twice.
</p>

<h3 id="atomic">Atomic Values</h3>

<p>
The APIs in the <a href="/pkg/sync/atomic/"><code>sync/atomic</code></a>
package are collectively “atomic operations”
that can be used to synchronize the execution of different goroutines.
If the effect of an atomic operation <i>A</i> is observed by atomic operation <i>B</i>,
then <i>A</i> is synchronized before <i>B</i>.

pkg sync/atomic, method (*Uintptr) Load() uintptr #50860
pkg sync/atomic, method (*Uintptr) Store(uintptr) #50860
pkg sync/atomic, method (*Uintptr) Swap(uintptr) uintptr #50860
pkg sync/atomic, type Bool struct #50860
pkg sync/atomic, type Int32 struct #50860
pkg sync/atomic, type Int64 struct #50860
pkg sync/atomic, type Pointer[$0 interface{}] struct #50860
pkg sync/atomic, type Uint32 struct #50860

	{"racecall<>(SB)", "racecall<>(SB)"},
	{"rcv_name+20(FP)", "rcv_name+20(FP)"},
	{"retoffset+28(FP)", "retoffset+28(FP)"},
	{"runtime·_GetStdHandle(SB)", "runtime._GetStdHandle(SB)"},
	{"sync\u2215atomic·AddInt64(SB)", "sync/atomic.AddInt64(SB)"},
	{"timeout+20(FP)", "timeout+20(FP)"},
	{"ts+16(FP)", "ts+16(FP)"},
	{"x+24(FP)", "x+24(FP)"},
	{"x·y(SB)", "x.y(SB)"},
	{"x·y(SP)", "x.y(SP)"},
	{"x·y+8(SB)", "x.y+8(SB)"},

		return
	}

	var parseError error
	atoi := func(s string) int {
		x, err := strconv.Atoi(s)
		if err != nil && parseError == nil {
			parseError = err
		}
		return x
	}
	var major, minor, patch int
	major = atoi(string(matches[1]))
	if len(matches[2]) > 0 {
		minor = atoi(string(matches[2][1:]))
	}
	if len(matches[3]) > 0 {
		patch = atoi(string(matches[3][1:]))
	}
	if parseError != nil {

and <code>WORD</code> directives
to lay down explicit data into the instruction stream within a <code>TEXT</code>.
Here's how the 386 runtime defines the 64-bit atomic load function.
</p>

<pre>
// uint64 atomicload64(uint64 volatile* addr);
// so actually
// void atomicload64(uint64 *res, uint64 volatile *addr);
TEXT runtime·atomicload64(SB), NOSPLIT, $0-12

	case arm64.ASTLXRB, arm64.ASTLXRH, arm64.ASTLXRW, arm64.ASTLXR,
		arm64.ASTXRB, arm64.ASTXRH, arm64.ASTXRW, arm64.ASTXR,
		arm64.ASTXP, arm64.ASTXPW, arm64.ASTLXP, arm64.ASTLXPW:
		return true
	}
	// LDADDx/SWPx/CASx atomic instructions
	return arm64.IsAtomicInstruction(op)
}

// IsARM64TBL reports whether the op (as defined by an arm64.A*
// constant) is one of the TBL-like instructions and one of its

pkg runtime/cgo (openbsd-amd64-cgo), type Handle uintptr
pkg strconv, func QuotedPrefix(string) (string, error)
pkg sync/atomic, method (*Value) CompareAndSwap(interface{}, interface{}) bool
pkg sync/atomic, method (*Value) Swap(interface{}) interface{}
pkg syscall (netbsd-386), const SYS_WAIT6 = 481
pkg syscall (netbsd-386), const SYS_WAIT6 ideal-int

	CINC	EQ, R4, R9	// 8914849a
	CINCW	PL, R2, ZR	// 5f44821a
	CINV	PL, R11, R22	// 76418bda
	CINVW	LS, R7, R13	// ed80875a
	CNEG	LS, R13, R7	// a7858dda
	CNEGW	EQ, R8, R13	// 0d15885a

// atomic ops
	LDARB	(R25), R2                            // 22ffdf08
	LDARH	(R5), R7                             // a7fcdf48
	LDAXPW	(R10), (R20, R16)                    // 54c17f88

			if n, err := strconv.Atoi(s[len("__cgodebug_str__"):]); err == nil {
				return n
			}
		}
		return -1
	}
	indexOfDebugStrlen := func(s string) int {
		// Some systems use leading _ to denote non-assembly symbols.
		if strings.HasPrefix(s, "___") {
			s = s[1:]
		}
		if strings.HasPrefix(s, "__cgodebug_strlen__") {
			if n, err := strconv.Atoi(s[len("__cgodebug_strlen__"):]); err == nil {

	// 8.2: Load-Reserved/Store-Conditional
	LRW	(X5), X6				// 2fa30214
	LRD	(X5), X6				// 2fb30214
	SCW	X5, (X6), X7				// af23531a
	SCD	X5, (X6), X7				// af33531a

	// 8.3: Atomic Memory Operations
	AMOSWAPW	X5, (X6), X7			// af23530e
	AMOSWAPD	X5, (X6), X7			// af33530e
	AMOADDW		X5, (X6), X7			// af235306
	AMOADDD		X5, (X6), X7			// af335306
	AMOANDW		X5, (X6), X7			// af235366