atomics-sema-alignment.c
981 Bytes
// RUN: %clang_cc1 -triple aarch64-linux-gnu %s -emit-llvm -o /dev/null -verify
typedef struct {
int a, b;
} IntPair;
typedef struct {
long long a;
} LongStruct;
typedef int __attribute__((aligned(1))) unaligned_int;
void func(IntPair *p) {
IntPair res;
__atomic_load(p, &res, 0); // expected-warning {{misaligned atomic operation may incur significant performance penalty}}
__atomic_store(p, &res, 0); // expected-warning {{misaligned atomic operation may incur significant performance penalty}}
__atomic_fetch_add((unaligned_int *)p, 1, 2); // expected-warning {{misaligned atomic operation may incur significant performance penalty}}
__atomic_fetch_sub((unaligned_int *)p, 1, 3); // expected-warning {{misaligned atomic operation may incur significant performance penalty}}
}
void func1(LongStruct *p) {
LongStruct res;
__atomic_load(p, &res, 0);
__atomic_store(p, &res, 0);
__atomic_fetch_add((int *)p, 1, 2);
__atomic_fetch_sub((int *)p, 1, 3);
}