http://llvm.org/bugs/show_bug.cgi?id=11769
Bug #: 11769
Summary: AVX codegen crash
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 7884
--> http://llvm.org/bugs/attachment.cgi?id=7884
Reproducer
The attached test crashes when compiled with -matter=+avx. The problem is that
LowerVECTOR_SHUFFLE decides to give up on the lowering on a certain
vectorshuffle instruction because it believes that the DAGCombiner would catch
this pattern. I think that the pattern is (extract(shufflevector(load))). When
the dagcombiner fails to remove this pattern, we fail with 'unable to select
pattern'.
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