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[CIR] Fix alignment when lowering set/get bitfield operations #148999

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Merged
merged 3 commits into from
Jul 18, 2025
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[CIR] Fix alignment when lowering set/get bitfield operations #148999

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266483e
[CIR] Fix alignment when lowering set/get bitfield operations
Andres-Salamanca Jul 16, 2025
90dde10
Address review comments
Andres-Salamanca Jul 16, 2025
6001b12
Remove useVolatile to be added later
Andres-Salamanca Jul 18, 2025
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27 changes: 18 additions & 9 deletions clang/include/clang/CIR/Dialect/IR/CIROps.td
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Original file line number Diff line number Diff line change
Expand Up @@ -1720,20 +1720,24 @@ def SetBitfieldOp : CIR_Op<"set_bitfield"> {
%2 = cir.load %0 : !cir.ptr<!cir.ptr<!record_type>>, !cir.ptr<!record_type>
%3 = cir.get_member %2[1] {name = "e"} : !cir.ptr<!record_type>
-> !cir.ptr<!u16i>
%4 = cir.set_bitfield(#bfi_e, %3 : !cir.ptr<!u16i>, %1 : !s32i) -> !s32i
%4 = cir.set_bitfield align(4) (#bfi_e, %3 : !cir.ptr<!u16i>, %1 : !s32i)
-> !s32i
```
}];

let arguments = (ins
Arg<CIR_PointerType, "the address to store the value", [MemWrite]>:$addr,
CIR_AnyType:$src,
BitfieldInfoAttr:$bitfield_info,
DefaultValuedOptionalAttr<I64Attr, "0">:$alignment,
UnitAttr:$is_volatile
);

let results = (outs CIR_IntType:$result);

let assemblyFormat = [{ `(`$bitfield_info`,` $addr`:`qualified(type($addr))`,`
let assemblyFormat = [{
(`align` `(` $alignment^ `)`)?
`(`$bitfield_info`,` $addr`:`qualified(type($addr))`,`
$src`:`type($src) `)` attr-dict `->` type($result) }];

let builders = [
Expand All @@ -1745,14 +1749,15 @@ def SetBitfieldOp : CIR_Op<"set_bitfield"> {
"unsigned":$size,
"unsigned":$offset,
"bool":$is_signed,
"bool":$is_volatile
"bool":$is_volatile,
CArg<"unsigned", "0">:$alignment
),
[{
BitfieldInfoAttr info =
BitfieldInfoAttr::get($_builder.getContext(),
name, storage_type,
size, offset, is_signed);
build($_builder, $_state, type, addr, src, info, is_volatile);
build($_builder, $_state, type, addr, src, info, alignment, is_volatile);
}]>
];
}
Expand Down Expand Up @@ -1804,20 +1809,23 @@ def GetBitfieldOp : CIR_Op<"get_bitfield"> {
%2 = cir.load %0 : !cir.ptr<!cir.ptr<!record_type>>, !cir.ptr<!record_type>
%3 = cir.get_member %2[1] {name = "e"} : !cir.ptr<!record_type>
-> !cir.ptr<!u16i>
%4 = cir.get_bitfield(#bfi_e, %3 : !cir.ptr<!u16i>) -> !s32i
%4 = cir.get_bitfield align(4) (#bfi_e, %3 : !cir.ptr<!u16i>) -> !s32i
```
}];

let arguments = (ins
Arg<CIR_PointerType, "the address to load from", [MemRead]>:$addr,
BitfieldInfoAttr:$bitfield_info,
DefaultValuedOptionalAttr<I64Attr, "0">:$alignment,
UnitAttr:$is_volatile
);

let results = (outs CIR_IntType:$result);

let assemblyFormat = [{ `(`$bitfield_info `,` $addr attr-dict `:`
qualified(type($addr)) `)` `->` type($result) }];
let assemblyFormat = [{
(`align` `(` $alignment^ `)`)?
`(`$bitfield_info `,` $addr attr-dict `:`
qualified(type($addr)) `)` `->` type($result) }];

