[llvm] [AArch64] Add streaming-mode stack hazards. (PR #98956)
David Green via llvm-commits
llvm-commits at lists.llvm.org
Tue Jul 16 02:21:41 PDT 2024
================
@@ -3798,6 +3952,10 @@ bool AArch64FrameLowering::enableStackSlotScavenging(
// function doesn't use a FP.
if (AFI->hasStreamingModeChanges() && !hasFP(MF))
return false;
+ // Don't allow register salvaging with hazard slots, in case it moves objects
+ // into the wrong place.
+ if (AFI->hasStackHazardSlotIndex())
+ return false;
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davemgreen wrote:
Yep - in some cases it was moving the FPR registers into the empty slot next to fp or the scavenged register.
https://github.com/llvm/llvm-project/pull/98956
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