET_MODE_SIZE (tmode)))
{
machine_mode new_mode = GET_MODE (op0);
if (GET_MODE_INNER (new_mode) != GET_MODE_INNER (tmode))
{
scalar_mode inner_mode = GET_MODE_INNER (tmode);
- unsigned int nunits = (GET_MODE_BITSIZE (GET_MODE (op0))
- / GET_MODE_UNIT_BITSIZE (tmode));
- if (!mode_for_vector (inner_mode, nunits).exists (&new_mode)
- || !VECTOR_MODE_P (new_mode)
- || GET_MODE_SIZE (new_mode) != GET_MODE_SIZE (GET_MODE (op0))
- || GET_MODE_INNER (new_mode) != GET_MODE_INNER (tmode)
- || !targetm.vector_mode_supported_p (new_mode))
+ poly_uint64 nunits;
+ if (!multiple_p (GET_MODE_BITSIZE (GET_MODE (op0)),
+ GET_MODE_UNIT_BITSIZE (tmode), &nunits)
+ || !related_vector_mode (tmode, inner_mode,
+ nunits).exists (&new_mode)
+ || maybe_ne (GET_MODE_SIZE (new_mode),
+ GET_MODE_SIZE (GET_MODE (op0))))
new_mode = VOIDmode;
}
+ poly_uint64 pos;
if (new_mode != VOIDmode
&& (convert_optab_handler (vec_extract_optab, new_mode, tmode)
!= CODE_FOR_nothing)
- && ((bitnum + bitsize - 1) / GET_MODE_BITSIZE (tmode)
- == bitnum / GET_MODE_BITSIZE (tmode)))
+ && multiple_p (bitnum, GET_MODE_BITSIZE (tmode), &pos))
{
- struct expand_operand ops[3];
+ class expand_operand ops[3];
machine_mode outermode = new_mode;
machine_mode innermode = tmode;
enum insn_code icode
= convert_optab_handler (vec_extract_optab, outermode, innermode);
- unsigned HOST_WIDE_INT pos = bitnum / GET_MODE_BITSIZE (innermode);
if (new_mode != GET_MODE (op0))
op0 = gen_lowpart (new_mode, op0);
new_mode = MIN_MODE_VECTOR_INT;
FOR_EACH_MODE_FROM (new_mode, new_mode)
- if (GET_MODE_SIZE (new_mode) == GET_MODE_SIZE (GET_MODE (op0))
- && GET_MODE_UNIT_SIZE (new_mode) == GET_MODE_SIZE (tmode)
+ if (known_eq (GET_MODE_SIZE (new_mode), GET_MODE_SIZE (GET_MODE (op0)))
+ && known_eq (GET_MODE_UNIT_SIZE (new_mode), GET_MODE_SIZE (tmode))
&& targetm.vector_mode_supported_p (new_mode))
break;
if (new_mode != VOIDmode)
}
/* Use vec_extract patterns for extracting parts of vectors whenever
- available. */
+ available. If that fails, see whether the current modes and bitregion
+ give a natural subreg. */
machine_mode outermode = GET_MODE (op0);
- scalar_mode innermode = GET_MODE_INNER (outermode);
- if (VECTOR_MODE_P (outermode)
- && !MEM_P (op0)
- && (convert_optab_handler (vec_extract_optab, outermode, innermode)
- != CODE_FOR_nothing)
- && ((bitnum + bitsize - 1) / GET_MODE_BITSIZE (innermode)
- == bitnum / GET_MODE_BITSIZE (innermode)))
+ if (VECTOR_MODE_P (outermode) && !MEM_P (op0))
{
- struct expand_operand ops[3];
+ scalar_mode innermode = GET_MODE_INNER (outermode);
enum insn_code icode
= convert_optab_handler (vec_extract_optab, outermode, innermode);
- unsigned HOST_WIDE_INT pos = bitnum / GET_MODE_BITSIZE (innermode);
+ poly_uint64 pos;
+ if (icode != CODE_FOR_nothing
+ && known_eq (bitsize, GET_MODE_BITSIZE (innermode))
+ && multiple_p (bitnum, GET_MODE_BITSIZE (innermode), &pos))
+ {
+ class expand_operand ops[3];
- create_output_operand (&ops[0], target, innermode);
- ops[0].target = 1;
- create_input_operand (&ops[1], op0, outermode);
- create_integer_operand (&ops[2], pos);
- if (maybe_expand_insn (icode, 3, ops))
+ create_output_operand (&ops[0], target, innermode);
+ ops[0].target = 1;
+ create_input_operand (&ops[1], op0, outermode);
+ create_integer_operand (&ops[2], pos);
