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| author | Julian Zhu <jz531210@gmail.com> | 2024-11-26 17:14:45 +0800 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2025-02-20 09:44:53 -0800 |
| commit | 266b0cff187f7deac294e5731143f0d0ffe04948 (patch) | |
| tree | 45d293c8389fb903cc686f78e8f3b4eb38c14b8b /src/internal/runtime/atomic | |
| parent | 00635de759b38610dd86f60074856367d6a1ceaa (diff) | |
| download | go-266b0cff187f7deac294e5731143f0d0ffe04948.tar.xz | |
internal/runtime/atomic: add Xchg8 for mips64x
For #69735
Change-Id: Ide6b3077768a96b76078e5d4f6460596b8ff1560
Reviewed-on: https://go-review.googlesource.com/c/go/+/631756
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/internal/runtime/atomic')
| -rw-r--r-- | src/internal/runtime/atomic/atomic_mips64x.go | 3 | ||||
| -rw-r--r-- | src/internal/runtime/atomic/atomic_mips64x.s | 33 | ||||
| -rw-r--r-- | src/internal/runtime/atomic/xchg8_test.go | 2 |
3 files changed, 37 insertions, 1 deletions
diff --git a/src/internal/runtime/atomic/atomic_mips64x.go b/src/internal/runtime/atomic/atomic_mips64x.go index f434c939e3..4c0148f8a7 100644 --- a/src/internal/runtime/atomic/atomic_mips64x.go +++ b/src/internal/runtime/atomic/atomic_mips64x.go @@ -21,6 +21,9 @@ func Xadduintptr(ptr *uintptr, delta uintptr) uintptr func Xchg(ptr *uint32, new uint32) uint32 //go:noescape +func Xchg8(ptr *uint8, new uint8) uint8 + +//go:noescape func Xchg64(ptr *uint64, new uint64) uint64 //go:noescape diff --git a/src/internal/runtime/atomic/atomic_mips64x.s b/src/internal/runtime/atomic/atomic_mips64x.s index 7b0e080238..ce0b5c2f73 100644 --- a/src/internal/runtime/atomic/atomic_mips64x.s +++ b/src/internal/runtime/atomic/atomic_mips64x.s @@ -147,6 +147,39 @@ TEXT ·Xadd64(SB), NOSPLIT, $0-24 SYNC RET +// uint8 Xchg(ptr *uint8, new uint8) +// Atomically: +// old := *ptr; +// *ptr = new; +// return old; +TEXT ·Xchg8(SB), NOSPLIT, $0-17 + MOVV ptr+0(FP), R2 + MOVBU new+8(FP), R5 +#ifdef GOARCH_mips64 + // Big endian. ptr = ptr ^ 3 + XOR $3, R2 +#endif + // R4 = ((ptr & 3) * 8) + AND $3, R2, R4 + SLLV $3, R4 + // Shift val for aligned ptr. R7 = (0xFF << R4) ^ (-1) + MOVV $0xFF, R7 + SLLV R4, R7 + XOR $-1, R7 + AND $~3, R2 + SLLV R4, R5 + + SYNC + LL (R2), R9 + AND R7, R9, R8 + OR R5, R8 + SC R8, (R2) + BEQ R8, -5(PC) + SYNC + SRLV R4, R9 + MOVBU R9, ret+16(FP) + RET + // uint32 Xchg(ptr *uint32, new uint32) // Atomically: // old := *ptr; diff --git a/src/internal/runtime/atomic/xchg8_test.go b/src/internal/runtime/atomic/xchg8_test.go index 8d30212adc..d62f3dc73a 100644 --- a/src/internal/runtime/atomic/xchg8_test.go +++ b/src/internal/runtime/atomic/xchg8_test.go @@ -2,7 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -//go:build 386 || amd64 || arm || arm64 || loong64 || ppc64 || ppc64le || riscv64 +//go:build 386 || amd64 || arm || arm64 || loong64 || mips64 || mips64le || ppc64 || ppc64le || riscv64 package atomic_test |