memory_avx2_amd64.go

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build !noasm
// +build !noasm

package memory

import "unsafe"

//go:noescape
func _memset_avx2(buf unsafe.Pointer, len, c uintptr)

func memory_memset_avx2(buf []byte, c byte) {
	if len(buf) == 0 {
		return
	}

	var (
		p1 = unsafe.Pointer(&buf[0])
		p2 = uintptr(len(buf))
		p3 = uintptr(c)
	)
	if len(buf) > 2000 || isMultipleOfPowerOf2(len(buf), 256) {
		_memset_avx2(p1, p2, p3)
	} else {
		_memset_sse4(p1, p2, p3)
	}
}