https://github.com/el-ev created
https://github.com/llvm/llvm-project/pull/137501
Closes #136059
>From f27d8d2f2ecbf65479601f1d21206b1cb4d9ef6a Mon Sep 17 00:00:00 2001
From: Iris Shi <0...@owo.li>
Date: Sun, 27 Apr 2025 15:16:19 +0800
Subject: [PATCH] [CIR] Upstream initial support for union type
---
.../include/clang/CIR/Dialect/IR/CIRTypes.td | 1 +
clang/lib/CIR/CodeGen/CIRGenExpr.cpp | 25 ++--
clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp | 2 +-
.../CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp | 93 +++++++++++-
clang/lib/CIR/Dialect/IR/CIRTypes.cpp | 39 +++--
.../CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp | 15 +-
clang/test/CIR/CodeGen/union.c | 135 +++++++++++++++++-
7 files changed, 275 insertions(+), 35 deletions(-)
diff --git a/clang/include/clang/CIR/Dialect/IR/CIRTypes.td
b/clang/include/clang/CIR/Dialect/IR/CIRTypes.td
index 0a821e152d353..afb7da1fa011d 100644
--- a/clang/include/clang/CIR/Dialect/IR/CIRTypes.td
+++ b/clang/include/clang/CIR/Dialect/IR/CIRTypes.td
@@ -494,6 +494,7 @@ def CIR_RecordType : CIR_Type<"Record", "record",
bool isComplete() const { return !isIncomplete(); };
bool isIncomplete() const;
+ mlir::Type getLargestMember(const mlir::DataLayout &dataLayout) const;
size_t getNumElements() const { return getMembers().size(); };
std::string getKindAsStr() {
switch (getKind()) {
diff --git a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
index 0a518c0fd935d..f3bcffe042280 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExpr.cpp
@@ -317,20 +317,25 @@ LValue CIRGenFunction::emitLValueForField(LValue base,
const FieldDecl *field) {
}
unsigned recordCVR = base.getVRQualifiers();
- if (rec->isUnion()) {
- cgm.errorNYI(field->getSourceRange(), "emitLValueForField: union");
- return LValue();
- }
- assert(!cir::MissingFeatures::preservedAccessIndexRegion());
llvm::StringRef fieldName = field->getName();
- const CIRGenRecordLayout &layout =
- cgm.getTypes().getCIRGenRecordLayout(field->getParent());
- unsigned fieldIndex = layout.getCIRFieldNo(field);
- assert(!cir::MissingFeatures::lambdaFieldToName());
+ if (rec->isUnion()) {
+ unsigned fieldIndex = field->getFieldIndex();
+ assert(!cir::MissingFeatures::lambdaFieldToName());
+ addr = emitAddrOfFieldStorage(addr, field, fieldName, fieldIndex);
- addr = emitAddrOfFieldStorage(addr, field, fieldName, fieldIndex);
+ } else {
+ assert(!cir::MissingFeatures::preservedAccessIndexRegion());
+
+ const CIRGenRecordLayout &layout =
+ cgm.getTypes().getCIRGenRecordLayout(field->getParent());
+ unsigned fieldIndex = layout.getCIRFieldNo(field);
+
+ assert(!cir::MissingFeatures::lambdaFieldToName());
+
+ addr = emitAddrOfFieldStorage(addr, field, fieldName, fieldIndex);
+ }
// If this is a reference field, load the reference right now.
if (fieldType->isReferenceType()) {
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp
b/clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp
index 368a6cb27c0fd..e006a77c6e7d6 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp
@@ -1,4 +1,4 @@
-//===--- CIRGenExprAgg.cpp - Emit CIR Code from Aggregate Expressions
-----===//
+//===- CIRGenExprAggregrate.cpp - Emit CIR Code from Aggregate Expressions
===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
diff --git a/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
b/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
index 83aba256cd48e..778a178505684 100644
--- a/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenRecordLayoutBuilder.cpp
@@ -56,7 +56,7 @@ struct CIRRecordLowering final {
};
// The constructor.
