issue19137.go

     1  // compile
     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 19137: folding address into load/store causes
     8  // odd offset on ARM64.
     9  
    10  package p
    11  
    12  type T struct {
    13  	p *int
    14  	a [2]byte
    15  	b [6]byte // not 4-byte aligned
    16  }
    17  
    18  func f(b [6]byte) T {
    19  	var x [1000]int // a large stack frame
    20  	_ = x
    21  	return T{b: b}
    22  }
    23  
    24  // Arg symbol's base address may be not at an aligned offset to
    25  // SP. Folding arg's address into load/store may cause odd offset.
    26  func move(a, b [20]byte) [20]byte {
    27  	var x [1000]int // a large stack frame
    28  	_ = x
    29  	return b // b is not 8-byte aligned to SP
    30  }
    31  func zero() ([20]byte, [20]byte) {
    32  	var x [1000]int // a large stack frame
    33  	_ = x
    34  	return [20]byte{}, [20]byte{} // the second return value is not 8-byte aligned to SP
    35  }
    36  
    37  // Issue 21992: unaligned offset between 256 and 504 and handled
    38  // incorrectly.
    39  type T2 struct {
    40  	a [257]byte
    41  	// fields below are not 8-, 4-, 2-byte aligned
    42  	b [8]byte
    43  	c [4]byte
    44  	d [2]byte
    45  }
    46  
    47  func f2(x *T2) {
    48  	x.b = [8]byte{}
    49  	x.c = [4]byte{}
    50  	x.d = [2]byte{}
    51  }
    52
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