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Fix a serious brain-o. Obviously no-one reviewed my patch :(

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This fixes PR2359


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51536 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-05-24 04:06:28 +00:00
parent 60301608f8
commit 393f7eb60a
2 changed files with 15 additions and 2 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -5571,7 +5571,8 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
SMax.convertFromAPInt(APInt::getSignedMaxValue(IntWidth), true, SMax.convertFromAPInt(APInt::getSignedMaxValue(IntWidth), true,
APFloat::rmNearestTiesToEven); APFloat::rmNearestTiesToEven);
if (SMax.compare(RHS) == APFloat::cmpLessThan) { // smax < 13123.0 if (SMax.compare(RHS) == APFloat::cmpLessThan) { // smax < 13123.0
if (ICmpInst::ICMP_NE || ICmpInst::ICMP_SLT || Pred == ICmpInst::ICMP_SLE) if (Pred == ICmpInst::ICMP_NE || Pred == ICmpInst::ICMP_SLT ||
Pred == ICmpInst::ICMP_SLE)
return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 1)); return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 1));
return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 0)); return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 0));
} }
@ -5581,7 +5582,8 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
SMin.convertFromAPInt(APInt::getSignedMinValue(IntWidth), true, SMin.convertFromAPInt(APInt::getSignedMinValue(IntWidth), true,
APFloat::rmNearestTiesToEven); APFloat::rmNearestTiesToEven);
if (SMin.compare(RHS) == APFloat::cmpGreaterThan) { // smin > 12312.0 if (SMin.compare(RHS) == APFloat::cmpGreaterThan) { // smin > 12312.0
if (ICmpInst::ICMP_NE || ICmpInst::ICMP_SGT || Pred == ICmpInst::ICMP_SGE) if (Pred == ICmpInst::ICMP_NE || Pred == ICmpInst::ICMP_SGT ||
Pred == ICmpInst::ICMP_SGE)
return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 1)); return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 1));
return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 0)); return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, 0));
} }

11
test/Transforms/InstCombine/2008-05-23-CompareFold.ll Normal file
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@ -0,0 +1,11 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i1 false}
; PR2359
define i1 @f(i8* %x) {
entry:
%tmp462 = load i8* %x, align 1 ; <i8> [#uses=1]
%tmp462463 = sitofp i8 %tmp462 to float ; <float> [#uses=1]
%tmp464 = fcmp ugt float %tmp462463, 0x47EFFFFFE0000000 ; <i1>
ret i1 %tmp464
}