https://bugs.llvm.org/show_bug.cgi?id=48321
Bug ID: 48321
Summary: [LoopVectorizer] getInstructionCost() triggers assert
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 24216
--> https://bugs.llvm.org/attachment.cgi?id=24216&action=edit
reduced testcase
LoopVectorizationCostModel::getInstructionCost is passed a trunc instruction:
%i11.i = trunc i40 %i10.i to i32
RetTy is first i32, but after
if (canTruncateToMinimalBitwidth(I, VF))
RetTy = IntegerType::get(RetTy->getContext(), MinBWs[I]);
it is set to i1, which seems broken?
SystemZTTIImpl::getCastInstrCost() is then called:
(gdb) p Dst->dump()
<2 x i32>
$49 = void
(gdb) p Src->dump()
<2 x i1>
which triggers an assert since this would be a cost of truncating i1 vector to
i32 vector, which doesn't make sense...
./bin/opt -mcpu=z14 tc_sztti.ll -o a.out -O2
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