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When the two operands of an icmp are equal, there are five possible predicates
that would make the icmp true. Fixes PR1637. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41740 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4563,7 +4563,9 @@ Instruction *InstCombiner::FoldGEPICmp(User *GEPLHS, Value *RHS,
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if (NumDifferences == 0) // SAME GEP?
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return ReplaceInstUsesWith(I, // No comparison is needed here.
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ConstantInt::get(Type::Int1Ty,
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Cond == ICmpInst::ICMP_EQ));
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Cond == ICmpInst::ICMP_EQ ||
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Cond == ICmpInst::ICMP_ULE || Cond == ICmpInst::ICMP_UGE ||
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Cond == ICmpInst::ICMP_SLE || Cond == ICmpInst::ICMP_SGE));
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else if (NumDifferences == 1) {
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Value *LHSV = GEPLHS->getOperand(DiffOperand);
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Value *RHSV = GEPRHS->getOperand(DiffOperand);
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10
test/Transforms/InstCombine/2007-09-05-EqualGEP.ll
Normal file
10
test/Transforms/InstCombine/2007-09-05-EqualGEP.ll
Normal file
@ -0,0 +1,10 @@
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i1 true}
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; PR1637
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define i1 @f(i8* %arr) {
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%X = getelementptr i8* %arr, i32 1
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%Y = getelementptr i8* %arr, i32 1
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%test = icmp uge i8* %X, %Y
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ret i1 %test
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}
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