CIRRecordLowering(CIRGenTypes &cirGenTypes, const RecordDecl *recordDecl,
- bool isPacked);
+ bool packed);
/// Constructs a MemberInfo instance from an offset and mlir::Type.
MemberInfo makeStorageInfo(CharUnits offset, mlir::Type data) {
@@ -64,6 +64,7 @@ struct CIRRecordLowering final {
}
void lower();
+ void lowerUnion();
/// Determines if we need a packed llvm struct.
void determinePacked();
@@ -83,6 +84,10 @@ struct CIRRecordLowering final {
return CharUnits::fromQuantity(dataLayout.layout.getTypeABIAlignment(Ty));
}
+ bool isZeroInitializable(const FieldDecl *fd) {
+ return cirGenTypes.isZeroInitializable(fd->getType());
+ }
+
/// Wraps cir::IntType with some implicit arguments.
mlir::Type getUIntNType(uint64_t numBits) {
unsigned alignedBits = llvm::PowerOf2Ceil(numBits);
@@ -121,6 +126,13 @@ struct CIRRecordLowering final {
/// Fills out the structures that are ultimately consumed.
void fillOutputFields();
+ void appendPaddingBytes(CharUnits size) {
+ if (!size.isZero()) {
+ fieldTypes.push_back(getByteArrayType(size));
+ padded = true;
+ }
+ }
+
CIRGenTypes &cirGenTypes;
CIRGenBuilderTy &builder;
const ASTContext &astContext;
@@ -136,6 +148,8 @@ struct CIRRecordLowering final {
LLVM_PREFERRED_TYPE(bool)
unsigned zeroInitializable : 1;
LLVM_PREFERRED_TYPE(bool)
+ unsigned zeroInitializableAsBase : 1;
+ LLVM_PREFERRED_TYPE(bool)
unsigned packed : 1;
LLVM_PREFERRED_TYPE(bool)
unsigned padded : 1;
@@ -148,18 +162,19 @@ struct CIRRecordLowering final {
CIRRecordLowering::CIRRecordLowering(CIRGenTypes &cirGenTypes,
const RecordDecl *recordDecl,
- bool isPacked)
+ bool packed)
: cirGenTypes(cirGenTypes), builder(cirGenTypes.getBuilder()),
astContext(cirGenTypes.getASTContext()), recordDecl(recordDecl),
astRecordLayout(
cirGenTypes.getASTContext().getASTRecordLayout(recordDecl)),
dataLayout(cirGenTypes.getCGModule().getModule()),
- zeroInitializable(true), packed(isPacked), padded(false) {}
+ zeroInitializable(true), zeroInitializableAsBase(true), packed(packed),
+ padded(false) {}
void CIRRecordLowering::lower() {
if (recordDecl->isUnion()) {
- cirGenTypes.getCGModule().errorNYI(recordDecl->getSourceRange(),
- "lower: union");
+ lowerUnion();
+ assert(!cir::MissingFeatures::bitfields());
return;
}
@@ -306,3 +321,71 @@ CIRGenTypes::computeRecordLayout(const RecordDecl *rd,
cir::RecordType *ty) {
// TODO: implement verification
return rl;
}
+
+void CIRRecordLowering::lowerUnion() {
+ CharUnits layoutSize = astRecordLayout.getSize();
+ mlir::Type storageType = nullptr;
+ bool seenNamedMember = false;
+
+ // Iterate through the fields setting bitFieldInfo and the Fields array. Also
+ // locate the "most appropriate" storage type. The heuristic for finding the
+ // storage type isn't necessary, the first (non-0-length-bitfield) field's
+ // type would work fine and be simpler but would be different than what we've
+ // been doing and cause lit tests to change.
+ for (const FieldDecl *field : recordDecl->fields()) {
+ mlir::Type fieldType;
+ if (field->isBitField())
+ cirGenTypes.getCGModule().errorNYI(recordDecl->getSourceRange(),
+ "bitfields in lowerUnion");
+ else
+ fieldType = getStorageType(field);
+
+ fields[field->getCanonicalDecl()] = 0;
+
+ // Compute zero-initializable status.
