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internal/runtime/atomic: updated go assembler comments

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Updated comments in go assembler package

Change-Id: I174e344ca45fae6ef70af2e0b29cd783b003b4c2
GitHub-Last-Rev: 8ab3720889
GitHub-Pull-Request: golang/go#72048
Reviewed-on: https://go-review.googlesource.com/c/go/+/654478
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: PRABHAV DOGRA <prabhavdogra1@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Prabhav Dogra 2025-03-07 09:32:20 +00:00 • committed by Gopher Robot
parent 895bcf178d
commit 04164e5f5a
10 changed files with 136 additions and 122 deletions
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36
src/internal/runtime/atomic/atomic_386.s
View file

@ -5,13 +5,14 @@
#include "textflag.h"
#include "funcdata.h"
// bool Cas(int32 *val, int32 old, int32 new)
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// }else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-13
MOVL ptr+0(FP), BX
MOVL old+4(FP), AX
@ -63,13 +64,13 @@ TEXT ·Xaddint32(SB), NOSPLIT, $0-12
TEXT ·Xaddint64(SB), NOSPLIT, $0-20
JMP ·Xadd64(SB)
// bool ·Cas64(uint64 *val, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return 0;
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-21
NO_LOCAL_POINTERS
@ -86,13 +87,14 @@ TEXT ·Cas64(SB), NOSPLIT, $0-21
SETEQ ret+20(FP)
RET
// bool Casp1(void **p, void *old, void *new)
// func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if(*p == old){
// *p = new;
// return 1;
// }else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Casp1(SB), NOSPLIT, $0-13
MOVL ptr+0(FP), BX
MOVL old+4(FP), AX

36
src/internal/runtime/atomic/atomic_amd64.s
View file

@ -19,13 +19,14 @@ TEXT ·Loadint32(SB), NOSPLIT, $0-12
TEXT ·Loadint64(SB), NOSPLIT, $0-16
JMP ·Load64(SB)
// bool Cas(int32 *val, int32 old, int32 new)
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB),NOSPLIT,$0-17
MOVQ ptr+0(FP), BX
MOVL old+8(FP), AX
@ -35,13 +36,13 @@ TEXT ·Cas(SB),NOSPLIT,$0-17
SETEQ ret+16(FP)
RET
// bool ·Cas64(uint64 *val, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return 0;
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-25
MOVQ ptr+0(FP), BX
@ -52,13 +53,14 @@ TEXT ·Cas64(SB), NOSPLIT, $0-25
SETEQ ret+24(FP)
RET
// bool Casp1(void **val, void *old, void *new)
// func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Casp1(SB), NOSPLIT, $0-25
MOVQ ptr+0(FP), BX
MOVQ old+8(FP), AX

13
src/internal/runtime/atomic/atomic_arm.s
View file

@ -6,13 +6,14 @@
#include "textflag.h"
#include "funcdata.h"
// bool armcas(int32 *val, int32 old, int32 new)
// func armcas(ptr *int32, old, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// }else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
//
// To implement ·cas in sys_$GOOS_arm.s
// using the native instructions, use:

27
src/internal/runtime/atomic/atomic_arm64.s
View file

@ -192,13 +192,14 @@ load_store_loop:
RET
#endif
// bool Cas(uint32 *ptr, uint32 old, uint32 new)
// func Cas(ptr *uint32, old, new uint32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R0
MOVW old+8(FP), R1
@ -226,14 +227,14 @@ ok:
RET
#endif
// bool ·Cas64(uint64 *ptr, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else {
// return 0;
// }
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-25
MOVD ptr+0(FP), R0
MOVD old+8(FP), R1

