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llvm-tms34010/clang/test/CodeGen/linux-kernel-struct-union-initializer2.c
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Nikita Popov 5ef4320eed [IR] Remove volatile from nosync (#194391) 
Volatile operations are explicitly specified as not synchronizing...

> This is not Java’s “volatile” and has no cross-thread synchronization
behavior.

... and LLVM does not model them as being synchronizing anywhere, except
the definition of this attribute, which is largely unused outside the
Attributor.

The ordering requirements of volatile operations are already fully
encoded in their memory effects (unlike what is the case for
stronger-than-monotonic atomics).

Clarify that "nosync" is specifically in the sense of
"synchronizes-with" (rather than just any cross-thread communication)
and remove volatile operations from the definition.
2026-05-04 09:53:24 +02:00

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// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --check-globals all --version 5
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=gnu11 -verify -emit-llvm %s -o - | FileCheck %s
// expected-no-diagnostics
union U1 {
int x;
char y[5];
};
struct S1 {
int x;
long long y;
};
struct S2 {
unsigned char b1 : 3; // 1st 3 bits (in 1st byte) are b1
unsigned char : 2; // next 2 bits (in 1st byte) are blocked out as unused
unsigned char b2 : 6; // 6 bits for b2 - doesn't fit into the 1st byte => starts a 2nd
unsigned char b3 : 2; // 2 bits for b3 - next (and final) bits in the 2nd byte
int i;
};
struct S3 {
int x;
} __attribute__((__aligned__(8)));
struct S4 {
int a;
union U1 b;
};
struct S5 {
char x;
unsigned char y : 4;
unsigned char z : 7;
} __attribute__((packed));
// Test non-const initializer for union with padding.
// CHECK-LABEL: define dso_local void @test1(
// CHECK-SAME: i32 noundef [[X:%.*]]) #[[ATTR0:[0-9]+]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[X_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT: [[A:%.*]] = alloca [[UNION_U1:%.*]], align 4
// CHECK-NEXT: store i32 [[X]], ptr [[X_ADDR]], align 4
// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[X_ADDR]], align 4
// CHECK-NEXT: store i32 [[TMP0]], ptr [[A]], align 4
// CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[A]], i64 4
// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[TMP1]], i8 0, i64 4, i1 false)
// CHECK-NEXT: ret void
//
void test1(int x) {
union U1 a = {x};
}
// Test non-const initializer for struct with padding.
// CHECK-LABEL: define dso_local void @test2(
// CHECK-SAME: i64 noundef [[Y:%.*]]) #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[Y_ADDR:%.*]] = alloca i64, align 8
// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S1:%.*]], align 8
// CHECK-NEXT: store i64 [[Y]], ptr [[Y_ADDR]], align 8
// CHECK-NEXT: [[X:%.*]] = getelementptr inbounds nuw [[STRUCT_S1]], ptr [[S]], i32 0, i32 0
// CHECK-NEXT: store i32 0, ptr [[X]], align 8
// CHECK-NEXT: [[TMP0:%.*]] = getelementptr i8, ptr [[S]], i64 4
// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[TMP0]], i8 0, i64 4, i1 false)
// CHECK-NEXT: [[Y1:%.*]] = getelementptr inbounds nuw [[STRUCT_S1]], ptr [[S]], i32 0, i32 1
// CHECK-NEXT: [[TMP1:%.*]] = load i64, ptr [[Y_ADDR]], align 8
// CHECK-NEXT: store i64 [[TMP1]], ptr [[Y1]], align 8
// CHECK-NEXT: ret void
//
void test2(long long y) {
struct S1 s = {.y = y};
}
// Test non-const initializer for struct with padding and bit fields.
// CHECK-LABEL: define dso_local void @test3(
// CHECK-SAME: i8 noundef zeroext [[B:%.*]]) #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[B_ADDR:%.*]] = alloca i8, align 1
// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S2:%.*]], align 4
// CHECK-NEXT: store i8 [[B]], ptr [[B_ADDR]], align 1
// CHECK-NEXT: store i16 0, ptr [[S]], align 4
// CHECK-NEXT: [[TMP0:%.*]] = load i8, ptr [[B_ADDR]], align 1
// CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[TMP0]] to i16
// CHECK-NEXT: [[BF_LOAD:%.*]] = load i16, ptr [[S]], align 4
// CHECK-NEXT: [[BF_VALUE:%.*]] = and i16 [[TMP1]], 7
// CHECK-NEXT: [[BF_CLEAR:%.*]] = and i16 [[BF_LOAD]], -8
// CHECK-NEXT: [[BF_SET:%.*]] = or i16 [[BF_CLEAR]], [[BF_VALUE]]
// CHECK-NEXT: store i16 [[BF_SET]], ptr [[S]], align 4
// CHECK-NEXT: [[BF_LOAD1:%.*]] = load i16, ptr [[S]], align 4
// CHECK-NEXT: [[BF_CLEAR2:%.*]] = and i16 [[BF_LOAD1]], -16129