+ // This union might not be zero initialized: it may contain a pointer to
+ // data member which might have some exotic initialization sequence.
+ // If this is the case, then we aught not to try and come up with a
"better"
+ // type, it might not be very easy to come up with a Constant which
+ // correctly initializes it.
+ if (!seenNamedMember) {
+ seenNamedMember = field->getIdentifier();
+ if (!seenNamedMember)
+ if (const RecordDecl *fieldRD = field->getType()->getAsRecordDecl())
+ seenNamedMember = fieldRD->findFirstNamedDataMember();
+ if (seenNamedMember && !isZeroInitializable(field)) {
+ zeroInitializable = zeroInitializableAsBase = false;
+ storageType = fieldType;
+ }
+ }
+
+ // Because our union isn't zero initializable, we won't be getting a better
+ // storage type.
+ if (!zeroInitializable)
+ continue;
+
+ // Conditionally update our storage type if we've got a new "better" one.
+ if (!storageType || getAlignment(fieldType) > getAlignment(storageType) ||
+ (getAlignment(fieldType) == getAlignment(storageType) &&
+ getSize(fieldType) > getSize(storageType)))
+ storageType = fieldType;
+
+ // NOTE(cir): Track all union member's types, not just the largest one. It
+ // allows for proper type-checking and retain more info for analisys.
+ fieldTypes.push_back(fieldType);
+ }
+
+ if (!storageType)
+ cirGenTypes.getCGModule().errorNYI(recordDecl->getSourceRange(),
+ "No-storage Union NYI");
+
+ if (layoutSize < getSize(storageType))
+ storageType = getByteArrayType(layoutSize);
+
+ // NOTE(cir): Defer padding calculations to the lowering process.
+ appendPaddingBytes(layoutSize - getSize(storageType));
+
+ // Set packed if we need it.
+ if (layoutSize % getAlignment(storageType))
+ packed = true;
+}
diff --git a/clang/lib/CIR/Dialect/IR/CIRTypes.cpp
b/clang/lib/CIR/Dialect/IR/CIRTypes.cpp
index c6133b9a20e4f..38ac14f80c06c 100644
--- a/clang/lib/CIR/Dialect/IR/CIRTypes.cpp
+++ b/clang/lib/CIR/Dialect/IR/CIRTypes.cpp
@@ -230,6 +230,31 @@ void RecordType::complete(ArrayRef<Type> members, bool
packed, bool padded) {
llvm_unreachable("failed to complete record");
}
+/// Return the largest member of in the type.
+///
+/// Recurses into union members never returning a union as the largest member.
+Type RecordType::getLargestMember(const ::mlir::DataLayout &dataLayout) const {
+ assert(isUnion() && "Only call getLargestMember on unions");
+ Type largestMember;
+ unsigned largestMemberSize = 0;
+ unsigned numElements = getNumElements();
+ auto members = getMembers();
+ if (getPadded())
+ numElements -= 1; // The last element is padding.
+ for (unsigned i = 0; i < numElements; ++i) {
+ Type ty = members[i];
+ if (!largestMember || dataLayout.getTypeABIAlignment(ty) >
+ dataLayout.getTypeABIAlignment(largestMember) ||
+ (dataLayout.getTypeABIAlignment(ty) ==
+ dataLayout.getTypeABIAlignment(largestMember) &&
+ dataLayout.getTypeSize(ty) > largestMemberSize)) {
+ largestMember = ty;
+ largestMemberSize = dataLayout.getTypeSize(largestMember);
+ }
+ }
+ return largestMember;
+}
+
//===----------------------------------------------------------------------===//
// Data Layout information for types
//===----------------------------------------------------------------------===//
@@ -237,10 +262,8 @@ void RecordType::complete(ArrayRef<Type> members, bool
packed, bool padded) {
llvm::TypeSize
RecordType::getTypeSizeInBits(const mlir::DataLayout &dataLayout,
mlir::DataLayoutEntryListRef params) const {
- if (isUnion()) {
- // TODO(CIR): Implement union layout.
