49 lines · c
1// RUN: %clang_cc1 -triple aarch64-linux-gnu %s -emit-llvm -o /dev/null -verify2 3typedef struct {4 int a, b;5} IntPair;6 7typedef struct {8 long long a;9} LongStruct;10 11typedef int __attribute__((aligned(1))) unaligned_int;12 13void func(IntPair *p) {14 IntPair res;15 __atomic_load(p, &res, 0); // expected-warning {{misaligned atomic operation may incur significant performance penalty; the expected alignment (8 bytes) exceeds the actual alignment (4 bytes)}}16 __atomic_store(p, &res, 0); // expected-warning {{misaligned atomic operation may incur significant performance penalty; the expected alignment (8 bytes) exceeds the actual alignment (4 bytes)}}17 __atomic_fetch_add((unaligned_int *)p, 1, 2); // expected-warning {{misaligned atomic operation may incur significant performance penalty; the expected alignment (4 bytes) exceeds the actual alignment (1 bytes)}}18 __atomic_fetch_sub((unaligned_int *)p, 1, 3); // expected-warning {{misaligned atomic operation may incur significant performance penalty; the expected alignment (4 bytes) exceeds the actual alignment (1 bytes)}}19}20 21void func1(LongStruct *p) {22 LongStruct res;23 __atomic_load(p, &res, 0);24 __atomic_store(p, &res, 0);25 __atomic_fetch_add((int *)p, 1, 2);26 __atomic_fetch_sub((int *)p, 1, 3);27}28 29typedef struct {30 void *a;31 void *b;32} Foo;33 34typedef struct {35 void *a;36 void *b;37 void *c;38 void *d;39} __attribute__((aligned(32))) ThirtyTwo;40 41void braz(Foo *foo, ThirtyTwo *braz) {42 Foo bar;43 __atomic_load(foo, &bar, __ATOMIC_RELAXED); // expected-warning {{misaligned atomic operation may incur significant performance penalty; the expected alignment (16 bytes) exceeds the actual alignment (8 bytes)}}44 45 ThirtyTwo thirtyTwo1;46 ThirtyTwo thirtyTwo2;47 __atomic_load(&thirtyTwo1, &thirtyTwo2, __ATOMIC_RELAXED); // expected-warning {{large atomic operation may incur significant performance penalty; the access size (32 bytes) exceeds the max lock-free size (16 bytes)}}48}49