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When comparing constants, consider a less wide constant to be "less complex"
than a wider one, before trying to compare their contents which will crash if their sizes are different. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74792 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -495,6 +495,8 @@ namespace {
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// Compare constant values.
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// Compare constant values.
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if (const SCEVConstant *LC = dyn_cast<SCEVConstant>(LHS)) {
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if (const SCEVConstant *LC = dyn_cast<SCEVConstant>(LHS)) {
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const SCEVConstant *RC = cast<SCEVConstant>(RHS);
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const SCEVConstant *RC = cast<SCEVConstant>(RHS);
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if (LC->getValue()->getBitWidth() != RC->getValue()->getBitWidth())
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return LC->getValue()->getBitWidth() < RC->getValue()->getBitWidth();
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return LC->getValue()->getValue().ult(RC->getValue()->getValue());
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return LC->getValue()->getValue().ult(RC->getValue()->getValue());
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}
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}
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@ -0,0 +1,16 @@
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; RUN: llvm-as < %s | opt -analyze -scalar-evolution
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; PR4501
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define void @test() {
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entry:
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%0 = load i16* undef, align 1
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%1 = lshr i16 %0, 8
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%2 = and i16 %1, 3
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%3 = zext i16 %2 to i32
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%4 = load i8* undef, align 1
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%5 = lshr i8 %4, 4
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%6 = and i8 %5, 1
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%7 = zext i8 %6 to i32
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%t1 = add i32 %3, %7
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ret void
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}
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