ref: 78808ca314949f40d9f6aa7abd4aa0e3f6e4b88d
dir: /sys/src/libc/amd64/atom.s/
TEXT ainc(SB), 1, $0 /* int ainc(int *); */ ainclp: MOVL (RARG), AX /* exp */ MOVL AX, BX INCL BX /* new */ LOCK; CMPXCHGL BX, (RARG) JNZ ainclp MOVL BX, AX RET TEXT adec(SB), 1, $0 /* int adec(int*); */ adeclp: MOVL (RARG), AX MOVL AX, BX DECL BX LOCK; CMPXCHGL BX, (RARG) JNZ adeclp MOVL BX, AX RET /* * int cas32(u32int *p, u32int ov, u32int nv); * int cas(uint *p, int ov, int nv); * int casl(ulong *p, ulong ov, ulong nv); */ TEXT cas32(SB), 1, $0 TEXT cas(SB), 1, $0 TEXT casul(SB), 1, $0 TEXT casl(SB), 1, $0 /* back compat */ MOVL exp+8(FP), AX MOVL new+16(FP), BX LOCK; CMPXCHGL BX, (RARG) MOVL $1, AX /* use CMOVLEQ etc. here? */ JNZ _cas32r0 _cas32r1: RET _cas32r0: DECL AX RET /* * int cas64(u64int *p, u64int ov, u64int nv); * int casp(void **p, void *ov, void *nv); */ TEXT cas64(SB), 1, $0 TEXT casp(SB), 1, $0 MOVQ exp+8(FP), AX MOVQ new+16(FP), BX LOCK; CMPXCHGQ BX, (RARG) MOVL $1, AX /* use CMOVLEQ etc. here? */ JNZ _cas64r0 _cas64r1: RET _cas64r0: DECL AX RET TEXT fas64(SB), 1, $-4 TEXT fasp(SB), 1, $-4 MOVQ p+8(FP), AX LOCK; XCHGQ AX, (RARG) /* */ RET TEXT fas32(SB), 1, $-4 MOVL p+8(FP), AX LOCK; XCHGL AX, (RARG) /* */ RET