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cprop_hardreg: Enable propagation of the stack pointer if possible

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Propagation of the stack pointer in cprop_hardreg is currenty
forbidden in all cases, due to maybe_mode_change returning NULL.
Relax this restriction and allow propagation when no mode change is
requested.

gcc/ChangeLog:

	* regcprop.cc (maybe_mode_change): Enable stack pointer
	propagation.
This commit is contained in:
Manolis Tsamis 2023-05-25 13:44:41 +02:00 • committed by Philipp Tomsich
parent 91fb8bdb39
commit 6a2e8dcbbd
1 changed files with 6 additions and 1 deletions
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7
gcc/regcprop.cc
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@ -422,7 +422,12 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
It's unclear if we need to do the same for other special registers. */ It's unclear if we need to do the same for other special registers. */
if (regno == STACK_POINTER_REGNUM) if (regno == STACK_POINTER_REGNUM)
return NULL_RTX; {
if (orig_mode == new_mode)
return stack_pointer_rtx;
else
return NULL_RTX;
}
if (orig_mode == new_mode) if (orig_mode == new_mode)
return gen_raw_REG (new_mode, regno); return gen_raw_REG (new_mode, regno);