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remove the instcombine transformations that are inserting nasty
pointer to int casts that confuse later optimizations. See PR3351 for details. This improves but doesn't complete fix 483.xalancbmk because llvm-gcc does this xform in GCC's "fold" routine as well. Clang++ will do better I guess. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92408 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4166,21 +4166,6 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
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/// FoldAndOfICmps - Fold (icmp)&(icmp) if possible.
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Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
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ICmpInst *LHS, ICmpInst *RHS) {
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// (icmp eq A, null) & (icmp eq B, null) -->
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// (icmp eq (ptrtoint(A)|ptrtoint(B)), 0)
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if (TD &&
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LHS->getPredicate() == ICmpInst::ICMP_EQ &&
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RHS->getPredicate() == ICmpInst::ICMP_EQ &&
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isa<ConstantPointerNull>(LHS->getOperand(1)) &&
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isa<ConstantPointerNull>(RHS->getOperand(1))) {
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const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
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Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
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Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
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Value *NewOr = Builder->CreateOr(A, B);
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return new ICmpInst(ICmpInst::ICMP_EQ, NewOr,
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Constant::getNullValue(IntPtrTy));
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}
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Value *Val, *Val2;
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ConstantInt *LHSCst, *RHSCst;
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ICmpInst::Predicate LHSCC, RHSCC;
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@ -4861,21 +4846,6 @@ static Instruction *MatchSelectFromAndOr(Value *A, Value *B,
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/// FoldOrOfICmps - Fold (icmp)|(icmp) if possible.
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Instruction *InstCombiner::FoldOrOfICmps(Instruction &I,
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ICmpInst *LHS, ICmpInst *RHS) {
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// (icmp ne A, null) | (icmp ne B, null) -->
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// (icmp ne (ptrtoint(A)|ptrtoint(B)), 0)
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if (TD &&
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LHS->getPredicate() == ICmpInst::ICMP_NE &&
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RHS->getPredicate() == ICmpInst::ICMP_NE &&
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isa<ConstantPointerNull>(LHS->getOperand(1)) &&
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isa<ConstantPointerNull>(RHS->getOperand(1))) {
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const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
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Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
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Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
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Value *NewOr = Builder->CreateOr(A, B);
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return new ICmpInst(ICmpInst::ICMP_NE, NewOr,
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Constant::getNullValue(IntPtrTy));
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}
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Value *Val, *Val2;
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ConstantInt *LHSCst, *RHSCst;
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ICmpInst::Predicate LHSCC, RHSCC;
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@ -268,21 +268,6 @@ define i1 @test26(i32 %A, i32 %B) {
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; CHECK: ret i1
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}
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; PR5634
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define i1 @test27(i32* %A, i32* %B) {
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%C1 = icmp eq i32* %A, null
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%C2 = icmp eq i32* %B, null
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; (A == 0) & (A == 0) --> (A|B) == 0
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%D = and i1 %C1, %C2
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ret i1 %D
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; CHECK: @test27
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; CHECK: ptrtoint i32* %A
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; CHECK: ptrtoint i32* %B
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; CHECK: or i32
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; CHECK: icmp eq i32 {{.*}}, 0
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; CHECK: ret i1
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}
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; PR5634
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define i1 @test28(i32 %A, i32 %B) {
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%C1 = icmp ne i32 %A, 0
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