https://bugs.llvm.org/show_bug.cgi?id=32453
Bug ID: 32453
Summary: single-operand vector shuffle fails assertion in
lowerVectorShuffleAsSplitOrBlend
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: andrew.b.ad...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 18194
--> https://bugs.llvm.org/attachment.cgi?id=18194&action=edit
ll that reproduces
The attached .ll used to compile correctly like so:
llc bad.ll -mattr=+avx2
Sometime between 298846 and 298880 it started failing an assertion:
llc:
/usr/local/google/home/abadams/projects/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp:11901:
llvm::SDValue lowerVectorShuffleAsSplitOrBlend(const llvm::SDLoc&, llvm::MVT,
llvm::SDValue, llvm::SDValue, llvm::ArrayRef<int>, llvm::SelectionDAG&):
Assertion `!V2.isUndef() && "This routine must not be used to lower
single-input " "shuffles as it could then recurse on itself."' failed.
Sorry that the attached .ll is large. bugpoint reduces the crash to something
that looks unrelated to me.
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