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internal/runtime/atomic: add Xchg8 for 386
For #69735
Change-Id: I5b9f57315d693d613dc88dc02c10bee39aeeef76
GitHub-Last-Rev: 690337e5b8
GitHub-Pull-Request: golang/go#69923
Reviewed-on: https://go-review.googlesource.com/c/go/+/620756
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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@ -53,6 +53,9 @@ func Xchg64(ptr *uint64, new uint64) uint64
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//go:noescape
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func Xchg(ptr *uint32, new uint32) uint32
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//go:noescape
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func Xchg8(ptr *uint8, new uint8) uint8
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//go:noescape
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func Xchguintptr(ptr *uintptr, new uintptr) uintptr
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@ -153,6 +153,14 @@ addloop:
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MOVL CX, ret_hi+16(FP)
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RET
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// uint8 Xchg8(uint8 *ptr, uint8 new)
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TEXT ·Xchg8(SB), NOSPLIT, $0-9
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MOVL ptr+0(FP), BX
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MOVB new+4(FP), AX
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XCHGB AX, 0(BX)
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MOVB AX, ret+8(FP)
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RET
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TEXT ·Xchg(SB), NOSPLIT, $0-12
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MOVL ptr+0(FP), BX
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MOVL new+4(FP), AX
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@ -2,7 +2,7 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build amd64 || arm64 || ppc64 || ppc64le
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//go:build 386 || amd64 || arm64 || ppc64 || ppc64le
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package atomic_test
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