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xtensa: Eliminate double MEMW insertions for volatile memory

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This patch makes avoid inserting a MEMW instruction before a load/store
nstruction with volatile memory reference if there is already a MEMW
immediately before it.

gcc/ChangeLog:

	* config/xtensa/xtensa.cc (print_operand):
	When outputting MEMW before the instruction, check if the previous
	instruction is already that.
This commit is contained in:
Takayuki 'January June' Suwa 2024-06-19 13:59:54 +09:00 • committed by Max Filippov
parent bcb9dad9f6
commit 0982552bc4
1 changed files with 11 additions and 1 deletions
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12
gcc/config/xtensa/xtensa.cc
View file

@ -3078,7 +3078,17 @@ print_operand (FILE *file, rtx x, int letter)
/* For a volatile memory reference, emit a MEMW before the
load or store. */
if (MEM_VOLATILE_P (x) && TARGET_SERIALIZE_VOLATILE)
fprintf (file, "memw\n\t");
{
rtx_insn *prev_insn
= prev_nonnote_nondebug_insn (current_output_insn);
rtx pat, src;
if (! (prev_insn && NONJUMP_INSN_P (prev_insn)
&& GET_CODE (pat = PATTERN (prev_insn)) == SET
&& GET_CODE (src = SET_SRC (pat)) == UNSPEC
&& XINT (src, 1) == UNSPEC_MEMW))
fprintf (file, "memw\n\t");
}
}
else
output_operand_lossage ("invalid %%v value");