diff options
| author | James Almer <jamrial@gmail.com> | 2014-10-27 22:48:08 -0300 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2014-10-29 14:09:58 -0300 |
| commit | faa9d2982969c999ab0e443a226eff116f7f8e4b (patch) | |
| tree | b0b06cfff37c8d773202dfde877201e0129cf3cd /configure | |
| parent | 931da6a5e9dd54563fe5d4d30b7bd4d0a0218c87 (diff) | |
| download | ffmpeg-faa9d2982969c999ab0e443a226eff116f7f8e4b.tar.gz | |
lavu/atomic: add support for the new memory model aware gcc built-ins
__sync built-ins are considered legacy and will be deprecated.
These new memory model aware built-ins have been available since GCC 4.7.0
Use them by default when available except for __atomic_compare_exchange_n(),
which is slower, and is instead implemented as a fallback for when and if gcc
removes the legacy __sync built-ins.
Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -1602,6 +1602,7 @@ ARCH_FEATURES=" BUILTIN_LIST=" atomic_cas_ptr + atomic_compare_exchange machine_rw_barrier MemoryBarrier mm_empty @@ -2028,7 +2029,7 @@ simd_align_16_if_any="altivec neon sse" symver_if_any="symver_asm_label symver_gnu_asm" # threading support -atomics_gcc_if="sync_val_compare_and_swap" +atomics_gcc_if_any="sync_val_compare_and_swap atomic_compare_exchange" atomics_suncc_if="atomic_cas_ptr machine_rw_barrier" atomics_win32_if="MemoryBarrier" atomics_native_if_any="$ATOMICS_LIST" @@ -4681,6 +4682,7 @@ if ! disabled network; then fi check_builtin atomic_cas_ptr atomic.h "void **ptr; void *oldval, *newval; atomic_cas_ptr(ptr, oldval, newval)" +check_builtin atomic_compare_exchange "" "int *ptr, *oldval; int newval; __atomic_compare_exchange_n(ptr, oldval, newval, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)" check_builtin machine_rw_barrier mbarrier.h "__machine_rw_barrier()" check_builtin MemoryBarrier windows.h "MemoryBarrier()" check_builtin sarestart signal.h "SA_RESTART" |