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Source file src/runtime/cpuflags_amd64.go

Documentation: runtime

  // Copyright 2015 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.
  
  package runtime
  
  import (
  	"internal/cpu"
  	"unsafe"
  )
  
  // Offsets into internal/cpu records for use in assembly.
  const (
  	offsetX86HasAVX2 = unsafe.Offsetof(cpu.X86.HasAVX2)
  )
  
  var useAVXmemmove bool
  
  func init() {
  	// Let's remove stepping and reserved fields
  	processor := processorVersionInfo & 0x0FFF3FF0
  
  	isIntelBridgeFamily := isIntel &&
  		processor == 0x206A0 ||
  		processor == 0x206D0 ||
  		processor == 0x306A0 ||
  		processor == 0x306E0
  
  	useAVXmemmove = cpu.X86.HasAVX && !isIntelBridgeFamily
  }
  

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