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Fix PR1800 by correcting mistaken logic.

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llvm-svn: 44188
This commit is contained in:
Chris Lattner 2007-11-16 06:04:17 +00:00
parent 8b9d6f487e
commit 5574ba5ce6
2 changed files with 11 additions and 2 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3577,8 +3577,7 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
case ICmpInst::ICMP_SGT:
switch (RHSCC) {
default: assert(0 && "Unknown integer condition code!");
case ICmpInst::ICMP_EQ: // (X s> 13 & X == 15) -> X s> 13
return ReplaceInstUsesWith(I, LHS);
case ICmpInst::ICMP_EQ: // (X s> 13 & X == 15) -> X == 15
case ICmpInst::ICMP_SGT: // (X s> 13 & X s> 15) -> X s> 15
return ReplaceInstUsesWith(I, RHS);
case ICmpInst::ICMP_UGT: // (X s> 13 & X u> 15) -> no change

10
test/Transforms/InstCombine/2007-11-15-CompareMiscomp.ll Normal file
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@ -0,0 +1,10 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {icmp eq i32 %In, 1}
; PR1800
define i1 @test(i32 %In) {
%c1 = icmp sgt i32 %In, -1
%c2 = icmp eq i32 %In, 1
%V = and i1 %c1, %c2
ret i1 %V
}