+ if (maybe_expand_insn (icode, 3, ops))
+ {
+ if (alt_rtl && ops[0].target)
+ *alt_rtl = target;
+ target = ops[0].value;
+ if (GET_MODE (target) != mode)
+ return gen_lowpart (tmode, target);
+ return target;
+ }
+ }
+ /* Using subregs is useful if we're extracting one register vector
+ from a multi-register vector. extract_bit_field_as_subreg checks
+ for valid bitsize and bitnum, so we don't need to do that here. */
+ if (VECTOR_MODE_P (mode))
{
- if (alt_rtl && ops[0].target)
- *alt_rtl = target;
- target = ops[0].value;
- if (GET_MODE (target) != mode)
- return gen_lowpart (tmode, target);
- return target;
+ rtx sub = extract_bit_field_as_subreg (mode, op0, bitsize, bitnum);
+ if (sub)
+ return sub;
}
}
}
else
{
- HOST_WIDE_INT size = GET_MODE_SIZE (GET_MODE (op0));
+ poly_int64 size = GET_MODE_SIZE (GET_MODE (op0));
rtx mem = assign_stack_temp (GET_MODE (op0), size);
emit_move_insn (mem, op0);
op0 = adjust_bitfield_address_size (mem, BLKmode, 0, size);
/* Extraction of a full MODE1 value can be done with a subreg as long
as the least significant bit of the value is the least significant
bit of either OP0 or a word of OP0. */
- if (!MEM_P (op0)
- && !reverse
- && lowpart_bit_field_p (bitnum, bitsize, op0_mode.require ())
- && bitsize == GET_MODE_BITSIZE (mode1)
- && TRULY_NOOP_TRUNCATION_MODES_P (mode1, op0_mode.require ()))
+ if (!MEM_P (op0) && !reverse)
{
- rtx sub = simplify_gen_subreg (mode1, op0, op0_mode.require (),
- bitnum / BITS_PER_UNIT);
+ rtx sub = extract_bit_field_as_subreg (mode1, op0, bitsize, bitnum);
if (sub)
return convert_extracted_bit_field (sub, mode, tmode, unsignedp);
}
/* Extraction of a full MODE1 value can be done with a load as long as
the field is on a byte boundary and is sufficiently aligned. */
- if (simple_mem_bitfield_p (op0, bitsize, bitnum, mode1))
+ poly_uint64 bytenum;
+ if (simple_mem_bitfield_p (op0, bitsize, bitnum, mode1, &bytenum))
{
- op0 = adjust_bitfield_address (op0, mode1, bitnum / BITS_PER_UNIT);
+ op0 = adjust_bitfield_address (op0, mode1, bytenum);
if (reverse)
op0 = flip_storage_order (mode1, op0);
return convert_extracted_bit_field (op0, mode, tmode, unsignedp);
}
+ /* If we have a memory source and a non-constant bit offset, restrict
+ the memory to the referenced bytes. This is a worst-case fallback
+ but is useful for things like vector booleans. */
+ if (MEM_P (op0) && !bitnum.is_constant ())
+ {
+ bytenum = bits_to_bytes_round_down (bitnum);
+ bitnum = num_trailing_bits (bitnum);
+ poly_uint64 bytesize = bits_to_bytes_round_up (bitnum + bitsize);
+ op0 = adjust_bitfield_address_size (op0, BLKmode, bytenum, bytesize);
+ op0_mode = opt_scalar_int_mode ();
+ }
+
+ /* It's possible we'll need to handle other cases here for
+ polynomial bitnum and bitsize. */
+
+ /* From here on we need to be looking at a fixed-size insertion. */
+ return extract_integral_bit_field (op0, op0_mode, bitsize.to_constant (),
+ bitnum.to_constant (), unsignedp,
+ target, mode, tmode, reverse, fallback_p);
+}
+
+/* Subroutine of extract_bit_field_1, with the same arguments, except
+ that BITSIZE and BITNUM are constant. Handle cases specific to
+ integral modes. If OP0_MODE is defined, it is the mode of OP0,
+ otherwise OP0 is a BLKmode MEM. */
+
+static rtx
