issue4396a.go

     1  // run
     2  
     3  // Copyright 2012 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Issue 4396. Arrays of bytes are not required to be
     8  // word aligned. 5g should use MOVB to load the address
     9  // of s.g[0] for its nil check.
    10  //
    11  // This test _may_ fail on arm, but requires the host to 
    12  // trap unaligned loads. This is generally done with
    13  //
    14  // echo "4" > /proc/cpu/alignment
    15  
    16  package main
    17  
    18  var s = struct {
    19  	// based on lzw.decoder
    20  	a, b, c, d, e uint16
    21  	f             [4096]uint8
    22  	g             [4096]uint8
    23  }{}
    24  
    25  func main() {
    26  	s.g[0] = 1
    27  }
    28
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