36
src/internal/runtime/atomic/atomic_loong64.s
View file

@ -5,13 +5,14 @@
#include "go_asm.h"
#include "textflag.h"
// bool cas(uint32 *ptr, uint32 old, uint32 new)
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if(*ptr == old){
// *ptr = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-17
MOVV ptr+0(FP), R4
MOVW old+8(FP), R5
@ -45,13 +46,13 @@ cas_fail1:
MOVV $0, R4
JMP -4(PC)
// bool cas64(uint64 *ptr, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*ptr == old){
// *ptr = new;
// return 1;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return 0;
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-25
MOVV ptr+0(FP), R4
@ -119,13 +120,14 @@ TEXT ·Xaddint32(SB),NOSPLIT,$0-20
TEXT ·Xaddint64(SB), NOSPLIT, $0-24
JMP ·Xadd64(SB)
// bool casp(void **val, void *old, void *new)
// func Casp(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Casp1(SB), NOSPLIT, $0-25
JMP ·Cas64(SB)

36
src/internal/runtime/atomic/atomic_mips64x.s
View file

@ -8,13 +8,14 @@
#define SYNC WORD $0xf
// bool cas(uint32 *ptr, uint32 old, uint32 new)
// func cas(ptr *uint32, old, new uint32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-17
MOVV ptr+0(FP), R1
MOVW old+8(FP), R2
@ -34,13 +35,13 @@ cas_fail:
MOVV $0, R1
JMP -4(PC)
// bool cas64(uint64 *ptr, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return 0;
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-25
MOVV ptr+0(FP), R1
@ -103,13 +104,14 @@ TEXT ·Xaddint32(SB), NOSPLIT, $0-20
TEXT ·Xaddint64(SB), NOSPLIT, $0-24
JMP ·Xadd64(SB)
// bool casp(void **val, void *old, void *new)
// func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Casp1(SB), NOSPLIT, $0-25
JMP ·Cas64(SB)

13
src/internal/runtime/atomic/atomic_mipsx.s
View file

@ -6,13 +6,14 @@
#include "textflag.h"
// bool Cas(int32 *val, int32 old, int32 new)
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB),NOSPLIT,$0-13
MOVW ptr+0(FP), R1
MOVW old+4(FP), R2

36
src/internal/runtime/atomic/atomic_ppc64x.s
View file

@ -78,13 +78,14 @@ TEXT ·LoadAcq64(SB),NOSPLIT|NOFRAME,$-8-16
MOVD R3, ret+8(FP)
RET
// bool cas(uint32 *ptr, uint32 old, uint32 new)
// func Cas(ptr *int32, old, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-17
MOVD ptr+0(FP), R3
MOVWZ old+8(FP), R4
@ -105,13 +106,13 @@ cas_fail:
MOVB R0, ret+16(FP)
RET
// bool ·Cas64(uint64 *ptr, uint64 old, uint64 new)
// func Cas64(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return 0;
// return false
// }
TEXT ·Cas64(SB), NOSPLIT, $0-25
MOVD ptr+0(FP), R3
@ -196,13 +197,14 @@ TEXT ·Xaddint32(SB), NOSPLIT, $0-20
TEXT ·Xaddint64(SB), NOSPLIT, $0-24
BR ·Xadd64(SB)
// bool casp(void **val, void *old, void *new)
// func Casp1(ptr *unsafe.Pointer, old, new unsafe.Pointer) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Casp1(SB), NOSPLIT, $0-25
BR ·Cas64(SB)

12
src/internal/runtime/atomic/atomic_riscv64.s
View file

@ -32,12 +32,12 @@
// func Cas(ptr *uint64, old, new uint64) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// } else {
// return 0;
// }
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB), NOSPLIT, $0-17
MOV ptr+0(FP), A0
MOVW old+8(FP), A1

13
src/internal/runtime/atomic/sys_nonlinux_arm.s
View file

@ -7,13 +7,14 @@
#include "textflag.h"
// TODO(minux): this is only valid for ARMv6+
// bool armcas(int32 *val, int32 old, int32 new)
// func armcas(ptr *int32, old int32, new int32) bool
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// }else
// return 0;
// if *ptr == old {
// *ptr = new
// return true
// } else {
// return false
// }
TEXT ·Cas(SB),NOSPLIT,$0
JMP ·armcas(SB)