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Make the ptrtoint comparison simplification work if one side is a global.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-12-17 21:27:47 +00:00
parent 73ebbd8aac
commit 8e4b197e0b
2 changed files with 10 additions and 1 deletions
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2
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6452,7 +6452,7 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
// if (X) ...
// For generality, we handle any zero-extension of any operand comparison
// with a constant or another cast from the same type.
if (isa<ConstantInt>(Op1) || isa<CastInst>(Op1))
if (isa<Constant>(Op1) || isa<CastInst>(Op1))
if (Instruction *R = visitICmpInstWithCastAndCast(I))
return R;
}

9
test/Transforms/InstCombine/cast_ptr.ll
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@ -27,3 +27,12 @@ define i1 @test2(i8* %a, i8* %b) {
ret i1 %r
}
; These casts should also be folded away.
; CHECK: @test3
; CHECK: icmp eq i8* %a, @global
@global = global i8 0
define i1 @test3(i8* %a) {
%tmpa = ptrtoint i8* %a to i32
%r = icmp eq i32 %tmpa, ptrtoint (i8* @global to i32)
ret i1 %r
}