diff options
| author | Tobias Burnus <tobias@codesourcery.com> | 2022-03-09 19:34:48 +0100 |
|---|---|---|
| committer | Tobias Burnus <tobias@codesourcery.com> | 2022-03-09 19:34:48 +0100 |
| commit | 450526551dcb97b7c0513699d4333efb79b8b490 (patch) | |
| tree | ad05b62098337397fc7e83b368938ee585961e46 /libgcc | |
| parent | bded0d549fdfdc1328b2c0189dc5f8593b4cbe42 (diff) | |
GCN: Implement __atomic_compare_exchange_{1,2} in libgcc [PR102215]
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}.
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/config/gcn/atomic.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/libgcc/config/gcn/atomic.c b/libgcc/config/gcn/atomic.c index 8784f90dfe2..cf29fa82aba 100644 --- a/libgcc/config/gcn/atomic.c +++ b/libgcc/config/gcn/atomic.c @@ -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) |