issue21048.go

     1  // run
     2  
     3  // Copyright 2017 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 21048: s390x merged address generation into stores
     8  // to unaligned global variables. This resulted in an illegal
     9  // instruction.
    10  
    11  package main
    12  
    13  type T struct {
    14  	_ [1]byte
    15  	a [2]byte // offset: 1
    16  	_ [3]byte
    17  	b [2]uint16 // offset: 6
    18  	_ [2]byte
    19  	c [2]uint32 // offset: 12
    20  	_ [2]byte
    21  	d [2]int16 // offset: 22
    22  	_ [2]byte
    23  	e [2]int32 // offset: 28
    24  }
    25  
    26  var Source, Sink T
    27  
    28  func newT() T {
    29  	return T{
    30  		a: [2]byte{1, 2},
    31  		b: [2]uint16{1, 2},
    32  		c: [2]uint32{1, 2},
    33  		d: [2]int16{1, 2},
    34  		e: [2]int32{1, 2},
    35  	}
    36  }
    37  
    38  //go:noinline
    39  func moves() {
    40  	Sink.a = Source.a
    41  	Sink.b = Source.b
    42  	Sink.c = Source.c
    43  	Sink.d = Source.d
    44  	Sink.e = Source.e
    45  }
    46  
    47  //go:noinline
    48  func loads() *T {
    49  	t := newT()
    50  	t.a = Source.a
    51  	t.b = Source.b
    52  	t.c = Source.c
    53  	t.d = Source.d
    54  	t.e = Source.e
    55  	return &t
    56  }
    57  
    58  //go:noinline
    59  func stores() {
    60  	t := newT()
    61  	Sink.a = t.a
    62  	Sink.b = t.b
    63  	Sink.c = t.c
    64  	Sink.d = t.d
    65  	Sink.e = t.e
    66  }
    67  
    68  func main() {
    69  	moves()
    70  	loads()
    71  	stores()
    72  }
    73
View as plain text