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Make gep i8* X, -(ptrtoint Y) transform work with address spaces
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191920 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1186,14 +1186,16 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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// The GEP pattern is emitted by the SCEV expander for certain kinds of
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// pointer arithmetic.
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if (TD && GEP.getNumIndices() == 1 &&
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match(GEP.getOperand(1), m_Neg(m_PtrToInt(m_Value()))) &&
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GEP.getType() == Builder->getInt8PtrTy() &&
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GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
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TD->getPointerSizeInBits(GEP.getPointerAddressSpace())) {
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Operator *Index = cast<Operator>(GEP.getOperand(1));
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Value *PtrToInt = Builder->CreatePtrToInt(PtrOp, Index->getType());
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Value *NewSub = Builder->CreateSub(PtrToInt, Index->getOperand(1));
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return CastInst::Create(Instruction::IntToPtr, NewSub, GEP.getType());
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match(GEP.getOperand(1), m_Neg(m_PtrToInt(m_Value())))) {
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unsigned AS = GEP.getPointerAddressSpace();
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if (GEP.getType() == Builder->getInt8PtrTy(AS) &&
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GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
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TD->getPointerSizeInBits(AS)) {
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Operator *Index = cast<Operator>(GEP.getOperand(1));
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Value *PtrToInt = Builder->CreatePtrToInt(PtrOp, Index->getType());
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Value *NewSub = Builder->CreateSub(PtrToInt, Index->getOperand(1));
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return CastInst::Create(Instruction::IntToPtr, NewSub, GEP.getType());
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}
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}
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// Handle gep(bitcast x) and gep(gep x, 0, 0, 0).
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@ -776,4 +776,17 @@ define i64 @test40() {
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; CHECK-NEXT: ret i64 8
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}
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define i16 @test41([3 x i32] addrspace(1)* %array) {
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%gep = getelementptr inbounds [3 x i32] addrspace(1)* %array, i16 0, i16 2
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%gepi8 = bitcast i32 addrspace(1)* %gep to i8 addrspace(1)*
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%p = ptrtoint [3 x i32] addrspace(1)* %array to i16
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%np = sub i16 0, %p
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%gep2 = getelementptr i8 addrspace(1)* %gepi8, i16 %np
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%ret = ptrtoint i8 addrspace(1)* %gep2 to i16
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ret i16 %ret
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; CHECK-LABEL: @test41(
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; CHECK-NEXT: ret i16 8
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}
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; CHECK: attributes [[NUW]] = { nounwind }
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