let builders = [
OpBuilder<(ins "mlir::Type":$type,
Expand All @@ -1827,14 +1835,15 @@ def GetBitfieldOp : CIR_Op<"get_bitfield"> {
"unsigned":$size,
"unsigned":$offset,
"bool":$is_signed,
"bool":$is_volatile
"bool":$is_volatile,
CArg<"unsigned", "0">:$alignment
),
[{
BitfieldInfoAttr info =
BitfieldInfoAttr::get($_builder.getContext(),
name, storage_type,
size, offset, is_signed);
build($_builder, $_state, type, addr, info, is_volatile);
build($_builder, $_state, type, addr, info, alignment, is_volatile);
}]>
];
}
Expand Down
18 changes: 10 additions & 8 deletions clang/lib/CIR/CodeGen/CIRGenBuilder.h
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Original file line number Diff line number Diff line change
Expand Up @@ -424,21 +424,23 @@ class CIRGenBuilderTy : public cir::CIRBaseBuilderTy {
}

mlir::Value createSetBitfield(mlir::Location loc, mlir::Type resultType,
mlir::Value dstAddr, mlir::Type storageType,
Address dstAddr, mlir::Type storageType,
mlir::Value src, const CIRGenBitFieldInfo &info,
bool isLvalueVolatile, bool useVolatile) {
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@xlauko xlauko Jul 18, 2025

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useVolatile is never used can we remove it? We can always add it later.

return create<cir::SetBitfieldOp>(loc, resultType, dstAddr, storageType,
src, info.name, info.size, info.offset,
info.isSigned, isLvalueVolatile);
return create<cir::SetBitfieldOp>(
loc, resultType, dstAddr.getPointer(), storageType, src, info.name,
info.size, info.offset, info.isSigned, isLvalueVolatile,
dstAddr.getAlignment().getAsAlign().value());
}

mlir::Value createGetBitfield(mlir::Location loc, mlir::Type resultType,
mlir::Value addr, mlir::Type storageType,
Address addr, mlir::Type storageType,
const CIRGenBitFieldInfo &info,
bool isLvalueVolatile, bool useVolatile) {
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@xlauko xlauko Jul 18, 2025

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useVolatile is never used can we remove it? We can always add it later.

return create<cir::GetBitfieldOp>(loc, resultType, addr, storageType,
info.name, info.size, info.offset,
info.isSigned, isLvalueVolatile);
return create<cir::GetBitfieldOp>(
loc, resultType, addr.getPointer(), storageType, info.name, info.size,
info.offset, info.isSigned, isLvalueVolatile,
addr.getAlignment().getAsAlign().value());
}
};

Expand Down
13 changes: 8 additions & 5 deletions clang/lib/CIR/CodeGen/CIRGenExpr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -337,7 +337,7 @@ mlir::Value CIRGenFunction::emitStoreThroughBitfieldLValue(RValue src,

mlir::Value dstAddr = dst.getAddress().getPointer();

return builder.createSetBitfield(dstAddr.getLoc(), resLTy, dstAddr,
return builder.createSetBitfield(dstAddr.getLoc(), resLTy, ptr,
ptr.getElementType(), src.getValue(), info,
dst.isVolatileQualified(), useVolatile);
}
Expand All @@ -351,9 +351,9 @@ RValue CIRGenFunction::emitLoadOfBitfieldLValue(LValue lv, SourceLocation loc) {

assert(!cir::MissingFeatures::armComputeVolatileBitfields());

mlir::Value field = builder.createGetBitfield(
getLoc(loc), resLTy, ptr.getPointer(), ptr.getElementType(), info,
lv.isVolatile(), false);
mlir::Value field =
builder.createGetBitfield(getLoc(loc), resLTy, ptr, ptr.getElementType(),
info, lv.isVolatile(), false);
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@xlauko xlauko Jul 18, 2025

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If the argument is to stay add comment to /*useVolatile=*/ false please, but we should remove it entirely as noted before.

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@Andres-Salamanca Andres-Salamanca Jul 18, 2025

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Done

assert(!cir::MissingFeatures::opLoadEmitScalarRangeCheck() && "NYI");
return RValue::get(field);
}
Expand All @@ -366,7 +366,10 @@ Address CIRGenFunction::getAddrOfBitFieldStorage(LValue base,
cir::PointerType fieldPtr = cir::PointerType::get(fieldType);
cir::GetMemberOp sea = getBuilder().createGetMember(
loc, fieldPtr, base.getPointer(), field->getName(), index);
return Address(sea, CharUnits::One());
auto rec = cast<cir::RecordType>(base.getAddress().getElementType());
CharUnits offset = CharUnits::fromQuantity(
rec.getElementOffset(cgm.getDataLayout().layout, index));
return Address(sea, base.getAlignment().alignmentAtOffset(offset));
}

