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Fix a rather nasty regression from r150690: LHS != RHS does not imply LHS->stripPointerCasts() != RHS->stripPointerCasts().

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2012-02-18 03:29:25 +00:00
parent 5bfd969208
commit 2c3acb0e27
2 changed files with 12 additions and 1 deletions
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3
lib/Analysis/InstructionSimplify.cpp
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@ -1593,10 +1593,11 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
// the compare, and if only one of them is then we moved it to RHS already.
Value *LHSPtr = LHS->stripPointerCasts();
Value *RHSPtr = RHS->stripPointerCasts();
if (LHSPtr == RHSPtr)
return ConstantInt::get(ITy, CmpInst::isTrueWhenEqual(Pred));
if (isa<AllocaInst>(LHSPtr) && (isa<GlobalValue>(RHSPtr) ||
isa<AllocaInst>(RHSPtr) ||
isa<ConstantPointerNull>(RHSPtr)))
// We already know that LHS != RHS.
return ConstantInt::get(ITy, CmpInst::isFalseWhenEqual(Pred));
// If we are comparing with zero then try hard since this is a common case.

10
test/Transforms/InstSimplify/compare.ll
View File

@ -30,6 +30,16 @@ define i1 @gep() {
; CHECK-NEXT: ret i1 false
}
define i1 @gep2() {
; CHECK: @gep2
%a = alloca [3 x i8], align 8
%x = getelementptr inbounds [3 x i8]* %a, i32 0, i32 0
%y = getelementptr inbounds [3 x i8]* %a, i32 0, i32 0
%cmp = icmp eq i8* %x, %y
ret i1 %cmp
; CHECK-NEXT: ret i1 true
}
define i1 @zext(i32 %x) {
; CHECK: @zext
%e1 = zext i32 %x to i64