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i386: Simplify PARALLEL RTX scan in ix86_find_all_reg_use

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UNSPEC and UNSPEC_VOLATILE never store. Remove unnecessary checks and
simplify RTX scan in ix86_find_all_reg_use to scan only for SET RTX
in the PARALLEL.

gcc/ChangeLog:

	* config/i386/i386.cc (ix86_find_all_reg_use):
	Scan only for SET RTX in PARALLEL.
This commit is contained in:
Uros Bizjak 2025-02-17 20:47:14 +01:00
parent 09684c53bc
commit 565d4e7554
1 changed files with 3 additions and 25 deletions
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28
gcc/config/i386/i386.cc
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@ -8538,31 +8538,9 @@ ix86_find_all_reg_use (HARD_REG_SET &stack_slot_access,
for (int i = 0; i < XVECLEN (pat, 0); i++)
{
rtx exp = XVECEXP (pat, 0, i);
switch (GET_CODE (exp))
{
case ASM_OPERANDS:
case CLOBBER:
case PREFETCH:
case USE:
break;
case UNSPEC:
case UNSPEC_VOLATILE:
for (int j = XVECLEN (exp, 0) - 1; j >= 0; j--)
{
rtx x = XVECEXP (exp, 0, j);
if (GET_CODE (x) == SET)
ix86_find_all_reg_use_1 (x, stack_slot_access,
worklist);
}
break;
case SET:
ix86_find_all_reg_use_1 (exp, stack_slot_access,
worklist);
break;
default:
gcc_unreachable ();
break;
}
if (GET_CODE (exp) == SET)
ix86_find_all_reg_use_1 (exp, stack_slot_access, worklist);
}
}
}