From faa9d2982969c999ab0e443a226eff116f7f8e4b Mon Sep 17 00:00:00 2001 From: James Almer Date: Mon, 27 Oct 2014 22:48:08 -0300 Subject: 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 Signed-off-by: James Almer --- configure | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'configure') diff --git a/configure b/configure index 0a1b154f69..1913cb53c8 100755 --- a/configure +++ b/configure @@ -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" -- cgit v1.2.3