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remove the instcombine transformations that are inserting nasty

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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
This commit is contained in:
Chris Lattner 2010-01-02 00:31:05 +00:00
parent 09987f73f6
commit 0b178e25c4
2 changed files with 0 additions and 45 deletions
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30
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -4166,21 +4166,6 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
/// FoldAndOfICmps - Fold (icmp)&(icmp) if possible.
Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
ICmpInst *LHS, ICmpInst *RHS) {
// (icmp eq A, null) & (icmp eq B, null) -->
// (icmp eq (ptrtoint(A)|ptrtoint(B)), 0)
if (TD &&
LHS->getPredicate() == ICmpInst::ICMP_EQ &&
RHS->getPredicate() == ICmpInst::ICMP_EQ &&
isa<ConstantPointerNull>(LHS->getOperand(1)) &&
isa<ConstantPointerNull>(RHS->getOperand(1))) {
const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
Value *NewOr = Builder->CreateOr(A, B);
return new ICmpInst(ICmpInst::ICMP_EQ, NewOr,
Constant::getNullValue(IntPtrTy));
}
Value *Val, *Val2;
ConstantInt *LHSCst, *RHSCst;
ICmpInst::Predicate LHSCC, RHSCC;
@ -4861,21 +4846,6 @@ static Instruction *MatchSelectFromAndOr(Value *A, Value *B,
/// FoldOrOfICmps - Fold (icmp)|(icmp) if possible.
Instruction *InstCombiner::FoldOrOfICmps(Instruction &I,
ICmpInst *LHS, ICmpInst *RHS) {
// (icmp ne A, null) | (icmp ne B, null) -->
// (icmp ne (ptrtoint(A)|ptrtoint(B)), 0)
if (TD &&
LHS->getPredicate() == ICmpInst::ICMP_NE &&
RHS->getPredicate() == ICmpInst::ICMP_NE &&
isa<ConstantPointerNull>(LHS->getOperand(1)) &&
isa<ConstantPointerNull>(RHS->getOperand(1))) {
const Type *IntPtrTy = TD->getIntPtrType(I.getContext());
Value *A = Builder->CreatePtrToInt(LHS->getOperand(0), IntPtrTy);
Value *B = Builder->CreatePtrToInt(RHS->getOperand(0), IntPtrTy);
Value *NewOr = Builder->CreateOr(A, B);
return new ICmpInst(ICmpInst::ICMP_NE, NewOr,
Constant::getNullValue(IntPtrTy));
}
Value *Val, *Val2;
ConstantInt *LHSCst, *RHSCst;
ICmpInst::Predicate LHSCC, RHSCC;

15
test/Transforms/InstCombine/or.ll
View File

@ -268,21 +268,6 @@ define i1 @test26(i32 %A, i32 %B) {
; CHECK: ret i1
}
; PR5634
define i1 @test27(i32* %A, i32* %B) {
%C1 = icmp eq i32* %A, null
%C2 = icmp eq i32* %B, null
; (A == 0) & (A == 0) --> (A|B) == 0
%D = and i1 %C1, %C2
ret i1 %D
; CHECK: @test27
; CHECK: ptrtoint i32* %A
; CHECK: ptrtoint i32* %B
; CHECK: or i32
; CHECK: icmp eq i32 {{.*}}, 0
; CHECK: ret i1
}
; PR5634
define i1 @test28(i32 %A, i32 %B) {
%C1 = icmp ne i32 %A, 0