http://llvm.org/bugs/show_bug.cgi?id=11370
Bug #: 11370
Summary: AVX2 vpxor instruction generated with AVX1 target
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 7608
--> http://llvm.org/bugs/attachment.cgi?id=7608
test case
With the attached test case, an AVX2 vpxor instruction is generated even if
just the AVX1 target is specified:
% llc -mattr=+avx x.ll -o - | grep xor
vxorps %xmm2, %xmm2, %xmm2
vpxor %ymm3, %ymm2, %ymm2
%
This causes the illegal instruction trap that one would expect on an AVX1
system.
Some archaeology indicates that this bug was introduced in this commit:
commit b80ada98c50df226e210eabc9547101c5dee2181
Author: Craig Topper <[email protected]>
Date: Wed Nov 9 09:37:21 2011 +0000
Enable execution dependency fix pass for YMM registers when AVX2 is
enabled. Add AVX2 logical operations to list of replaceable instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144179
91177308-0d34-0410-b5e6-96231b3b80d8
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