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[InstCombine][SVE] Fix visitGetElementPtrInst for scalable type.
Summary:
This patch fix the following issues in InstCombiner::visitGetElementPtrInst
1. Skip for scalable type if transformation requires fixed size number of
vector element.
2. Skip for scalable type if transformation relies on compile-time known type
alloc size.
3. Use VectorType::getElementCount when scalable property is used to construct
new VectorType.
4. Use TypeSize::getKnownMinSize when minimal size of a scalable type is valid to determine GEP 'inbounds'.
5. Explicitly call TypeSize::getFixedSize to avoid implicit type conversion to uint64_t.
Reviewers: sdesmalen, efriedma, spatel, ctetreau
Reviewed By: efriedma
Subscribers: tschuett, hiraditya, rkruppe, psnobl, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78081
This commit is contained in:
Huihui Zhang
parent
7beb37bd0a
commit
e95004d091
@ -1854,12 +1854,16 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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SmallVector<Value*, 8> Ops(GEP.op_begin(), GEP.op_end());
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Type *GEPType = GEP.getType();
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Type *GEPEltType = GEP.getSourceElementType();
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bool IsGEPSrcEleScalable =
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GEPEltType->isVectorTy() && cast<VectorType>(GEPEltType)->isScalable();
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if (Value *V = SimplifyGEPInst(GEPEltType, Ops, SQ.getWithInstruction(&GEP)))
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return replaceInstUsesWith(GEP, V);
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// For vector geps, use the generic demanded vector support.
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if (auto *GEPVTy = dyn_cast<VectorType>(GEP.getType())) {
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auto VWidth = GEPVTy->getNumElements();
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// Skip if GEP return type is scalable. The number of elements is unknown at
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// compile-time.
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if (GEPType->isVectorTy() && !cast<VectorType>(GEPType)->isScalable()) {
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auto VWidth = cast<VectorType>(GEPType)->getNumElements();
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APInt UndefElts(VWidth, 0);
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APInt AllOnesEltMask(APInt::getAllOnesValue(VWidth));
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if (Value *V = SimplifyDemandedVectorElts(&GEP, AllOnesEltMask,
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@ -1896,7 +1900,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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Type *NewIndexType =
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IndexTy->isVectorTy()
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? VectorType::get(NewScalarIndexTy,
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cast<VectorType>(IndexTy)->getNumElements())
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cast<VectorType>(IndexTy)->getElementCount())
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: NewScalarIndexTy;
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// If the element type has zero size then any index over it is equivalent
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@ -2146,11 +2150,13 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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GEP.getName());
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}
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if (GEP.getNumIndices() == 1) {
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// Skip if GEP source element type is scalable. The type alloc size is unknown
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// at compile-time.
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if (GEP.getNumIndices() == 1 && !IsGEPSrcEleScalable) {
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unsigned AS = GEP.getPointerAddressSpace();
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if (GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
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DL.getIndexSizeInBits(AS)) {
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uint64_t TyAllocSize = DL.getTypeAllocSize(GEPEltType);
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uint64_t TyAllocSize = DL.getTypeAllocSize(GEPEltType).getFixedSize();
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bool Matched = false;
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uint64_t C;
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@ -2263,10 +2269,12 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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}
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}
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}
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} else if (GEP.getNumOperands() == 2) {
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// Transform things like:
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// %t = getelementptr i32* bitcast ([2 x i32]* %str to i32*), i32 %V
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// into: %t1 = getelementptr [2 x i32]* %str, i32 0, i32 %V; bitcast
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} else if (GEP.getNumOperands() == 2 && !IsGEPSrcEleScalable) {
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// Skip if GEP source element type is scalable. The type alloc size is
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// unknown at compile-time.
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// Transform things like: %t = getelementptr i32*
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// bitcast ([2 x i32]* %str to i32*), i32 %V into: %t1 = getelementptr [2
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// x i32]* %str, i32 0, i32 %V; bitcast
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if (StrippedPtrEltTy->isArrayTy() &&
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DL.getTypeAllocSize(StrippedPtrEltTy->getArrayElementType()) ==
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DL.getTypeAllocSize(GEPEltType)) {
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@ -2290,8 +2298,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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if (GEPEltType->isSized() && StrippedPtrEltTy->isSized()) {
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// Check that changing the type amounts to dividing the index by a scale
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// factor.
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uint64_t ResSize = DL.getTypeAllocSize(GEPEltType);
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uint64_t SrcSize = DL.getTypeAllocSize(StrippedPtrEltTy);
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uint64_t ResSize = DL.getTypeAllocSize(GEPEltType).getFixedSize();
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uint64_t SrcSize = DL.getTypeAllocSize(StrippedPtrEltTy).getFixedSize();
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if (ResSize && SrcSize % ResSize == 0) {
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Value *Idx = GEP.getOperand(1);
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unsigned BitWidth = Idx->getType()->getPrimitiveSizeInBits();
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@ -2330,9 +2338,10 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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StrippedPtrEltTy->isArrayTy()) {
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// Check that changing to the array element type amounts to dividing the
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// index by a scale factor.