LValue CIRGenFunction::emitLValueForBitField(LValue base,
Expand Down
7 changes: 4 additions & 3 deletions clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2555,7 +2555,7 @@ mlir::LogicalResult CIRToLLVMSetBitfieldOpLowering::matchAndRewrite(
assert(storageSize > size && "Invalid bitfield size.");

mlir::Value val = rewriter.create<mlir::LLVM::LoadOp>(
op.getLoc(), intType, adaptor.getAddr(), /* alignment */ 0,
op.getLoc(), intType, adaptor.getAddr(), op.getAlignment(),
op.getIsVolatile());

srcVal =
Expand All @@ -2572,7 +2572,7 @@ mlir::LogicalResult CIRToLLVMSetBitfieldOpLowering::matchAndRewrite(
}

rewriter.create<mlir::LLVM::StoreOp>(op.getLoc(), srcVal, adaptor.getAddr(),
/* alignment */ 0, op.getIsVolatile());
op.getAlignment(), op.getIsVolatile());

mlir::Type resultTy = getTypeConverter()->convertType(op.getType());

Expand Down Expand Up @@ -2646,7 +2646,8 @@ mlir::LogicalResult CIRToLLVMGetBitfieldOpLowering::matchAndRewrite(
computeBitfieldIntType(storageType, context, storageSize);

mlir::Value val = rewriter.create<mlir::LLVM::LoadOp>(
op.getLoc(), intType, adaptor.getAddr(), 0, op.getIsVolatile());
op.getLoc(), intType, adaptor.getAddr(), op.getAlignment(),
op.getIsVolatile());
val = rewriter.create<mlir::LLVM::BitcastOp>(op.getLoc(), intType, val);

if (info.getIsSigned()) {
Expand Down
46 changes: 23 additions & 23 deletions clang/test/CIR/CodeGen/bitfields.c
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Expand Up @@ -87,14 +87,14 @@ int load_field(S* s) {
// CIR: [[TMP0:%.*]] = cir.alloca !cir.ptr<!rec_S>, !cir.ptr<!cir.ptr<!rec_S>>, ["s", init]
// CIR: [[TMP1:%.*]] = cir.load{{.*}} [[TMP0]] : !cir.ptr<!cir.ptr<!rec_S>>, !cir.ptr<!rec_S>
// CIR: [[TMP2:%.*]] = cir.get_member [[TMP1]][0] {name = "c"} : !cir.ptr<!rec_S> -> !cir.ptr<!u64i>
// CIR: [[TMP3:%.*]] = cir.get_bitfield(#bfi_c, [[TMP2]] : !cir.ptr<!u64i>) -> !s32i
// CIR: [[TMP3:%.*]] = cir.get_bitfield align(4) (#bfi_c, [[TMP2]] : !cir.ptr<!u64i>) -> !s32i

// LLVM: define dso_local i32 @load_field
// LLVM: [[TMP0:%.*]] = alloca ptr, i64 1, align 8
// LLVM: [[TMP1:%.*]] = alloca i32, i64 1, align 4
// LLVM: [[TMP2:%.*]] = load ptr, ptr [[TMP0]], align 8
// LLVM: [[TMP3:%.*]] = getelementptr %struct.S, ptr [[TMP2]], i32 0, i32 0
// LLVM: [[TMP4:%.*]] = load i64, ptr [[TMP3]], align 8
// LLVM: [[TMP4:%.*]] = load i64, ptr [[TMP3]], align 4
// LLVM: [[TMP5:%.*]] = shl i64 [[TMP4]], 15
// LLVM: [[TMP6:%.*]] = ashr i64 [[TMP5]], 47
// LLVM: [[TMP7:%.*]] = trunc i64 [[TMP6]] to i32
Expand All @@ -115,13 +115,13 @@ unsigned int load_field_unsigned(A* s) {
//CIR: [[TMP0:%.*]] = cir.alloca !cir.ptr<!rec_A>, !cir.ptr<!cir.ptr<!rec_A>>, ["s", init] {alignment = 8 : i64}
//CIR: [[TMP1:%.*]] = cir.load align(8) [[TMP0]] : !cir.ptr<!cir.ptr<!rec_A>>, !cir.ptr<!rec_A>
//CIR: [[TMP2:%.*]] = cir.get_member [[TMP1]][3] {name = "more_bits"} : !cir.ptr<!rec_A> -> !cir.ptr<!u16i>
//CIR: [[TMP3:%.*]] = cir.get_bitfield(#bfi_more_bits, [[TMP2]] : !cir.ptr<!u16i>) -> !u32i
//CIR: [[TMP3:%.*]] = cir.get_bitfield align(1) (#bfi_more_bits, [[TMP2]] : !cir.ptr<!u16i>) -> !u32i