- return llvm::TypeSize::getFixed(8);
- }
+ if (isUnion())
+ return dataLayout.getTypeSize(getLargestMember(dataLayout));
unsigned recordSize = computeStructSize(dataLayout);
return llvm::TypeSize::getFixed(recordSize * 8);
@@ -249,10 +272,8 @@ RecordType::getTypeSizeInBits(const mlir::DataLayout
&dataLayout,
uint64_t
RecordType::getABIAlignment(const ::mlir::DataLayout &dataLayout,
::mlir::DataLayoutEntryListRef params) const {
- if (isUnion()) {
- // TODO(CIR): Implement union layout.
- return 8;
- }
+ if (isUnion())
+ return dataLayout.getTypeABIAlignment(getLargestMember(dataLayout));
// Packed structures always have an ABI alignment of 1.
if (getPacked())
@@ -268,8 +289,6 @@ RecordType::computeStructSize(const mlir::DataLayout
&dataLayout) const {
unsigned recordSize = 0;
uint64_t recordAlignment = 1;
- // We can't use a range-based for loop here because we might be ignoring the
- // last element.
for (mlir::Type ty : getMembers()) {
// This assumes that we're calculating size based on the ABI alignment, not
// the preferred alignment for each type.
diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
index 8bb27942d9646..0dba45a5aba35 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
@@ -1431,7 +1431,14 @@ static void prepareTypeConverter(mlir::LLVMTypeConverter
&converter,
break;
// Unions are lowered as only the largest member.
case cir::RecordType::Union:
- llvm_unreachable("Lowering of unions is NYI");
+ if (auto largestMember = type.getLargestMember(dataLayout))
+ llvmMembers.push_back(
+ convertTypeForMemory(converter, dataLayout, largestMember));
+ if (type.getPadded()) {
+ auto last = *type.getMembers().rbegin();
+ llvmMembers.push_back(
+ convertTypeForMemory(converter, dataLayout, last));
+ }
break;
}
@@ -1604,7 +1611,11 @@ mlir::LogicalResult
CIRToLLVMGetMemberOpLowering::matchAndRewrite(
return mlir::success();
}
case cir::RecordType::Union:
- return op.emitError() << "NYI: union get_member lowering";
+ // Union members share the address space, so we just need a bitcast to
+ // conform to type-checking.
+ rewriter.replaceOpWithNewOp<mlir::LLVM::BitcastOp>(op, llResTy,
+ adaptor.getAddr());
+ return mlir::success();
}
}
diff --git a/clang/test/CIR/CodeGen/union.c b/clang/test/CIR/CodeGen/union.c
index c4db37f835add..71cb9c2b20ca1 100644
--- a/clang/test/CIR/CodeGen/union.c
+++ b/clang/test/CIR/CodeGen/union.c
@@ -5,25 +5,146 @@
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o %t.ll
// RUN: FileCheck --check-prefix=OGCG --input-file=%t.ll %s
+union U1 {
+ int n;
+ char c;
+};
+
+// CIR: !rec_U1 = !cir.record<union "U1" {!s32i, !s8i}>
+// LLVM: %union.U1 = type { i32 }
+// OGCG: %union.U1 = type { i32 }
+
+union U2 {
+ char b;
+ short s;
+ int i;
+ float f;
+ double d;
+};
+
+// CIR: !rec_U2 = !cir.record<union "U2" {!s8i, !s16i, !s32i, !cir.float,
!cir.double}>
