| // Copyright 2014 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. |
| |
| // +build ppc64 ppc64le |
| |
| #include "textflag.h" |
| |
| |
| // For more details about how various memory models are |
| // enforced on POWER, the following paper provides more |
| // details about how they enforce C/C++ like models. This |
| // gives context about why the strange looking code |
| // sequences below work. |
| // |
| // http://www.rdrop.com/users/paulmck/scalability/paper/N2745r.2011.03.04a.html |
| |
| // uint32 runtime∕internal∕atomic·Load(uint32 volatile* ptr) |
| TEXT ·Load(SB),NOSPLIT|NOFRAME,$-8-12 |
| MOVD ptr+0(FP), R3 |
| SYNC |
| MOVWZ 0(R3), R3 |
| CMPW R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7,0x4 |
| ISYNC |
| MOVW R3, ret+8(FP) |
| RET |
| |
| // uint8 runtime∕internal∕atomic·Load8(uint8 volatile* ptr) |
| TEXT ·Load8(SB),NOSPLIT|NOFRAME,$-8-9 |
| MOVD ptr+0(FP), R3 |
| SYNC |
| MOVBZ 0(R3), R3 |
| CMP R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7,0x4 |
| ISYNC |
| MOVB R3, ret+8(FP) |
| RET |
| |
| // uint64 runtime∕internal∕atomic·Load64(uint64 volatile* ptr) |
| TEXT ·Load64(SB),NOSPLIT|NOFRAME,$-8-16 |
| MOVD ptr+0(FP), R3 |
| SYNC |
| MOVD 0(R3), R3 |
| CMP R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7,0x4 |
| ISYNC |
| MOVD R3, ret+8(FP) |
| RET |
| |
| // void *runtime∕internal∕atomic·Loadp(void *volatile *ptr) |
| TEXT ·Loadp(SB),NOSPLIT|NOFRAME,$-8-16 |
| MOVD ptr+0(FP), R3 |
| SYNC |
| MOVD 0(R3), R3 |
| CMP R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7,0x4 |
| ISYNC |
| MOVD R3, ret+8(FP) |
| RET |
| |
| // uint32 runtime∕internal∕atomic·LoadAcq(uint32 volatile* ptr) |
| TEXT ·LoadAcq(SB),NOSPLIT|NOFRAME,$-8-12 |
| MOVD ptr+0(FP), R3 |
| MOVWZ 0(R3), R3 |
| CMPW R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7, 0x4 |
| ISYNC |
| MOVW R3, ret+8(FP) |
| RET |
| |
| // uint64 runtime∕internal∕atomic·LoadAcq64(uint64 volatile* ptr) |
| TEXT ·LoadAcq64(SB),NOSPLIT|NOFRAME,$-8-16 |
| MOVD ptr+0(FP), R3 |
| MOVD 0(R3), R3 |
| CMP R3, R3, CR7 |
| BC 4, 30, 1(PC) // bne- cr7, 0x4 |
| ISYNC |
| MOVD R3, ret+8(FP) |
| RET |
