http://llvm.org/bugs/show_bug.cgi?id=21876
Bug ID: 21876
Summary: [AVX2] Cannot select: v8i32 = X86ISD::VZEXT with old
vector shuffle lowering
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13515
--> http://llvm.org/bugs/attachment.cgi?id=13515&action=edit
IR to reproduce the problem.
While trying to compare the performance of the old vector shuffle lowering
against the new one, I ran into this cannot select error.
This used to work until fairly recently, I think, r223304, but it is now broken
with r223979.
To reproduce:
llc -mtriple=x86_64-apple-macosx
-x86-experimental-vector-shuffle-lowering=false -mattr=+avx2 tmp3.ll
Removing avx2 or using the new vector shuffle lowering works.
Until the old vector shuffle lowering is official dead, we should fix that to
ease comparison.
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