+// LLVM: %union.U2 = type { double }
+// OGCG: %union.U2 = type { double }
+
union IncompleteU *p;
-// CIR: cir.global external @p = #cir.ptr<null> : !cir.ptr<!rec_IncompleteU>
+// CIR: cir.global external @p = #cir.ptr<null> : !cir.ptr<!rec_IncompleteU>
// LLVM: @p = dso_local global ptr null
// OGCG: @p = global ptr null, align 8
-void f(void) {
+void f1(void) {
union IncompleteU *p;
}
-// CIR: cir.func @f()
-// CIR-NEXT: cir.alloca !cir.ptr<!rec_IncompleteU>,
!cir.ptr<!cir.ptr<!rec_IncompleteU>>, ["p"]
-// CIR-NEXT: cir.return
+// CIR: cir.func @f1()
+// CIR-NEXT: cir.alloca !cir.ptr<!rec_IncompleteU>,
!cir.ptr<!cir.ptr<!rec_IncompleteU>>, ["p"]
+// CIR-NEXT: cir.return
-// LLVM: define void @f()
+// LLVM: define void @f1()
// LLVM-NEXT: %[[P:.*]] = alloca ptr, i64 1, align 8
// LLVM-NEXT: ret void
-// OGCG: define{{.*}} void @f()
+// OGCG: define{{.*}} void @f1()
// OGCG-NEXT: entry:
// OGCG-NEXT: %[[P:.*]] = alloca ptr, align 8
// OGCG-NEXT: ret void
+
+int f2(void) {
+ union U1 u;
+ u.n = 42;
+ return u.n;
+}
+
+// CIR: cir.func @f2() -> !s32i
+// CIR-NEXT: %0 = cir.alloca !s32i, !cir.ptr<!s32i>, ["__retval"] {alignment
= 4 : i64}
+// CIR-NEXT: %1 = cir.alloca !rec_U1, !cir.ptr<!rec_U1>, ["u"] {alignment =
4 : i64}
+// CIR-NEXT: %2 = cir.const #cir.int<42> : !s32i
+// CIR-NEXT: %3 = cir.get_member %1[0] {name = "n"} : !cir.ptr<!rec_U1> ->
!cir.ptr<!s32i>
+// CIR-NEXT: cir.store %2, %3 : !s32i, !cir.ptr<!s32i>
+// CIR-NEXT: %4 = cir.get_member %1[0] {name = "n"} : !cir.ptr<!rec_U1> ->
!cir.ptr<!s32i>
+// CIR-NEXT: %5 = cir.load %4 : !cir.ptr<!s32i>, !s32i
+// CIR-NEXT: cir.store %5, %0 : !s32i, !cir.ptr<!s32i>
+// CIR-NEXT: %6 = cir.load %0 : !cir.ptr<!s32i>, !s32i
+// CIR-NEXT: cir.return %6 : !s32i
+
+// LLVM: define i32 @f2()
+// LLVM-NEXT: %1 = alloca i32, i64 1, align 4
+// LLVM-NEXT: %2 = alloca %union.U1, i64 1, align 4
+// LLVM-NEXT: store i32 42, ptr %2, align 4
+// LLVM-NEXT: %3 = load i32, ptr %2, align 4
+// LLVM-NEXT: store i32 %3, ptr %1, align 4
+// LLVM-NEXT: %4 = load i32, ptr %1, align 4
+// LLVM-NEXT: ret i32 %4
+
+// OGCG: define dso_local i32 @f2()
+// OGCG-NEXT: entry:
+// OGCG-NEXT: %u = alloca %union.U1, align 4
+// OGCG-NEXT: store i32 42, ptr %u, align 4
+// OGCG-NEXT: %0 = load i32, ptr %u, align 4
+// OGCG-NEXT: ret i32 %0
+
+
+void shouldGenerateUnionAccess(union U2 u) {
+ u.b = 0;
+ u.b;
+ u.i = 1;
+ u.i;
+ u.f = 0.1F;
+ u.f;
+ u.d = 0.1;
+ u.d;
+}
+
+// CIR: cir.func @shouldGenerateUnionAccess(%arg0: !rec_U2
+// CIR-NEXT: %0 = cir.alloca !rec_U2, !cir.ptr<!rec_U2>, ["u", init]
{alignment = 8 : i64}
+// CIR-NEXT: cir.store %arg0, %0 : !rec_U2, !cir.ptr<!rec_U2>
+// CIR-NEXT: %1 = cir.const #cir.int<0> : !s32i
+// CIR-NEXT: %2 = cir.cast(integral, %1 : !s32i), !s8i
+// CIR-NEXT: %3 = cir.get_member %0[0] {name = "b"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!s8i>
