cpu_loong64_hwcap.mx raw

   1  // Copyright 2023 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  //go:build loong64 && linux
   6  
   7  package cpu
   8  
   9  // This is initialized by archauxv and should not be changed after it is
  10  // initialized.
  11  var HWCap uint
  12  
  13  // HWCAP bits. These are exposed by the Linux kernel.
  14  const (
  15  	hwcap_LOONGARCH_LSX  = 1 << 4
  16  	hwcap_LOONGARCH_LASX = 1 << 5
  17  )
  18  
  19  func hwcapInit() {
  20  	// TODO: Features that require kernel support like LSX and LASX can
  21  	// be detected here once needed in std library or by the compiler.
  22  	Loong64.HasLSX = hwcIsSet(HWCap, hwcap_LOONGARCH_LSX)
  23  	Loong64.HasLASX = hwcIsSet(HWCap, hwcap_LOONGARCH_LASX)
  24  }
  25  
  26  func hwcIsSet(hwc uint, val uint) bool {
  27  	return hwc&val != 0
  28  }
  29