+extract_integral_bit_field (rtx op0, opt_scalar_int_mode op0_mode,
+ unsigned HOST_WIDE_INT bitsize,
+ unsigned HOST_WIDE_INT bitnum, int unsignedp,
+ rtx target, machine_mode mode, machine_mode tmode,
+ bool reverse, bool fallback_p)
+{
/* Handle fields bigger than a word. */
if (bitsize > BITS_PER_WORD)
/* In case we're about to clobber a base register or something
(see gcc.c-torture/execute/20040625-1.c). */
- if (reg_mentioned_p (target, str_rtx))
+ if (reg_mentioned_p (target, op0))
target = gen_reg_rtx (mode);
/* Indicate for flow that the entire target reg is being set. */
emit_clobber (target);
+ /* The mode must be fixed-size, since extract_bit_field_1 handles
+ extractions from variable-sized objects before calling this
+ function. */
+ unsigned int target_size
+ = GET_MODE_SIZE (GET_MODE (target)).to_constant ();
last = get_last_insn ();
for (i = 0; i < nwords; i++)
{
if I is 1, use the next to lowest word; and so on. */
/* Word number in TARGET to use. */
unsigned int wordnum
- = (backwards
- ? GET_MODE_SIZE (GET_MODE (target)) / UNITS_PER_WORD - i - 1
- : i);
+ = (backwards ? target_size / UNITS_PER_WORD - i - 1 : i);
/* Offset from start of field in OP0. */
unsigned int bit_offset = (backwards ^ reverse
? MAX ((int) bitsize - ((int) i + 1)
{
/* Unless we've filled TARGET, the upper regs in a multi-reg value
need to be zero'd out. */
- if (GET_MODE_SIZE (GET_MODE (target)) > nwords * UNITS_PER_WORD)
+ if (target_size > nwords * UNITS_PER_WORD)
{
unsigned int i, total_words;
- total_words = GET_MODE_SIZE (GET_MODE (target)) / UNITS_PER_WORD;
+ total_words = target_size / UNITS_PER_WORD;
for (i = nwords; i < total_words; i++)
emit_move_insn
(operand_subword (target,
If a TARGET is specified and we can store in it at no extra cost,
we do so, and return TARGET.
Otherwise, we return a REG of mode TMODE or MODE, with TMODE preferred
- if they are equally easy. */
+ if they are equally easy.
+
+ If the result can be stored at TARGET, and ALT_RTL is non-NULL,
+ then *ALT_RTL is set to TARGET (before legitimziation). */
rtx
-extract_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
- unsigned HOST_WIDE_INT bitnum, int unsignedp, rtx target,
- machine_mode mode, machine_mode tmode, bool reverse,
- rtx *alt_rtl)
+extract_bit_field (rtx str_rtx, poly_uint64 bitsize, poly_uint64 bitnum,
+ int unsignedp, rtx target, machine_mode mode,
+ machine_mode tmode, bool reverse, rtx *alt_rtl)
{
machine_mode mode1;
/* Handle -fstrict-volatile-bitfields in the cases where it applies. */
- if (GET_MODE_BITSIZE (GET_MODE (str_rtx)) > 0)
+ if (maybe_ne (GET_MODE_BITSIZE (GET_MODE (str_rtx)), 0))
mode1 = GET_MODE (str_rtx);
- else if (target && GET_MODE_BITSIZE (GET_MODE (target)) > 0)
+ else if (target && maybe_ne (GET_MODE_BITSIZE (GET_MODE (target)), 0))
mode1 = GET_MODE (target);
else
mode1 = tmode;
+ unsigned HOST_WIDE_INT ibitsize, ibitnum;
scalar_int_mode int_mode;
- if (is_a <scalar_int_mode> (mode1, &int_mode)
- && strict_volatile_bitfield_p (str_rtx, bitsize, bitnum, int_mode, 0, 0))
+ if (bitsize.is_constant (&ibitsize)
+ && bitnum.is_constant (&ibitnum)
+ && is_a <scalar_int_mode> (mode1, &int_mode)
+ && strict_volatile_bitfield_p (str_rtx, ibitsize, ibitnum,
+ int_mode, 0, 0))
{
/* Extraction of a full INT_MODE value can be done with a simple load.
