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Merged
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Jul 15, 2025
Merged

Emit array GEPs in memcpy/memset legalization #148886

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89a68b5
Emit array GEPs in memcpy/memset legalization
Icohedron Jul 15, 2025
cee5e6e
Merge remote-tracking branch 'upstream/main' into memcpy-memset-gep-fix
Icohedron Jul 15, 2025
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22 changes: 11 additions & 11 deletions llvm/lib/Target/DirectX/DXILLegalizePass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -347,7 +347,6 @@ static void emitMemcpyExpansion(IRBuilder<> &Builder, Value *Dst, Value *Src,
if (ByteLength == 0)
return;

LLVMContext &Ctx = Builder.getContext();
const DataLayout &DL = Builder.GetInsertBlock()->getModule()->getDataLayout();

auto GetArrTyFromVal = [](Value *Val) -> ArrayType * {
Expand Down Expand Up @@ -392,18 +391,18 @@ static void emitMemcpyExpansion(IRBuilder<> &Builder, Value *Dst, Value *Src,
assert(ByteLength % DstElemByteSize == 0 &&
"memcpy length must be divisible by array element type");
for (uint64_t I = 0; I < NumElemsToCopy; ++I) {
Value *Offset = ConstantInt::get(Type::getInt32Ty(Ctx), I);
Value *SrcPtr = Builder.CreateInBoundsGEP(SrcElemTy, Src, Offset, "gep");
SmallVector<Value *, 2> Indices = {Builder.getInt32(0),
Builder.getInt32(I)};
Value *SrcPtr = Builder.CreateInBoundsGEP(SrcArrTy, Src, Indices, "gep");
Value *SrcVal = Builder.CreateLoad(SrcElemTy, SrcPtr);
Value *DstPtr = Builder.CreateInBoundsGEP(DstElemTy, Dst, Offset, "gep");
Value *DstPtr = Builder.CreateInBoundsGEP(DstArrTy, Dst, Indices, "gep");
Builder.CreateStore(SrcVal, DstPtr);
}
}

static void emitMemsetExpansion(IRBuilder<> &Builder, Value *Dst, Value *Val,
ConstantInt *SizeCI,
DenseMap<Value *, Value *> &ReplacedValues) {
LLVMContext &Ctx = Builder.getContext();
[[maybe_unused]] const DataLayout &DL =
Builder.GetInsertBlock()->getModule()->getDataLayout();
[[maybe_unused]] uint64_t OrigSize = SizeCI->getZExtValue();
Expand Down Expand Up @@ -444,8 +443,9 @@ static void emitMemsetExpansion(IRBuilder<> &Builder, Value *Dst, Value *Val,
}

for (uint64_t I = 0; I < Size; ++I) {
Value *Offset = ConstantInt::get(Type::getInt32Ty(Ctx), I);
Value *Ptr = Builder.CreateGEP(ElemTy, Dst, Offset, "gep");
Value *Zero = Builder.getInt32(0);
Value *Offset = Builder.getInt32(I);
Value *Ptr = Builder.CreateGEP(ArrTy, Dst, {Zero, Offset}, "gep");
Builder.CreateStore(TypedVal, Ptr);
}
}
Expand Down Expand Up @@ -478,9 +478,9 @@ static void legalizeMemCpy(Instruction &I,
ToRemove.push_back(CI);
}

static void removeMemSet(Instruction &I,
SmallVectorImpl<Instruction *> &ToRemove,
DenseMap<Value *, Value *> &ReplacedValues) {
static void legalizeMemSet(Instruction &I,
SmallVectorImpl<Instruction *> &ToRemove,
DenseMap<Value *, Value *> &ReplacedValues) {

