https://bugs.llvm.org/show_bug.cgi?id=45572
Bug ID: 45572
Summary: Interleave failure in Loop Vectorizer
Product: libraries
Version: 10.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 23370
--> https://bugs.llvm.org/attachment.cgi?id=23370&action=edit
IR to reproduce the error
Hello,
I'm observing a problem with load instruction being vectorized(by Loop
Vectorizer) but erroring out because of the below mentioned error:
Error message :: void
llvm::InnerLoopVectorizer::vectorizeMemoryInstruction(llvm::Instruction*,
llvm::VPTransformState&, llvm::VPValue*, llvm::VPValue*, llvm::VPValue*):
Assertion `(Decision == LoopVectorizationCostModel::CM_Widen || Decision ==
LoopVectorizationCostModel::CM_Widen_Reverse || Decision ==
LoopVectorizationCostModel::CM_GatherScatter) && "CM decision is not to widen
the memory instruction"' failed.
Source code ::
https://github.com/llvm/llvm-project/blob/master/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp#L2373
The problem is observed because Decision variable is set to CM_Interleave.
While debugging, I found out that the decision is being set to CM_Interleave in
the following
line(https://github.com/llvm/llvm-project/blob/master/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp#L6088
). But, CM_Interleave decision type is not supported in
InnerLoopVectorizer::vectorizeMemoryInstruction function.
The attached file(vect.ll) is able to reproduce the error from LLVM master
branch.
Command to reproduce the error:
./opt -loop-vectorize -hexagon-autohvx=1 vect.ll -S
Thanks,
Abhikrant
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