We know here that the field can be accessed with one single
instruction. For targets that support unaligned memory,
an unaligned access may be necessary. */
- if (bitsize == GET_MODE_BITSIZE (int_mode))
+ if (ibitsize == GET_MODE_BITSIZE (int_mode))
{
rtx result = adjust_bitfield_address (str_rtx, int_mode,
- bitnum / BITS_PER_UNIT);
+ ibitnum / BITS_PER_UNIT);
if (reverse)
result = flip_storage_order (int_mode, result);
- gcc_assert (bitnum % BITS_PER_UNIT == 0);
+ gcc_assert (ibitnum % BITS_PER_UNIT == 0);
return convert_extracted_bit_field (result, mode, tmode, unsignedp);
}
- str_rtx = narrow_bit_field_mem (str_rtx, int_mode, bitsize, bitnum,
- &bitnum);
- gcc_assert (bitnum + bitsize <= GET_MODE_BITSIZE (int_mode));
+ str_rtx = narrow_bit_field_mem (str_rtx, int_mode, ibitsize, ibitnum,
+ &ibitnum);
+ gcc_assert (ibitnum + ibitsize <= GET_MODE_BITSIZE (int_mode));
str_rtx = copy_to_reg (str_rtx);
+ return extract_bit_field_1 (str_rtx, ibitsize, ibitnum, unsignedp,
+ target, mode, tmode, reverse, true, alt_rtl);
}
return extract_bit_field_1 (str_rtx, bitsize, bitnum, unsignedp,
/* simplify_gen_subreg can't be used here, as if simplify_subreg
fails, it will happily create (subreg (symbol_ref)) or similar
invalid SUBREGs. */
- unsigned int byte = subreg_lowpart_offset (mode, src_mode);
+ poly_uint64 byte = subreg_lowpart_offset (mode, src_mode);
rtx ret = simplify_subreg (mode, src, src_mode, byte);
if (ret)
return ret;
if (GET_MODE_CLASS (mode) == MODE_CC || GET_MODE_CLASS (src_mode) == MODE_CC)
return NULL_RTX;
- if (GET_MODE_BITSIZE (mode) == GET_MODE_BITSIZE (src_mode)
+ if (known_eq (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (src_mode))
&& targetm.modes_tieable_p (mode, src_mode))
{
rtx x = gen_lowpart_common (mode, src);
return NULL_RTX;
src = gen_lowpart (src_int_mode, src);
+ if (!validate_subreg (int_mode, src_int_mode, src,
+ subreg_lowpart_offset (int_mode, src_int_mode)))
+ return NULL_RTX;
+
src = convert_modes (int_mode, src_int_mode, src, true);
src = gen_lowpart (mode, src);
return src;
if (CONST_INT_P (op1)
&& ((unsigned HOST_WIDE_INT) INTVAL (op1) >=
(unsigned HOST_WIDE_INT) GET_MODE_BITSIZE (scalar_mode)))
- op1 = GEN_INT ((unsigned HOST_WIDE_INT) INTVAL (op1)
- % GET_MODE_BITSIZE (scalar_mode));
+ op1 = gen_int_shift_amount (mode,
+ (unsigned HOST_WIDE_INT) INTVAL (op1)
+ % GET_MODE_BITSIZE (scalar_mode));
else if (GET_CODE (op1) == SUBREG
&& subreg_lowpart_p (op1)
&& SCALAR_INT_MODE_P (GET_MODE (SUBREG_REG (op1)))
&& IN_RANGE (INTVAL (op1), GET_MODE_BITSIZE (scalar_mode) / 2 + left,
GET_MODE_BITSIZE (scalar_mode) - 1))
{
- op1 = GEN_INT (GET_MODE_BITSIZE (scalar_mode) - INTVAL (op1));
+ op1 = gen_int_shift_amount (mode, (GET_MODE_BITSIZE (scalar_mode)
+ - INTVAL (op1)));
left = !left;
