fence_amd64.s raw

   1  // Copyright 2023 The gVisor Authors.
   2  //
   3  // Licensed under the Apache License, Version 2.0 (the "License");
   4  // you may not use this file except in compliance with the License.
   5  // You may obtain a copy of the License at
   6  //
   7  //     http://www.apache.org/licenses/LICENSE-2.0
   8  //
   9  // Unless required by applicable law or agreed to in writing, software
  10  // distributed under the License is distributed on an "AS IS" BASIS,
  11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  // See the License for the specific language governing permissions and
  13  // limitations under the License.
  14  
  15  //go:build amd64
  16  // +build amd64
  17  
  18  #include "textflag.h"
  19  
  20  // func MemoryFenceReads()
  21  TEXT ·MemoryFenceReads(SB),NOSPLIT|NOFRAME,$0-0
  22  	// No memory fence is required on x86. However, a compiler fence is
  23  	// required to prevent the compiler from reordering memory accesses. The Go
  24  	// compiler will not reorder memory accesses around a call to an assembly
  25  	// function; compare runtime.publicationBarrier.
  26  	RET
  27