//LLVM: define dso_local i32 @load_field_unsigned
//LLVM: [[TMP0:%.*]] = alloca ptr, i64 1, align 8
//LLVM: [[TMP1:%.*]] = load ptr, ptr [[TMP0]], align 8
//LLVM: [[TMP2:%.*]] = getelementptr %struct.A, ptr [[TMP1]], i32 0, i32 3
//LLVM: [[TMP3:%.*]] = load i16, ptr [[TMP2]], align 2
//LLVM: [[TMP3:%.*]] = load i16, ptr [[TMP2]], align 1
//LLVM: [[TMP4:%.*]] = lshr i16 [[TMP3]], 3
//LLVM: [[TMP5:%.*]] = and i16 [[TMP4]], 15
//LLVM: [[TMP6:%.*]] = zext i16 [[TMP5]] to i32
Expand All @@ -143,15 +143,15 @@ void store_field() {
// CIR: [[TMP0:%.*]] = cir.alloca !rec_S, !cir.ptr<!rec_S>
// CIR: [[TMP1:%.*]] = cir.const #cir.int<3> : !s32i
// CIR: [[TMP2:%.*]] = cir.get_member [[TMP0]][1] {name = "e"} : !cir.ptr<!rec_S> -> !cir.ptr<!u16i>
// CIR: cir.set_bitfield(#bfi_e, [[TMP2]] : !cir.ptr<!u16i>, [[TMP1]] : !s32i)
// CIR: cir.set_bitfield align(4) (#bfi_e, [[TMP2]] : !cir.ptr<!u16i>, [[TMP1]] : !s32i)

// LLVM: define dso_local void @store_field()
// LLVM: [[TMP0:%.*]] = alloca %struct.S, i64 1, align 4
// LLVM: [[TMP1:%.*]] = getelementptr %struct.S, ptr [[TMP0]], i32 0, i32 1
// LLVM: [[TMP2:%.*]] = load i16, ptr [[TMP1]], align 2
// LLVM: [[TMP2:%.*]] = load i16, ptr [[TMP1]], align 4
// LLVM: [[TMP3:%.*]] = and i16 [[TMP2]], -32768
// LLVM: [[TMP4:%.*]] = or i16 [[TMP3]], 3
// LLVM: store i16 [[TMP4]], ptr [[TMP1]], align 2
// LLVM: store i16 [[TMP4]], ptr [[TMP1]], align 4

// OGCG: define dso_local void @store_field()
// OGCG: [[TMP0:%.*]] = alloca %struct.S, align 4
Expand All @@ -169,24 +169,24 @@ void store_bitfield_to_bitfield() {
// CIR: cir.func {{.*@store_bitfield_to_bitfield}}
// CIR: [[TMP0:%.*]] = cir.alloca !rec_S, !cir.ptr<!rec_S>, ["s"] {alignment = 4 : i64}
// CIR: [[TMP1:%.*]] = cir.get_member [[TMP0]][0] {name = "c"} : !cir.ptr<!rec_S> -> !cir.ptr<!u64i>
// CIR: [[TMP2:%.*]] = cir.get_bitfield(#bfi_c, [[TMP1]] : !cir.ptr<!u64i>) -> !s32i
// CIR: [[TMP2:%.*]] = cir.get_bitfield align(4) (#bfi_c, [[TMP1]] : !cir.ptr<!u64i>) -> !s32i
// CIR: [[TMP3:%.*]] = cir.get_member [[TMP0]][0] {name = "a"} : !cir.ptr<!rec_S> -> !cir.ptr<!u64i>
// CIR: [[TMP4:%.*]] = cir.set_bitfield(#bfi_a, [[TMP3]] : !cir.ptr<!u64i>, [[TMP2]] : !s32i) -> !s32i
// CIR: [[TMP4:%.*]] = cir.set_bitfield align(4) (#bfi_a, [[TMP3]] : !cir.ptr<!u64i>, [[TMP2]] : !s32i) -> !s32i