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uint64_t ResSize = DL.getTypeAllocSize(GEPEltType);
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uint64_t ResSize = DL.getTypeAllocSize(GEPEltType).getFixedSize();
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uint64_t ArrayEltSize =
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DL.getTypeAllocSize(StrippedPtrEltTy->getArrayElementType());
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DL.getTypeAllocSize(StrippedPtrEltTy->getArrayElementType())
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.getFixedSize();
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if (ResSize && ArrayEltSize % ResSize == 0) {
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Value *Idx = GEP.getOperand(1);
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unsigned BitWidth = Idx->getType()->getPrimitiveSizeInBits();
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@ -2480,7 +2489,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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if (auto *AI = dyn_cast<AllocaInst>(UnderlyingPtrOp)) {
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if (GEP.accumulateConstantOffset(DL, BasePtrOffset) &&
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BasePtrOffset.isNonNegative()) {
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APInt AllocSize(IdxWidth, DL.getTypeAllocSize(AI->getAllocatedType()));
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APInt AllocSize(
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IdxWidth,
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DL.getTypeAllocSize(AI->getAllocatedType()).getKnownMinSize());
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if (BasePtrOffset.ule(AllocSize)) {
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return GetElementPtrInst::CreateInBounds(
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GEP.getSourceElementType(), PtrOp, makeArrayRef(Ops).slice(1),
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68
test/Transforms/InstCombine/vscale_gep.ll
Normal file
68
test/Transforms/InstCombine/vscale_gep.ll
Normal file
@ -0,0 +1,68 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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; This test is used to verify we are not crashing at Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!".
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define <vscale x 2 x i8*> @gep_index_type_is_scalable(i8* %p) {
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; CHECK-LABEL: @gep_index_type_is_scalable(
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, i8* [[P:%.*]], <vscale x 2 x i64> undef
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; CHECK-NEXT: ret <vscale x 2 x i8*> [[GEP]]
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;
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%gep = getelementptr i8, i8* %p, <vscale x 2 x i64> undef
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ret <vscale x 2 x i8*> %gep
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}
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; This test serves to verify code changes for "GEP.getNumIndices() == 1".
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define <vscale x 4 x i32>* @gep_num_of_indices_1(<vscale x 4 x i32>* %p) {
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; CHECK-LABEL: @gep_num_of_indices_1(
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* [[P:%.*]], i64 1
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; CHECK-NEXT: ret <vscale x 4 x i32>* [[GEP]]
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;
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%gep = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* %p, i64 1
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ret <vscale x 4 x i32>* %gep
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}
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; This test serves to verify code changes for "GEP.getNumOperands() == 2".
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define void @gep_bitcast(i8* %p) {
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; CHECK-LABEL: @gep_bitcast(
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; CHECK-NEXT: [[CAST:%.*]] = bitcast i8* [[P:%.*]] to <vscale x 16 x i8>*
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; CHECK-NEXT: store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* [[CAST]], align 16
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; CHECK-NEXT: [[GEP2:%.*]] = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* [[CAST]], i64 1
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; CHECK-NEXT: store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* [[GEP2]], align 16
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; CHECK-NEXT: ret void
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;
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%cast = bitcast i8* %p to <vscale x 16 x i8>*
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%gep1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %cast, i64 0
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store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %gep1
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%gep2 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %cast, i64 1
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store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %gep2
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ret void
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}
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; These tests serve to verify code changes when underlying gep ptr is alloca.
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; This test is to verify 'inbounds' is added when it's valid to accumulate constant offset.
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define i32 @gep_alloca_inbounds_vscale_zero() {
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; CHECK-LABEL: @gep_alloca_inbounds_vscale_zero(
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; CHECK-NEXT: [[A:%.*]] = alloca <vscale x 4 x i32>, align 16
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; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds <vscale x 4 x i32>, <vscale x 4 x i32>* [[A]], i64 0, i64 2
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, i32* [[TMP]], align 8
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; CHECK-NEXT: ret i32 [[LOAD]]
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;
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%a = alloca <vscale x 4 x i32>
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%tmp = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* %a, i32 0, i32 2
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%load = load i32, i32* %tmp
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ret i32 %load
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}
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; This test is to verify 'inbounds' is not added when a constant offset can not be determined at compile-time.
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define i32 @gep_alloca_inbounds_vscale_nonzero() {
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; CHECK-LABEL: @gep_alloca_inbounds_vscale_nonzero(
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; CHECK-NEXT: [[A:%.*]] = alloca <vscale x 4 x i32>, align 16
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; CHECK-NEXT: [[TMP:%.*]] = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* [[A]], i64 1, i64 2
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, i32* [[TMP]], align 8
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; CHECK-NEXT: ret i32 [[LOAD]]
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;
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%a = alloca <vscale x 4 x i32>
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%tmp = getelementptr <vscale x 4 x i32>, <vscale x 4 x i32>* %a, i32 1, i32 2
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%load = load i32, i32* %tmp
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ret i32 %load
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}
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