+// CIR-NEXT: cir.store %2, %3 : !s8i, !cir.ptr<!s8i>
+// CIR-NEXT: %4 = cir.get_member %0[0] {name = "b"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!s8i>
+// CIR-NEXT: %5 = cir.load %4 : !cir.ptr<!s8i>, !s8i
+// CIR-NEXT: %6 = cir.const #cir.int<1> : !s32i
+// CIR-NEXT: %7 = cir.get_member %0[2] {name = "i"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!s32i>
+// CIR-NEXT: cir.store %6, %7 : !s32i, !cir.ptr<!s32i>
+// CIR-NEXT: %8 = cir.get_member %0[2] {name = "i"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!s32i>
+// CIR-NEXT: %9 = cir.load %8 : !cir.ptr<!s32i>, !s32i
+// CIR-NEXT: %10 = cir.const #cir.fp<1.000000e-01> : !cir.float
+// CIR-NEXT: %11 = cir.get_member %0[3] {name = "f"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!cir.float>
+// CIR-NEXT: cir.store %10, %11 : !cir.float, !cir.ptr<!cir.float>
+// CIR-NEXT: %12 = cir.get_member %0[3] {name = "f"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!cir.float>
+// CIR-NEXT: %13 = cir.load %12 : !cir.ptr<!cir.float>, !cir.float
+// CIR-NEXT: %14 = cir.const #cir.fp<1.000000e-01> : !cir.double
+// CIR-NEXT: %15 = cir.get_member %0[4] {name = "d"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!cir.double>
+// CIR-NEXT: cir.store %14, %15 : !cir.double, !cir.ptr<!cir.double>
+// CIR-NEXT: %16 = cir.get_member %0[4] {name = "d"} : !cir.ptr<!rec_U2> ->
!cir.ptr<!cir.double>
+// CIR-NEXT: %17 = cir.load %16 : !cir.ptr<!cir.double>, !cir.double
+// CIR-NEXT: cir.return
+
+// LLVM: define void @shouldGenerateUnionAccess(%union.U2 %0) {
+// LLVM-NEXT: %2 = alloca %union.U2, i64 1, align 8
+// LLVM-NEXT: store %union.U2 %0, ptr %2, align 8
+// LLVM-NEXT: store i8 0, ptr %2, align 1
+// LLVM-NEXT: %3 = load i8, ptr %2, align 1
+// LLVM-NEXT: store i32 1, ptr %2, align 4
+// LLVM-NEXT: %4 = load i32, ptr %2, align 4
+// LLVM-NEXT: store float 0x3FB99999A0000000, ptr %2, align 4
+// LLVM-NEXT: %5 = load float, ptr %2, align 4
+// LLVM-NEXT: store double 1.000000e-01, ptr %2, align 8
+// LLVM-NEXT: %6 = load double, ptr %2, align 8
+// LLVM-NEXT: ret void
+
+// OGCG: define dso_local void @shouldGenerateUnionAccess(i64 %u.coerce)
#0 {
+// OGCG-NEXT: entry:
+// OGCG-NEXT: %u = alloca %union.U2, align 8
+// OGCG-NEXT: %coerce.dive = getelementptr inbounds nuw %union.U2, ptr %u,
i32 0, i32 0
+// OGCG-NEXT: store i64 %u.coerce, ptr %coerce.dive, align 8
+// OGCG-NEXT: store i8 0, ptr %u, align 8
+// OGCG-NEXT: %0 = load i8, ptr %u, align 8
+// OGCG-NEXT: store i32 1, ptr %u, align 8
+// OGCG-NEXT: %1 = load i32, ptr %u, align 8
+// OGCG-NEXT: store float 0x3FB99999A0000000, ptr %u, align 8
+// OGCG-NEXT: %2 = load float, ptr %u, align 8
+// OGCG-NEXT: store double 1.000000e-01, ptr %u, align 8
+// OGCG-NEXT: %3 = load double, ptr %u, align 8
+// OGCG-NEXT: ret void
\ No newline at end of file
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