http://llvm.org/bugs/show_bug.cgi?id=16886
Bug ID: 16886
Summary: Frame pointer elimination causes misaligned stack
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11035
--> http://llvm.org/bugs/attachment.cgi?id=11035&action=edit
Repro IR printout
My JIT-compiled function looks like this when using LLVM 3.3:
push ebp
push ebx
push edi
push esi
sub esp,0ACh
...
movaps xmmword ptr [esp+80h],xmm1
...
It's a leaf function, so frame pointer elimination took place, but in the fifth
instruction of the prologue esp isn't adjusted to a 16-byte aligned value. Thus
the first SSE spill instruction causes an unaligned access violation.
This happens even when I set TargetOptions::StackAlignmentOverride to 16. I
have to set NoFramePointerElim to true to get working code.
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