code = left ? LROTATE_EXPR : RROTATE_EXPR;
}
&& CONST_INT_P (op1)
&& INTVAL (op1) == BITS_PER_UNIT
&& GET_MODE_SIZE (scalar_mode) == 2
- && optab_handler (bswap_optab, HImode) != CODE_FOR_nothing)
- return expand_unop (HImode, bswap_optab, shifted, NULL_RTX,
- unsignedp);
+ && optab_handler (bswap_optab, mode) != CODE_FOR_nothing)
+ return expand_unop (mode, bswap_optab, shifted, NULL_RTX, unsignedp);
if (op1 == const0_rtx)
return shifted;
if (op1 == const0_rtx)
return shifted;
else if (CONST_INT_P (op1))
- other_amount = GEN_INT (GET_MODE_BITSIZE (scalar_mode)
- - INTVAL (op1));
+ other_amount = gen_int_shift_amount
+ (mode, GET_MODE_BITSIZE (scalar_mode) - INTVAL (op1));
else
{
other_amount
rtx
expand_shift (enum tree_code code, machine_mode mode, rtx shifted,
- int amount, rtx target, int unsignedp)
+ poly_int64 amount, rtx target, int unsignedp)
{
- return expand_shift_1 (code, mode,
- shifted, GEN_INT (amount), target, unsignedp);
+ return expand_shift_1 (code, mode, shifted,
+ gen_int_shift_amount (mode, amount),
+ target, unsignedp);
}
/* Likewise, but return 0 if that cannot be done. */
/* Write a REG_EQUAL note on the last insn so that we can cse
multiplication sequences. Note that if ACCUM is a SUBREG,
we've set the inner register and must properly indicate that. */
- tem = op0, nmode = mode;
- accum_inner = accum;
- if (GET_CODE (accum) == SUBREG)
+ tem = op0, nmode = mode;
+ accum_inner = accum;
+ if (GET_CODE (accum) == SUBREG)
{
accum_inner = SUBREG_REG (accum);
nmode = GET_MODE (accum_inner);
tem = gen_lowpart (nmode, op0);
}
- insn = get_last_insn ();
- set_dst_reg_note (insn, REG_EQUAL,
- gen_rtx_MULT (nmode, tem,
- gen_int_mode (val_so_far, nmode)),
- accum_inner);
+ /* Don't add a REG_EQUAL note if tem is a paradoxical SUBREG.
+ In that case, only the low bits of accum would be guaranteed to
+ be equal to the content of the REG_EQUAL note, the upper bits
+ can be anything. */
+ if (!paradoxical_subreg_p (tem))
+ {
+ insn = get_last_insn ();
+ wide_int wval_so_far
+ = wi::uhwi (val_so_far,
+ GET_MODE_PRECISION (as_a <scalar_mode> (nmode)));
+ rtx c = immed_wide_int_const (wval_so_far, nmode);
+ set_dst_reg_note (insn, REG_EQUAL, gen_rtx_MULT (nmode, tem, c),
+ accum_inner);
+ }
}
}
{
unsigned HOST_WIDE_INT mask = (HOST_WIDE_INT_1U << n) - 1;
*multiplier_ptr = mhigh.to_uhwi () & mask;
- return mhigh.to_uhwi () >= mask;
+ return mhigh.to_uhwi () > mask;
}
else
{
/* Emit code to multiply OP0 and OP1 (where OP1 is an integer constant),
putting the high half of the result in TARGET if that is convenient,
- and return where the result is. If the operation can not be performed,
+ and return where the result is. If the operation cannot be performed,
0 is returned.
MODE is the mode of operation and result.
