// but check that all three don't return the same number (1 in 2^64 chance)
	{
		x, y, z := fastrand(), fastrand(), fastrand()
		if x == y && y == z {
			t.Fatalf("fastrand three times = %#x, %#x, %#x, want different numbers", x, y, z)
		}
	}
	{
		x, y, z := fastrandn(1e9), fastrandn(1e9), fastrandn(1e9)
		if x == y && y == z {
			t.Fatalf("fastrandn three times = %#x, %#x, %#x, want different numbers", x, y, z)
		}
	}
	{

// Too much legacy code has go:linkname references
// to runtime.fastrand and friends, so keep these around for now.
// Code should migrate to math/rand/v2.Uint64,
// which is just as fast, but that's only available in Go 1.22+.
// It would be reasonable to remove these in Go 1.24.
// Do not call these from package runtime.

//go:linkname legacy_fastrand runtime.fastrand
func legacy_fastrand() uint32 {
	return uint32(rand())
}

// license that can be found in the LICENSE file.

// Linkname fastrand is allowed _for now_, as it has a
// linknamed definition, for legacy reason.
// NOTE: this may not be allowed in the future. Don't do this!

package main

import _ "unsafe"

//go:linkname fastrand runtime.fastrand
func fastrand() uint32

func main() {
	println(fastrand())

		if s.state.get() == mSpanInUse {
			counted += s.npages
		}
	}

	startTheWorld(stw)

	return
}

func Fastrand() uint32          { return uint32(rand()) }
func Fastrand64() uint64        { return rand() }
func Fastrandn(n uint32) uint32 { return randn(n) }

type ProfBuf profBuf

func NewProfBuf(hdrsize, bufwords, tags int) *ProfBuf {

// convenience functions.
var globalRand = &Rand{src: runtimeSource{}}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is a Source that uses the runtime fastrand functions.
type runtimeSource struct{}

func (runtimeSource) Uint64() uint64 {
	return runtime_rand()
}

// Int64 returns a non-negative pseudo-random 63-bit integer as an int64

		return globalRandGenerator.Load()
	}

	return r
}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is an implementation of Source64 that uses the runtime
// fastrand functions.
type runtimeSource struct {
	// The mutex is used to avoid race conditions in Read.
	mu sync.Mutex
}

func (*runtimeSource) Int63() int64 {
	return int64(runtime_rand() & rngMask)
}

		{"coro_var.go", false},
		// assembly reference is not ok
		{"coro_asm", false},
		// pull-only linkname is not ok
		{"coro2.go", false},
		// legacy bad linkname is ok, for now
		{"fastrand.go", true},
		{"badlinkname.go", true},
	}
	for _, test := range tests {
		test := test
		t.Run(test.src, func(t *testing.T) {
			t.Parallel()
			src := filepath.Join("testdata", "linkname", test.src)

github.com/valyala/fasthttp,v1.6.0,h1:uWF8lgKmeaIewWVPwi4GRq2P6+R46IgYZdxWtM+GtEY=,b15a953ed5395599871097c94977d21c026205e6ca7ad6e340cd595096d5840e
github.com/valyala/fastrand,v1.0.0,h1:LUKT9aKer2dVQNUi3waewTbKV+7H17kvWFNKs2ObdkI=,ed2166483141b4f3d59ee07975a5d91990e4c17f36c919565b8063c0cb02f7ed