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| author | midipix <writeonce@midipix.org> | 2016-05-21 22:56:45 -0400 |
|---|---|---|
| committer | midipix <writeonce@midipix.org> | 2016-05-22 02:37:33 -0400 |
| commit | 381f65e77bcc81945e20829756a3da4a3d5c8624 (patch) | |
| tree | edff24777268f44f72b6448a28437c19035b5942 /include/ntapi/bits | |
| parent | 8aa2990a9b004e448e21f272e527222c83b3ee77 (diff) | |
| download | ntapi-381f65e77bcc81945e20829756a3da4a3d5c8624.tar.bz2 ntapi-381f65e77bcc81945e20829756a3da4a3d5c8624.tar.xz | |
nt_atomic.h: i386: implement at_locked_cas_64 as inline asm (distilled pain).
Diffstat (limited to 'include/ntapi/bits')
| -rw-r--r-- | include/ntapi/bits/i386/nt_atomic_i386_asm__gcc.h | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/include/ntapi/bits/i386/nt_atomic_i386_asm__gcc.h b/include/ntapi/bits/i386/nt_atomic_i386_asm__gcc.h index 23260e9..1e9ed71 100644 --- a/include/ntapi/bits/i386/nt_atomic_i386_asm__gcc.h +++ b/include/ntapi/bits/i386/nt_atomic_i386_asm__gcc.h @@ -251,15 +251,25 @@ static __inline__ int64_t at_locked_cas_64( int64_t cmp, int64_t xchg) { - __atomic_compare_exchange_n( - dst, - &cmp, - xchg, - 0, - __ATOMIC_SEQ_CST, - __ATOMIC_SEQ_CST); - - return cmp; + unsigned edx, eax; + unsigned ecx, ebx; + + eax = (unsigned)cmp; + edx = (uint64_t)cmp >> 32; + + ebx = (unsigned)xchg; + ecx = (uint64_t)xchg >> 32; + + __asm__ volatile ( + "lock;" + "cmpxchg8b %6" + + : "=a" (eax), "=d" (edx) + : "a" (eax), "d" (edx), "b" (ebx), "c" (ecx), "m" (*dst) + : "memory"); + + + return ((int64_t)edx << 32) + eax; } |