CallInst *CI = dyn_cast<CallInst>(&I);
if (!CI)
Expand Down Expand Up @@ -603,7 +603,7 @@ class DXILLegalizationPipeline {
LegalizationPipeline[Stage1].push_back(legalizeGetHighLowi64Bytes);
LegalizationPipeline[Stage1].push_back(legalizeFreeze);
LegalizationPipeline[Stage1].push_back(legalizeMemCpy);
LegalizationPipeline[Stage1].push_back(removeMemSet);
LegalizationPipeline[Stage1].push_back(legalizeMemSet);
LegalizationPipeline[Stage1].push_back(updateFnegToFsub);
// Note: legalizeGetHighLowi64Bytes and
// downcastI64toI32InsertExtractElements both modify extractelement, so they
Expand Down
56 changes: 28 additions & 28 deletions llvm/test/CodeGen/DirectX/legalize-memcpy.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,9 @@ define void @replace_int_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [1 x i32], align 4
; CHECK-NEXT: [[TMP2:%.*]] = alloca [1 x i32], align 4
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [1 x i32], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [1 x i32], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store i32 [[TMP3]], ptr [[GEP1]], align 4
; CHECK-NEXT: ret void
;
Expand All @@ -23,17 +23,17 @@ define void @replace_3int_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [3 x i32], align 4
; CHECK-NEXT: [[TMP2:%.*]] = alloca [3 x i32], align 4
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store i32 [[TMP3]], ptr [[GEP1]], align 4
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load i32, ptr [[GEP2]], align 4
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store i32 [[TMP4]], ptr [[GEP3]], align 4
; CHECK-NEXT: [[GEP4:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 2
; CHECK-NEXT: [[GEP4:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP1]], i32 0, i32 2
; CHECK-NEXT: [[TMP5:%.*]] = load i32, ptr [[GEP4]], align 4
; CHECK-NEXT: [[GEP5:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 2
; CHECK-NEXT: [[GEP5:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP2]], i32 0, i32 2
; CHECK-NEXT: store i32 [[TMP5]], ptr [[GEP5]], align 4
; CHECK-NEXT: ret void
;
Expand All @@ -48,13 +48,13 @@ define void @replace_mismatched_size_int_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [2 x i32], align 4
; CHECK-NEXT: [[TMP2:%.*]] = alloca [3 x i32], align 4
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [2 x i32], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store i32 [[TMP3]], ptr [[GEP1]], align 4
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x i32], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load i32, ptr [[GEP2]], align 4
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [3 x i32], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store i32 [[TMP4]], ptr [[GEP3]], align 4
; CHECK-NEXT: ret void
;
Expand All @@ -69,13 +69,13 @@ define void @replace_int16_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [2 x i16], align 2
; CHECK-NEXT: [[TMP2:%.*]] = alloca [2 x i16], align 2
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i16, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [2 x i16], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load i16, ptr [[GEP]], align 2
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds i16, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x i16], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store i16 [[TMP3]], ptr [[GEP1]], align 2
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds i16, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x i16], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load i16, ptr [[GEP2]], align 2
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds i16, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [2 x i16], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store i16 [[TMP4]], ptr [[GEP3]], align 2
; CHECK-NEXT: ret void
;
Expand All @@ -90,13 +90,13 @@ define void @replace_float_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [2 x float], align 4
; CHECK-NEXT: [[TMP2:%.*]] = alloca [2 x float], align 4
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [2 x float], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load float, ptr [[GEP]], align 4
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds float, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x float], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store float [[TMP3]], ptr [[GEP1]], align 4
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x float], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load float, ptr [[GEP2]], align 4
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds float, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [2 x float], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store float [[TMP4]], ptr [[GEP3]], align 4
; CHECK-NEXT: ret void
;
Expand All @@ -111,13 +111,13 @@ define void @replace_double_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [2 x double], align 4
; CHECK-NEXT: [[TMP2:%.*]] = alloca [2 x double], align 4
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds double, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [2 x double], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load double, ptr [[GEP]], align 8
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds double, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x double], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store double [[TMP3]], ptr [[GEP1]], align 8
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds double, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x double], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load double, ptr [[GEP2]], align 8
