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GCN: Implement __atomic_compare_exchange_{1,2} in libgcc [PR102215]

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libgcc/ChangeLog:

	PR target/102215
	* config/gcn/atomic.c (__sync_val_compare_and_swap_##SIZE): Move
	a line up to non-arg-dependent value first.
	(__ATOMIC_COMPARE_EXCHANGE): Define + call to generate
	__atomic_compare_exchange_{1,2}.
This commit is contained in:
Tobias Burnus 2022-03-09 19:34:48 +01:00
parent bded0d549f
commit 450526551d
1 changed files with 28 additions and 1 deletions
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29
libgcc/config/gcn/atomic.c
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@ -28,9 +28,9 @@
TYPE \
__sync_val_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
{ \
unsigned int valmask = (1 << (SIZE * 8)) - 1; \
unsigned int *wordptr = (unsigned int *)((__UINTPTR_TYPE__ ) ptr & ~3UL); \
int shift = ((__UINTPTR_TYPE__ ) ptr & 3UL) * 8; \
unsigned int valmask = (1 << (SIZE * 8)) - 1; \
unsigned int wordmask = ~(valmask << shift); \
unsigned int oldword = *wordptr; \
for (;;) \
@ -57,3 +57,30 @@ __sync_bool_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned char, 1)
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned short, 2)
#define __ATOMIC_COMPARE_EXCHANGE(TYPE,SIZE) \
bool \
__atomic_compare_exchange_##SIZE (TYPE *ptr, TYPE *expected, \
TYPE desired, bool weak, \
int success_memorder, int failure_memorder) \
{ \
unsigned int valmask = (1 << (SIZE * 8)) - 1; \
\
unsigned int *wordptr = (unsigned int *)((__UINTPTR_TYPE__ ) ptr & ~3UL); \
int ptrshift = ((__UINTPTR_TYPE__ ) ptr & 3UL) * 8; \
unsigned int wordmask = ~(valmask << ptrshift); \
\
unsigned int ptrword = *wordptr; \
unsigned int exptword = ptrword & wordmask; \
unsigned int newword = ptrword & wordmask; \
exptword |= ((unsigned int) *expected) << ptrshift; \
newword |= ((unsigned int) desired) << ptrshift; \
if (__atomic_compare_exchange_4 (wordptr, &exptword, newword, weak, \
success_memorder, failure_memorder)) \
return true; \
*expected = (TYPE) ((exptword >> ptrshift) & valmask); \
return false; \
}
__ATOMIC_COMPARE_EXCHANGE (unsigned char, 1)
__ATOMIC_COMPARE_EXCHANGE (unsigned short, 2)