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InstCombine: Don't assume DataLayout is always available
We tried to get the result of DataLayout::getLargestLegalIntTypeSize but we didn't have a DataLayout. This resulted in opt crashing. This fixes PR21651. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222645 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2095,7 +2095,8 @@ Instruction *InstCombiner::visitSwitchInst(SwitchInst &SI) {
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// the largest legal integer type. We need to be conservative here since
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// x86 generates redundant zero-extenstion instructions if the operand is
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// truncated to i8 or i16.
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if (BitWidth > NewWidth && NewWidth >= DL->getLargestLegalIntTypeSize()) {
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if (DL && BitWidth > NewWidth &&
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NewWidth >= DL->getLargestLegalIntTypeSize()) {
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IntegerType *Ty = IntegerType::get(SI.getContext(), NewWidth);
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Builder->SetInsertPoint(&SI);
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Value *NewCond = Builder->CreateTrunc(SI.getCondition(), Ty, "trunc");
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20
test/Transforms/InstCombine/pr21651.ll
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20
test/Transforms/InstCombine/pr21651.ll
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@ -0,0 +1,20 @@
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define void @PR21651() {
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switch i2 0, label %out [
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i2 0, label %out
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i2 1, label %out
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]
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out:
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ret void
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}
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; CHECK-LABEL: define void @PR21651(
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; CHECK: switch i2 0, label %out [
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; CHECK: i2 0, label %out
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; CHECK: i2 1, label %out
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; CHECK: ]
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; CHECK: out: ; preds = %0, %0, %0
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; CHECK: ret void
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; CHECK: }
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