// Copyright 2015 Netflix, Inc. // // Licensed 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. //+build amd64 // #Function copied from Damian Gryski's go-bits package // #Copyright 2015 Damian Gryski, under MIT license // #See the NOTICE file for more details. // #https://github.com/dgryski/go-bits // func lzcnt(x uint64) uint64 TEXT ·lzcnt(SB),4,$0-16 BSRQ x+0(FP), AX JZ zero SUBQ $63, AX NEGQ AX MOVQ AX, ret+8(FP) RET zero: MOVQ $64, ret+8(FP) RET