{
HOST_WIDE_INT masklow = (HOST_WIDE_INT_1 << logd) - 1;
signmask = force_reg (mode, signmask);
- shift = GEN_INT (GET_MODE_BITSIZE (mode) - logd);
+ shift = gen_int_shift_amount (mode, GET_MODE_BITSIZE (mode) - logd);
/* Use the rtx_cost of a LSHIFTRT instruction to determine
which instruction sequence to use. If logical right shifts
HOST_WIDE_INT d = INTVAL (op1);
unsigned HOST_WIDE_INT abs_d;
+ /* Not prepared to handle division/remainder by
+ 0xffffffffffffffff8000000000000000 etc. */
+ if (d == HOST_WIDE_INT_MIN && size > HOST_BITS_PER_WIDE_INT)
+ break;
+
/* Since d might be INT_MIN, we have to cast to
unsigned HOST_WIDE_INT before negating to avoid
undefined signed overflow. */
|| (optab_handler (sdivmod_optab, int_mode)
!= CODE_FOR_nothing)))
;
- else if (EXACT_POWER_OF_2_OR_ZERO_P (abs_d)
- && (size <= HOST_BITS_PER_WIDE_INT
- || abs_d != (unsigned HOST_WIDE_INT) d))
+ else if (EXACT_POWER_OF_2_OR_ZERO_P (abs_d))
{
if (rem_flag)
{
case CONST_VECTOR:
{
- int units = CONST_VECTOR_NUNITS (x);
+ unsigned int npatterns = CONST_VECTOR_NPATTERNS (x);
+ unsigned int nelts_per_pattern = CONST_VECTOR_NELTS_PER_PATTERN (x);
tree itype = TREE_TYPE (type);
- int i;
/* Build a tree with vector elements. */
- tree_vector_builder elts (type, units, 1);
- for (i = 0; i < units; ++i)
+ tree_vector_builder elts (type, npatterns, nelts_per_pattern);
+ unsigned int count = elts.encoded_nelts ();
+ for (unsigned int i = 0; i < count; ++i)
{
rtx elt = CONST_VECTOR_ELT (x, i);
elts.quick_push (make_tree (itype, elt));
return fold_convert (type, make_tree (t, XEXP (x, 0)));
case CONST:
- {
- rtx op = XEXP (x, 0);
- if (GET_CODE (op) == VEC_DUPLICATE)
- {
- tree elt_tree = make_tree (TREE_TYPE (type), XEXP (op, 0));
- return build_vector_from_val (type, elt_tree);
- }
- return make_tree (type, op);
- }
+ return make_tree (type, XEXP (x, 0));
case SYMBOL_REF:
t = SYMBOL_REF_DECL (x);
/* fall through. */
default:
+ if (CONST_POLY_INT_P (x))
+ return wide_int_to_tree (t, const_poly_int_value (x));
+
t = build_decl (RTL_LOCATION (x), VAR_DECL, NULL_TREE, type);
/* If TYPE is a POINTER_TYPE, we might need to convert X from
int unsignedp, rtx x, rtx y, int normalizep,
machine_mode target_mode)
{
- struct expand_operand ops[4];
+ class expand_operand ops[4];
rtx op0, comparison, subtarget;
rtx_insn *last;
scalar_int_mode result_mode = targetm.cstore_mode (icode);
If STORE_FLAG_VALUE does not have the sign bit set when
interpreted in MODE, we can do this conversion as unsigned, which
is usually more efficient. */
- if (GET_MODE_SIZE (int_target_mode) > GET_MODE_SIZE (result_mode))
+ if (GET_MODE_PRECISION (int_target_mode) > GET_MODE_PRECISION (result_mode))
{
- convert_move (target, subtarget,
- val_signbit_known_clear_p (result_mode,
- STORE_FLAG_VALUE));
+ gcc_assert (GET_MODE_PRECISION (result_mode) != 1
+ || STORE_FLAG_VALUE == 1 || STORE_FLAG_VALUE == -1);
+
+ bool unsignedp = (STORE_FLAG_VALUE >= 0);
+ convert_move (target, subtarget, unsignedp);
+
op0 = target;
result_mode = int_target_mode;
}
if (mode == VOIDmode)
mode = GET_MODE (op0);
+ if (CONST_SCALAR_INT_P (op1))
+ canonicalize_comparison (mode, &code, &op1);
+
/* For some comparisons with 1 and -1, we can convert this to
comparisons with zero. This will often produce more opportunities for
store-flag insns. */
if (!HAVE_conditional_move)
return 0;
+ /* Do not turn a trapping comparison into a non-trapping one. */