// CHECK-NEXT: [[BF_SET3:%.*]] = or i16 [[BF_CLEAR2]], 0
// CHECK-NEXT: store i16 [[BF_SET3]], ptr [[S]], align 4
// CHECK-NEXT: [[BF_LOAD4:%.*]] = load i16, ptr [[S]], align 4
// CHECK-NEXT: [[BF_CLEAR5:%.*]] = and i16 [[BF_LOAD4]], 16383
// CHECK-NEXT: [[BF_SET6:%.*]] = or i16 [[BF_CLEAR5]], 0
// CHECK-NEXT: store i16 [[BF_SET6]], ptr [[S]], align 4
// CHECK-NEXT: [[TMP2:%.*]] = getelementptr i8, ptr [[S]], i64 2
// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 2 [[TMP2]], i8 0, i64 2, i1 false)
// CHECK-NEXT: [[I:%.*]] = getelementptr inbounds nuw [[STRUCT_S2]], ptr [[S]], i32 0, i32 1
// CHECK-NEXT: store i32 0, ptr [[I]], align 4
// CHECK-NEXT: ret void
//
void test3(unsigned char b) {
struct S2 s = {.b1 = b};
}
// Test non-const initializer for struct with padding at the end of the struct.
// CHECK-LABEL: define dso_local void @test4(
// CHECK-SAME: i32 noundef [[X:%.*]]) #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[X_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S3:%.*]], align 8
// CHECK-NEXT: store i32 [[X]], ptr [[X_ADDR]], align 4
// CHECK-NEXT: [[X1:%.*]] = getelementptr inbounds nuw [[STRUCT_S3]], ptr [[S]], i32 0, i32 0
// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[X_ADDR]], align 4
// CHECK-NEXT: store i32 [[TMP0]], ptr [[X1]], align 8
// CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[S]], i64 4
// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[TMP1]], i8 0, i64 4, i1 false)
// CHECK-NEXT: ret void
//
void test4(int x) {
struct S3 s = {x};
}
// Test non-const initializer for union in struct.
// CHECK-LABEL: define dso_local void @test5(
// CHECK-SAME: i32 noundef [[A:%.*]], i32 noundef [[B:%.*]]) #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[A_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT: [[B_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S4:%.*]], align 4
// CHECK-NEXT: store i32 [[A]], ptr [[A_ADDR]], align 4
// CHECK-NEXT: store i32 [[B]], ptr [[B_ADDR]], align 4
// CHECK-NEXT: [[A1:%.*]] = getelementptr inbounds nuw [[STRUCT_S4]], ptr [[S]], i32 0, i32 0
// CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[A_ADDR]], align 4
// CHECK-NEXT: store i32 [[TMP0]], ptr [[A1]], align 4
// CHECK-NEXT: [[B2:%.*]] = getelementptr inbounds nuw [[STRUCT_S4]], ptr [[S]], i32 0, i32 1
// CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[B_ADDR]], align 4
// CHECK-NEXT: store i32 [[TMP1]], ptr [[B2]], align 4
// CHECK-NEXT: [[TMP2:%.*]] = getelementptr i8, ptr [[B2]], i64 4
// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[TMP2]], i8 0, i64 4, i1 false)
// CHECK-NEXT: ret void
//
void test5(int a, int b) {
struct S4 s = {a, {b}};
}
// CHECK-LABEL: define dso_local void @test6(
// CHECK-SAME: i8 noundef signext [[X:%.*]]) #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[X_ADDR:%.*]] = alloca i8, align 1
// CHECK-NEXT: [[S:%.*]] = alloca [[STRUCT_S5:%.*]], align 1
// CHECK-NEXT: store i8 [[X]], ptr [[X_ADDR]], align 1
// CHECK-NEXT: [[X1:%.*]] = getelementptr inbounds nuw [[STRUCT_S5]], ptr [[S]], i32 0, i32 0
// CHECK-NEXT: [[TMP0:%.*]] = load i8, ptr [[X_ADDR]], align 1
// CHECK-NEXT: store i8 [[TMP0]], ptr [[X1]], align 1
// CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr [[S]], i64 1
// CHECK-NEXT: store i16 0, ptr [[TMP1]], align 1
// CHECK-NEXT: [[Y:%.*]] = getelementptr inbounds nuw [[STRUCT_S5]], ptr [[S]], i32 0, i32 1
// CHECK-NEXT: [[BF_LOAD:%.*]] = load i16, ptr [[Y]], align 1
// CHECK-NEXT: [[BF_CLEAR:%.*]] = and i16 [[BF_LOAD]], -16
// CHECK-NEXT: [[BF_SET:%.*]] = or i16 [[BF_CLEAR]], 0
// CHECK-NEXT: store i16 [[BF_SET]], ptr [[Y]], align 1
// CHECK-NEXT: [[Z:%.*]] = getelementptr inbounds nuw [[STRUCT_S5]], ptr [[S]], i32 0, i32 1
// CHECK-NEXT: [[BF_LOAD2:%.*]] = load i16, ptr [[Z]], align 1
// CHECK-NEXT: [[BF_CLEAR3:%.*]] = and i16 [[BF_LOAD2]], -2033
// CHECK-NEXT: [[BF_SET4:%.*]] = or i16 [[BF_CLEAR3]], 0
// CHECK-NEXT: store i16 [[BF_SET4]], ptr [[Z]], align 1
// CHECK-NEXT: ret void
//
void test6(char x) {
struct S5 s = {.x = x};
}
//.
// CHECK: attributes #[[ATTR0]] = { noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-features"="+cx8,+mmx,+sse,+sse2,+x87" }
// CHECK: attributes #[[ATTR1:[0-9]+]] = { nocallback nofree nosync nounwind willreturn memory(argmem: write) }
//.
// CHECK: [[META0:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
//.
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