sink = &s // force heap allocation
	s.a[0] = 2
	zero(&s.a)
	if s.a[0] != 0 {
		println("s.a[0] =", s.a[0])
		panic("zeroing failed")
	}

	var a T // on stack
	a[0] = 2
	zero(&a)
	if a[0] != 0 {
		println("a[0] =", a[0])
		panic("zeroing failed")
	}

}

// evexSuffixBits carries instruction EVEX suffix set flags.
//
// Examples:
//
//	"RU_SAE.Z" => {rounding: 3, zeroing: true}
//	"Z" => {zeroing: true}
//	"BCST" => {broadcast: true}
//	"SAE.Z" => {sae: true, zeroing: true}
type evexSuffix struct {
	rounding  byte
	sae       bool
	zeroing   bool
	broadcast bool
}

// Rounding control values.

// asmcheck

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test that we are zeroing directly instead of
// copying a large zero value. Issue 38554.

package codegen

func retlarge() [256]byte {
	// amd64:-"DUFFCOPY"
	return [256]byte{}

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

// Some uses of zeroed constants in non-assignment
// expressions broke with our more aggressive zeroing
// of assignments (internal compiler errors).

package main

func f1() {
	type T [2]int
	p := T{0, 1}
	switch p {
	case T{0, 0}:
		panic("wrong1")
	case T{0, 1}:
		// ok
	default:

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

package main

import "math"

func checkClearSlice() {
	s := []int{1, 2, 3}
	clear(s)
	for i := range s {
		if s[i] != 0 {
			panic("clear not zeroing slice elem")
		}
	}

	clear([]int{})
}

func checkClearMap() {
	m1 := make(map[int]int)
	m1[0] = 0
	m1[1] = 1
	clear(m1)
	if len(m1) != 0 {
		panic("m1 is not cleared")
	}

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

package codegen

// This file contains code generation tests related to the handling of
// struct types.

// ------------- //
//    Zeroing    //
// ------------- //

type Z1 struct {
	a, b, c int
}

func Zero1(t *Z1) { // Issue #18370
	// amd64:`MOVUPS\tX[0-9]+, \(.*\)`,`MOVQ\t\$0, 16\(.*\)`
	*t = Z1{}
}

type Z2 struct {

// run

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Issue 8155.
// Alignment of stack prologue zeroing was wrong on 64-bit Native Client
// (because of 32-bit pointers).

package main

import "runtime"

func bad(b bool) uintptr {
	var p **int
	var x1 uintptr
	x1 = 1
	if b {
		var x [11]*int
		p = &x[0]

	VMAXPD.SAE (AX), Z2, K1, Z1      // ERROR "illegal SAE with memory argument"
	VADDPD.SAE X3, X2, K1, X1        // ERROR "unsupported SAE"
	// Unsupported zeroing.
	VFPCLASSPDX.Z $0, (AX), K2, K1   // ERROR "unsupported zeroing"
	VFPCLASSPDY.Z $0, (AX), K2, K1   // ERROR "unsupported zeroing"
	// Unsupported broadcast.
	VFPCLASSSD.BCST $0, (AX), K2, K1 // ERROR "unsupported broadcast"

// runoutput

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Check that {5,6,8,9}g/ggen.c:clearfat is zeroing the entire object.

package main

import (
	"bytes"
	"fmt"
	"strconv"
	"strings"
)

const ntest = 1100

func main() {
	var decls, calls bytes.Buffer

	for i := 1; i <= ntest; i++ {

// void runtime·memclrNoHeapPointers(void*, uintptr)
TEXT runtime·memclrNoHeapPointers<ABIInternal>(SB),NOSPLIT,$0-16
	// X10 = ptr
	// X11 = n

	// If less than 8 bytes, do single byte zeroing.
	MOV	$8, X9
	BLT	X11, X9, check4

	// Check alignment
	AND	$7, X10, X5
	BEQZ	X5, aligned

	// Zero one byte at a time until we reach 8 byte alignment.
	SUB	X5, X9, X5
	SUB	X5, X11, X11
align: