http://llvm.org/bugs/show_bug.cgi?id=13503
Bug #: 13503
Summary: x86 AVX instruction was generated but stack object
pointer is not 16/32 byte aligned.
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 8978
--> http://llvm.org/bugs/attachment.cgi?id=8978
IR file
Hi all,
Thanks for your attention.
Attachments is a bit long to describe this,
in short,
1. In LLVM IR, I used float vector as value form but not stack object.
2. Native instruction
009801D1 vmovdqa xmm3,xmmword ptr [esp+40h] was generated.
3. But the prologue of this frame is:
00980020 push ebp
00980021 mov ebp,esp
00980023 push ebx
00980024 push edi
00980025 push esi
00980026 and esp,0FFFFFFF8h
0098002C sub esp,68h
It just 8-aligned. I don't know why analysis code did not calculate right align
data, but correct stack frame offset.
Thank you.
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