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds double, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [2 x double], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store double [[TMP4]], ptr [[GEP3]], align 8
; CHECK-NEXT: ret void
;
Expand All @@ -132,13 +132,13 @@ define void @replace_half_memcpy_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[TMP1:%.*]] = alloca [2 x half], align 2
; CHECK-NEXT: [[TMP2:%.*]] = alloca [2 x half], align 2
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds half, ptr [[TMP1]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [2 x half], ptr [[TMP1]], i32 0, i32 0
; CHECK-NEXT: [[TMP3:%.*]] = load half, ptr [[GEP]], align 2
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds half, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x half], ptr [[TMP2]], i32 0, i32 0
; CHECK-NEXT: store half [[TMP3]], ptr [[GEP1]], align 2
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds half, ptr [[TMP1]], i32 1
; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x half], ptr [[TMP1]], i32 0, i32 1
; CHECK-NEXT: [[TMP4:%.*]] = load half, ptr [[GEP2]], align 2
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds half, ptr [[TMP2]], i32 1
; CHECK-NEXT: [[GEP3:%.*]] = getelementptr inbounds [2 x half], ptr [[TMP2]], i32 0, i32 1
; CHECK-NEXT: store half [[TMP4]], ptr [[GEP3]], align 2
; CHECK-NEXT: ret void
;
Expand Down
20 changes: 10 additions & 10 deletions llvm/test/CodeGen/DirectX/legalize-memset.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,9 @@ define void @replace_float_memset_test() #0 {
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[ACCUM_I_FLAT:%.*]] = alloca [2 x float], align 4
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr float, ptr [[ACCUM_I_FLAT]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [2 x float], ptr [[ACCUM_I_FLAT]], i32 0, i32 0
; CHECK-NEXT: store float 0.000000e+00, ptr [[GEP]], align 4
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr float, ptr [[ACCUM_I_FLAT]], i32 1
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr [2 x float], ptr [[ACCUM_I_FLAT]], i32 0, i32 1
; CHECK-NEXT: store float 0.000000e+00, ptr [[GEP1]], align 4
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: ret void
Expand All @@ -25,9 +25,9 @@ define void @replace_half_memset_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[ACCUM_I_FLAT:%.*]] = alloca [2 x half], align 4
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr half, ptr [[ACCUM_I_FLAT]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [2 x half], ptr [[ACCUM_I_FLAT]], i32 0, i32 0
; CHECK-NEXT: store half 0xH0000, ptr [[GEP]], align 2
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr half, ptr [[ACCUM_I_FLAT]], i32 1
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr [2 x half], ptr [[ACCUM_I_FLAT]], i32 0, i32 1
; CHECK-NEXT: store half 0xH0000, ptr [[GEP1]], align 2
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: ret void
Expand All @@ -44,9 +44,9 @@ define void @replace_double_memset_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[ACCUM_I_FLAT:%.*]] = alloca [2 x double], align 4
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 16, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr double, ptr [[ACCUM_I_FLAT]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [2 x double], ptr [[ACCUM_I_FLAT]], i32 0, i32 0
; CHECK-NEXT: store double 0.000000e+00, ptr [[GEP]], align 8
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr double, ptr [[ACCUM_I_FLAT]], i32 1
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr [2 x double], ptr [[ACCUM_I_FLAT]], i32 0, i32 1
; CHECK-NEXT: store double 0.000000e+00, ptr [[GEP1]], align 8
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 16, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: ret void
Expand All @@ -63,9 +63,9 @@ define void @replace_int16_memset_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[CACHE_I:%.*]] = alloca [2 x i16], align 2
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[CACHE_I]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i16, ptr [[CACHE_I]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [2 x i16], ptr [[CACHE_I]], i32 0, i32 0
; CHECK-NEXT: store i16 0, ptr [[GEP]], align 2
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr i16, ptr [[CACHE_I]], i32 1
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr [2 x i16], ptr [[CACHE_I]], i32 0, i32 1
; CHECK-NEXT: store i16 0, ptr [[GEP1]], align 2
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[CACHE_I]])
; CHECK-NEXT: ret void
Expand All @@ -82,7 +82,7 @@ define void @replace_int_memset_test() #0 {
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT: [[ACCUM_I_FLAT:%.*]] = alloca [1 x i32], align 4
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[ACCUM_I_FLAT]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [1 x i32], ptr [[ACCUM_I_FLAT]], i32 0, i32 0
; CHECK-NEXT: store i32 0, ptr [[GEP]], align 4
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: ret void
Expand All @@ -102,7 +102,7 @@ define void @replace_int_memset_to_var_test() #0 {
; CHECK-NEXT: store i32 1, ptr [[I]], align 4
; CHECK-NEXT: [[I8_LOAD:%.*]] = load i32, ptr [[I]], align 4
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i32, ptr [[ACCUM_I_FLAT]], i32 0
; CHECK-NEXT: [[GEP:%.*]] = getelementptr [1 x i32], ptr [[ACCUM_I_FLAT]], i32 0, i32 0
; CHECK-NEXT: store i32 [[I8_LOAD]], ptr [[GEP]], align 4
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
; CHECK-NEXT: ret void
Expand Down
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