// LLVM: define dso_local void @store_bitfield_to_bitfield()
// LLVM: [[TMP0:%.*]] = alloca %struct.S, i64 1, align 4
// LLVM: [[TMP1:%.*]] = getelementptr %struct.S, ptr [[TMP0]], i32 0, i32 0
// LLVM: [[TMP2:%.*]] = load i64, ptr [[TMP1]], align 8
// LLVM: [[TMP2:%.*]] = load i64, ptr [[TMP1]], align 4
// LLVM: [[TMP3:%.*]] = shl i64 [[TMP2]], 15
// LLVM: [[TMP4:%.*]] = ashr i64 [[TMP3]], 47
// LLVM: [[TMP5:%.*]] = trunc i64 [[TMP4]] to i32
// LLVM: [[TMP6:%.*]] = getelementptr %struct.S, ptr [[TMP0]], i32 0, i32 0
// LLVM: [[TMP7:%.*]] = zext i32 [[TMP5]] to i64
// LLVM: [[TMP8:%.*]] = load i64, ptr [[TMP6]], align 8
// LLVM: [[TMP8:%.*]] = load i64, ptr [[TMP6]], align 4
// LLVM: [[TMP9:%.*]] = and i64 [[TMP7]], 15
// LLVM: [[TMP10:%.*]] = and i64 [[TMP8]], -16
// LLVM: [[TMP11:%.*]] = or i64 [[TMP10]], [[TMP9]]
// LLVM: store i64 [[TMP11]], ptr [[TMP6]], align 8
// LLVM: store i64 [[TMP11]], ptr [[TMP6]], align 4
// LLVM: [[TMP12:%.*]] = shl i64 [[TMP9]], 60
// LLVM: [[TMP13:%.*]] = ashr i64 [[TMP12]], 60
// LLVM: [[TMP15:%.*]] = trunc i64 [[TMP13]] to i32
Expand Down Expand Up @@ -222,16 +222,16 @@ void get_volatile(V* v) {
// CIR: [[TMP1:%.*]] = cir.const #cir.int<3> : !s32i
// CIR: [[TMP2:%.*]] = cir.load align(8) [[TMP0]] : !cir.ptr<!cir.ptr<!rec_V>>, !cir.ptr<!rec_V>
// CIR: [[TMP3:%.*]] = cir.get_member [[TMP2]][0] {name = "b"} : !cir.ptr<!rec_V> -> !cir.ptr<!u64i>
// CIR: [[TMP4:%.*]] = cir.set_bitfield(#bfi_b, [[TMP3]] : !cir.ptr<!u64i>, [[TMP1]] : !s32i) {is_volatile} -> !s32i
// CIR: [[TMP4:%.*]] = cir.set_bitfield align(4) (#bfi_b, [[TMP3]] : !cir.ptr<!u64i>, [[TMP1]] : !s32i) {is_volatile} -> !s32i

// LLVM: define dso_local void @get_volatile
// LLVM: [[TMP0:%.*]] = alloca ptr, i64 1, align 8
// LLVM: [[TMP1:%.*]] = load ptr, ptr [[TMP0]], align 8
// LLVM: [[TMP2:%.*]] = getelementptr %struct.V, ptr [[TMP1]], i32 0, i32 0
// LLVM: [[TMP3:%.*]] = load volatile i64, ptr [[TMP2]], align 8
// LLVM: [[TMP3:%.*]] = load volatile i64, ptr [[TMP2]], align 4
// LLVM: [[TMP4:%.*]] = and i64 [[TMP3]], -1095216660481
// LLVM: [[TMP5:%.*]] = or i64 [[TMP4]], 12884901888
// LLVM: store volatile i64 [[TMP5]], ptr [[TMP2]], align 8
// LLVM: store volatile i64 [[TMP5]], ptr [[TMP2]], align 4

// OCGC: define dso_local void @get_volatile
// OCGC: [[TMP0:%.*]] = alloca ptr, align 8
Expand All @@ -249,16 +249,16 @@ void set_volatile(V* v) {
//CIR: [[TMP1:%.*]] = cir.const #cir.int<3> : !s32i
//CIR: [[TMP2:%.*]] = cir.load align(8) [[TMP0]] : !cir.ptr<!cir.ptr<!rec_V>>, !cir.ptr<!rec_V>
//CIR: [[TMP3:%.*]] = cir.get_member [[TMP2]][0] {name = "b"} : !cir.ptr<!rec_V> -> !cir.ptr<!u64i>
//CIR: [[TMP4:%.*]] = cir.set_bitfield(#bfi_b, [[TMP3]] : !cir.ptr<!u64i>, [[TMP1]] : !s32i) {is_volatile} -> !s32i
//CIR: [[TMP4:%.*]] = cir.set_bitfield align(4) (#bfi_b, [[TMP3]] : !cir.ptr<!u64i>, [[TMP1]] : !s32i) {is_volatile} -> !s32i

