blob: 56b89a5a0b038e52f88c6457daf7277f083a9abc [file] [log] [blame]
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// bool Cas(uint32 *ptr, uint32 old, uint32 new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
TEXT runtime∕internal∕atomic·Cas(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R0
MOVW old+8(FP), R1
MOVW new+12(FP), R2
again:
LDAXRW (R0), R3
CMPW R1, R3
BNE ok
STLXRW R2, (R0), R3
CBNZ R3, again
ok:
CSET EQ, R0
MOVB R0, ret+16(FP)
RET
TEXT runtime∕internal∕atomic·Casuintptr(SB), NOSPLIT, $0-25
B runtime∕internal∕atomic·Cas64(SB)
TEXT runtime∕internal∕atomic·Loaduintptr(SB), NOSPLIT, $0-16
B runtime∕internal∕atomic·Load64(SB)
TEXT runtime∕internal∕atomic·Loaduint(SB), NOSPLIT, $0-16
B runtime∕internal∕atomic·Load64(SB)
TEXT runtime∕internal∕atomic·Storeuintptr(SB), NOSPLIT, $0-16
B runtime∕internal∕atomic·Store64(SB)
TEXT runtime∕internal∕atomic·Xadduintptr(SB), NOSPLIT, $0-24
B runtime∕internal∕atomic·Xadd64(SB)
TEXT runtime∕internal∕atomic·Loadint64(SB), NOSPLIT, $0-16
B runtime∕internal∕atomic·Load64(SB)
TEXT runtime∕internal∕atomic·Xaddint64(SB), NOSPLIT, $0-24
B runtime∕internal∕atomic·Xadd64(SB)
// bool Casp1(void **val, void *old, void *new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
TEXT runtime∕internal∕atomic·Casp1(SB), NOSPLIT, $0-25
B runtime∕internal∕atomic·Cas64(SB)