generic-library/bionic
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

am d2124b7c: am 7e997388: am b5e21103: Merge "AArch64: Use LDXR/STXR instead of LDAXR/STLXR for bionic_atomic_cmpxchg()"

Browse Source 
* commit 'd2124b7c5ca15cb593c824d2488f6a95dce4a519':
  AArch64: Use LDXR/STXR instead of LDAXR/STLXR for bionic_atomic_cmpxchg()
This commit is contained in:
Elliott Hughes 2014-01-14 01:15:04 +00:00 committed by Android Git Automerger
commit 41af7f39e9
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libc/private/bionic_atomic_aarch64.h
View File

@ -29,15 +29,15 @@ __ATOMIC_INLINE__ int __bionic_cmpxchg(int32_t old_value, int32_t new_value, vol
int32_t tmp, oldval; int32_t tmp, oldval;
__asm__ __volatile__ ( __asm__ __volatile__ (
"// atomic_cmpxchg\n" "// atomic_cmpxchg\n"
"1: ldaxr %w1, [%3]\n" "1: ldxr %w1, [%3]\n"
" cmp %w1, %w4\n" " cmp %w1, %w4\n"
" b.ne 2f\n" " b.ne 2f\n"
" stlxr %w0, %w5, [%3]\n" " stxr %w0, %w5, [%3]\n"
" cbnz %w0, 1b\n" " cbnz %w0, 1b\n"
"2:" "2:"
: "=&r" (tmp), "=&r" (oldval), "+o"(*ptr) : "=&r" (tmp), "=&r" (oldval), "+o"(*ptr)
: "r" (ptr), "Ir" (old_value), "r" (new_value) : "r" (ptr), "Ir" (old_value), "r" (new_value)
: "cc"); : "cc", "memory");
return oldval != old_value; return oldval != old_value;
} }
@ -51,7 +51,7 @@ __ATOMIC_INLINE__ int32_t __bionic_swap(int32_t new_value, volatile int32_t* ptr
" cbnz %w1, 1b\n" " cbnz %w1, 1b\n"
: "=&r" (prev), "=&r" (status), "+o" (*ptr) : "=&r" (prev), "=&r" (status), "+o" (*ptr)
: "r" (ptr), "r" (new_value) : "r" (ptr), "r" (new_value)
: "cc"); : "cc", "memory");
return prev; return prev;
} }
@ -65,7 +65,7 @@ __ATOMIC_INLINE__ int32_t __bionic_atomic_dec(volatile int32_t* ptr) {
" cbnz %w2, 1b" " cbnz %w2, 1b"
: "=&r" (prev), "=&r" (tmp), "=&r" (status), "+m"(*ptr) : "=&r" (prev), "=&r" (tmp), "=&r" (status), "+m"(*ptr)
: "r" (ptr) : "r" (ptr)
: "cc"); : "cc", "memory");
return prev; return prev;
} }