// LLVM: define dso_local void @set_volatile
// LLVM: [[TMP0:%.*]] = alloca ptr, i64 1, align 8
// LLVM: [[TMP1:%.*]] = load ptr, ptr [[TMP0]], align 8
// LLVM: [[TMP2:%.*]] = getelementptr %struct.V, ptr [[TMP1]], i32 0, i32 0
// LLVM: [[TMP3:%.*]] = load volatile i64, ptr [[TMP2]], align 8
// LLVM: [[TMP3:%.*]] = load volatile i64, ptr [[TMP2]], align 4
// LLVM: [[TMP4:%.*]] = and i64 [[TMP3]], -1095216660481
// LLVM: [[TMP5:%.*]] = or i64 [[TMP4]], 12884901888
// LLVM: store volatile i64 [[TMP5]], ptr [[TMP2]], align 8
// LLVM: store volatile i64 [[TMP5]], ptr [[TMP2]], align 4

// OGCG: define dso_local void @set_volatile
// OGCG: [[TMP0:%.*]] = alloca ptr, align 8
Expand All @@ -276,24 +276,24 @@ void unOp(S* s) {
// CIR: [[TMP0:%.*]] = cir.alloca !cir.ptr<!rec_S>, !cir.ptr<!cir.ptr<!rec_S>>, ["s", init] {alignment = 8 : i64}
// CIR: [[TMP1:%.*]] = cir.load align(8) [[TMP0]] : !cir.ptr<!cir.ptr<!rec_S>>, !cir.ptr<!rec_S>
// CIR: [[TMP2:%.*]] = cir.get_member [[TMP1]][0] {name = "d"} : !cir.ptr<!rec_S> -> !cir.ptr<!u64i>
// CIR: [[TMP3:%.*]] = cir.get_bitfield(#bfi_d, [[TMP2]] : !cir.ptr<!u64i>) -> !s32i
// CIR: [[TMP3:%.*]] = cir.get_bitfield align(4) (#bfi_d, [[TMP2]] : !cir.ptr<!u64i>) -> !s32i
// CIR: [[TMP4:%.*]] = cir.unary(inc, [[TMP3]]) nsw : !s32i, !s32i
// CIR: cir.set_bitfield(#bfi_d, [[TMP2]] : !cir.ptr<!u64i>, [[TMP4]] : !s32i)
// CIR: cir.set_bitfield align(4) (#bfi_d, [[TMP2]] : !cir.ptr<!u64i>, [[TMP4]] : !s32i)

// LLVM: define {{.*@unOp}}
// LLVM: [[TMP0:%.*]] = getelementptr %struct.S, ptr [[LOAD0:%.*]], i32 0, i32 0
// LLVM: [[TMP1:%.*]] = load i64, ptr [[TMP0]], align 8
// LLVM: [[TMP1:%.*]] = load i64, ptr [[TMP0]], align 4
// LLVM: [[TMP2:%.*]] = shl i64 [[TMP1]], 13
// LLVM: [[TMP3:%.*]] = ashr i64 [[TMP2]], 62
// LLVM: [[TMP4:%.*]] = trunc i64 [[TMP3]] to i32
// LLVM: [[TMP5:%.*]] = add nsw i32 [[TMP4]], 1
// LLVM: [[TMP6:%.*]] = zext i32 [[TMP5]] to i64
// LLVM: [[TMP7:%.*]] = load i64, ptr [[TMP0]], align 8
// LLVM: [[TMP7:%.*]] = load i64, ptr [[TMP0]], align 4
// LLVM: [[TMP8:%.*]] = and i64 [[TMP6]], 3
// LLVM: [[TMP9:%.*]] = shl i64 [[TMP8]], 49
// LLVM: [[TMP10:%.*]] = and i64 [[TMP7]], -1688849860263937
// LLVM: [[TMP11:%.*]] = or i64 [[TMP10]], [[TMP9]]
// LLVM: store i64 [[TMP11]], ptr [[TMP0]], align 8
// LLVM: store i64 [[TMP11]], ptr [[TMP0]], align 4
// LLVM: [[TMP12:%.*]] = shl i64 [[TMP8]], 62
// LLVM: [[TMP13:%.*]] = ashr i64 [[TMP12]], 62
// LLVM: [[TMP14:%.*]] = trunc i64 [[TMP13]] to i32
Expand Down
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