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Folding or(fcmp,fcmp) only works if the operands of the fcmps are the same fp type.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47750 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-02-29 06:09:11 +00:00
parent bec2c0c7e1
commit 5ebd93630b
2 changed files with 18 additions and 1 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4287,7 +4287,8 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
if (FCmpInst *LHS = dyn_cast<FCmpInst>(I.getOperand(0))) {
if (FCmpInst *RHS = dyn_cast<FCmpInst>(I.getOperand(1))) {
if (LHS->getPredicate() == FCmpInst::FCMP_UNO &&
RHS->getPredicate() == FCmpInst::FCMP_UNO)
RHS->getPredicate() == FCmpInst::FCMP_UNO &&
LHS->getOperand(0)->getType() == RHS->getOperand(0)->getType())
if (ConstantFP *LHSC = dyn_cast<ConstantFP>(LHS->getOperand(1)))
if (ConstantFP *RHSC = dyn_cast<ConstantFP>(RHS->getOperand(1))) {
// If either of the constants are nans, then the whole thing returns

16
test/Transforms/InstCombine/2008-02-28-OrFCmpCrash.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis
; rdar://5771353
define float @test(float %x, x86_fp80 %y) nounwind readonly {
entry:
%tmp67 = fcmp uno x86_fp80 %y, 0xK00000000000000000000 ; <i1> [#uses=1]
%tmp71 = fcmp uno float %x, 0.000000e+00 ; <i1> [#uses=1]
%bothcond = or i1 %tmp67, %tmp71 ; <i1> [#uses=1]
br i1 %bothcond, label %bb74, label %bb80
bb74: ; preds = %entry
ret float 0.000000e+00
bb80: ; preds = %entry
ret float 0.000000e+00
}