// amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZW"
	// mips:"CLZ"
	// wasm:"I64Clz"
	// ppc64x:"CNTLZW"
	return bits.LeadingZeros32(n)
}

func LeadingZeros16(n uint16) int {
	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"

// Use 64-bit version to allow const-fold remove unnecessary arithmetic.
(BitLen32 <t> x) && buildcfg.GOAMD64 >= 3 => (NEGQ (ADDQconst <t> [-32] (LZCNTL x)))
(BitLen16 <t> x) && buildcfg.GOAMD64 >= 3 => (NEGQ (ADDQconst <t> [-32] (LZCNTL (MOVWQZX <x.Type> x))))
(BitLen8 <t> x) && buildcfg.GOAMD64 >= 3 => (NEGQ (ADDQconst <t> [-32] (LZCNTL (MOVBQZX <x.Type> x))))

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

//go:build darwin || dragonfly || freebsd || netbsd || openbsd

package syscall

import "unsafe"

// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
	_, err := fcntlPtr(int(fd), cmd, unsafe.Pointer(lk))
	return err

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

//go:build (linux && 386) || (linux && arm) || (linux && mips) || (linux && mipsle)

package syscall

func init() {
	// On 32-bit Linux systems, the fcntl syscall that matches Go's
	// Flock_t type is SYS_FCNTL64, not SYS_FCNTL.
	fcntl64Syscall = SYS_FCNTL64

// used by internal/poll
//go:linkname fdopendir

// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat

// used by cmd/link
//go:linkname msync

	}
	return ts.tv_sec, int32(ts.tv_nsec)
}

//go:nosplit
func fcntl(fd, cmd, arg int32) (int32, int32) {
	r, errno := syscall3(&libc_fcntl, uintptr(fd), uintptr(cmd), uintptr(arg))
	return int32(r), int32(errno)
}

//go:nosplit
func setNonblock(fd int32) {
	flags, _ := fcntl(fd, _F_GETFL, 0)
	if flags != -1 {
		fcntl(fd, _F_SETFL, flags|_O_NONBLOCK)
	}
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package runtime

import _ "unsafe"

// used in internal/syscall/unix

// Support for SOCK_* flags as part of the type parameter was added to Oracle
// Solaris in the 11.4 release. Thus, on releases prior to 11.4, we fall back
// to the combination of socket(3c) and fcntl(2).

package net

import (
	"internal/poll"
	"internal/syscall/unix"
	"os"
	"syscall"
)

// Wrapper around the socket system call that marks the returned file

import "unsafe"

// fcntl64Syscall is usually SYS_FCNTL, but is overridden on 32-bit Linux
// systems by flock_linux_32bit.go to be SYS_FCNTL64.
var fcntl64Syscall uintptr = SYS_FCNTL

// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
	_, _, errno := Syscall(fcntl64Syscall, fd, uintptr(cmd), uintptr(unsafe.Pointer(lk)))
	if errno == 0 {

		v1.AddArg(x)
		v0.AddArg2(v1, v1)
		v.AddArg(v0)
		return true
	}
	// match: (BitLen16 <t> x)
	// cond: buildcfg.GOAMD64 >= 3
	// result: (NEGQ (ADDQconst <t> [-32] (LZCNTL (MOVWQZX <x.Type> x))))
	for {
		t := v.Type
		x := v_0
		if !(buildcfg.GOAMD64 >= 3) {
			break
		}
		v.reset(OpAMD64NEGQ)
		v0 := b.NewValue0(v.Pos, OpAMD64ADDQconst, t)