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Make gep i8* X, -(ptrtoint Y) transform work with address spaces

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2013-10-03 18:15:57 +00:00
parent d6370ad87d
commit 1df59ef1aa
2 changed files with 23 additions and 8 deletions
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18
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -1186,14 +1186,16 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// The GEP pattern is emitted by the SCEV expander for certain kinds of
// pointer arithmetic.
if (TD && GEP.getNumIndices() == 1 &&
match(GEP.getOperand(1), m_Neg(m_PtrToInt(m_Value()))) &&
GEP.getType() == Builder->getInt8PtrTy() &&
GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
TD->getPointerSizeInBits(GEP.getPointerAddressSpace())) {
Operator *Index = cast<Operator>(GEP.getOperand(1));
Value *PtrToInt = Builder->CreatePtrToInt(PtrOp, Index->getType());
Value *NewSub = Builder->CreateSub(PtrToInt, Index->getOperand(1));
return CastInst::Create(Instruction::IntToPtr, NewSub, GEP.getType());
match(GEP.getOperand(1), m_Neg(m_PtrToInt(m_Value())))) {
unsigned AS = GEP.getPointerAddressSpace();
if (GEP.getType() == Builder->getInt8PtrTy(AS) &&
GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
TD->getPointerSizeInBits(AS)) {
Operator *Index = cast<Operator>(GEP.getOperand(1));
Value *PtrToInt = Builder->CreatePtrToInt(PtrOp, Index->getType());
Value *NewSub = Builder->CreateSub(PtrToInt, Index->getOperand(1));
return CastInst::Create(Instruction::IntToPtr, NewSub, GEP.getType());
}
}
// Handle gep(bitcast x) and gep(gep x, 0, 0, 0).

13
test/Transforms/InstCombine/getelementptr.ll
View File

@ -776,4 +776,17 @@ define i64 @test40() {
; CHECK-NEXT: ret i64 8
}
define i16 @test41([3 x i32] addrspace(1)* %array) {
%gep = getelementptr inbounds [3 x i32] addrspace(1)* %array, i16 0, i16 2
%gepi8 = bitcast i32 addrspace(1)* %gep to i8 addrspace(1)*
%p = ptrtoint [3 x i32] addrspace(1)* %array to i16
%np = sub i16 0, %p
%gep2 = getelementptr i8 addrspace(1)* %gepi8, i16 %np
%ret = ptrtoint i8 addrspace(1)* %gep2 to i16
ret i16 %ret
; CHECK-LABEL: @test41(
; CHECK-NEXT: ret i16 8
}
; CHECK: attributes [[NUW]] = { nounwind }