+ if ((code != EQ && code != NE && code != UNEQ && code != LTGT)
+ && flag_trapping_math)
+ return 0;
+
/* Try using a setcc instruction for ORDERED/UNORDERED, followed by a
conditional move. */
tem = emit_store_flag_1 (subtarget, first_code, op0, op1, mode, 0,
if (tem != 0)
return tem;
+ /* If one operand is constant, make it the second one. Only do this
+ if the other operand is not constant as well. */
+ if (swap_commutative_operands_p (op0, op1))
+ {
+ std::swap (op0, op1);
+ code = swap_condition (code);
+ }
+
+ if (mode == VOIDmode)
+ mode = GET_MODE (op0);
+
if (!target)
target = gen_reg_rtx (word_mode);
return target;
}
+
+/* Helper function for canonicalize_cmp_for_target. Swap between inclusive
+ and exclusive ranges in order to create an equivalent comparison. See
+ canonicalize_cmp_for_target for the possible cases. */
+
+static enum rtx_code
+equivalent_cmp_code (enum rtx_code code)
+{
+ switch (code)
+ {
+ case GT:
+ return GE;
+ case GE:
+ return GT;
+ case LT:
+ return LE;
+ case LE:
+ return LT;
+ case GTU:
+ return GEU;
+ case GEU:
+ return GTU;
+ case LTU:
+ return LEU;
+ case LEU:
+ return LTU;
+
+ default:
+ return code;
+ }
+}
+
+/* Choose the more appropiate immediate in scalar integer comparisons. The
+ purpose of this is to end up with an immediate which can be loaded into a
+ register in fewer moves, if possible.
+
+ For each integer comparison there exists an equivalent choice:
+ i) a > b or a >= b + 1
+ ii) a <= b or a < b + 1
+ iii) a >= b or a > b - 1
+ iv) a < b or a <= b - 1
+
+ MODE is the mode of the first operand.
+ CODE points to the comparison code.
+ IMM points to the rtx containing the immediate. *IMM must satisfy
+ CONST_SCALAR_INT_P on entry and continues to satisfy CONST_SCALAR_INT_P
+ on exit. */
+
+void
+canonicalize_comparison (machine_mode mode, enum rtx_code *code, rtx *imm)
+{
+ if (!SCALAR_INT_MODE_P (mode))
+ return;
+
+ int to_add = 0;
+ enum signop sgn = unsigned_condition_p (*code) ? UNSIGNED : SIGNED;
+
+ /* Extract the immediate value from the rtx. */
+ wide_int imm_val = rtx_mode_t (*imm, mode);
+
+ if (*code == GT || *code == GTU || *code == LE || *code == LEU)
+ to_add = 1;
+ else if (*code == GE || *code == GEU || *code == LT || *code == LTU)
+ to_add = -1;
+ else
+ return;
+
+ /* Check for overflow/underflow in the case of signed values and
+ wrapping around in the case of unsigned values. If any occur
+ cancel the optimization. */
+ wi::overflow_type overflow = wi::OVF_NONE;
+ wide_int imm_modif;
+
+ if (to_add == 1)
+ imm_modif = wi::add (imm_val, 1, sgn, &overflow);
+ else
+ imm_modif = wi::sub (imm_val, 1, sgn, &overflow);
+
+ if (overflow)
+ return;
+
+ /* The following creates a pseudo; if we cannot do that, bail out. */
+ if (!can_create_pseudo_p ())
+ return;
+
+ rtx reg = gen_rtx_REG (mode, LAST_VIRTUAL_REGISTER + 1);
+ rtx new_imm = immed_wide_int_const (imm_modif, mode);
+
+ rtx_insn *old_rtx = gen_move_insn (reg, *imm);
+ rtx_insn *new_rtx = gen_move_insn (reg, new_imm);
+
+ /* Update the immediate and the code. */
+ if (insn_cost (old_rtx, true) > insn_cost (new_rtx, true))
+ {
+ *code = equivalent_cmp_code (*code);
+ *imm = new_imm;
+ }
+}
+
+
\f
/* Perform possibly multi-word comparison and conditional jump to LABEL
if ARG1 OP ARG2 true where ARG1 and ARG2 are of mode MODE. This is
projects / thirdparty / gcc.git / blobdiff