-
Notifications
You must be signed in to change notification settings - Fork 0
/
copy.go
90 lines (74 loc) · 1.72 KB
/
copy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
// asmcheck
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package codegen
import "runtime"
// Check small copies are replaced with moves.
func movesmall4() {
x := [...]byte{1, 2, 3, 4}
// 386:-".*memmove"
// amd64:-".*memmove"
// arm:-".*memmove"
// arm64:-".*memmove"
// ppc64:-".*memmove"
// ppc64le:-".*memmove"
copy(x[1:], x[:])
}
func movesmall7() {
x := [...]byte{1, 2, 3, 4, 5, 6, 7}
// 386:-".*memmove"
// amd64:-".*memmove"
// arm64:-".*memmove"
// ppc64:-".*memmove"
// ppc64le:-".*memmove"
copy(x[1:], x[:])
}
func movesmall16() {
x := [...]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
// amd64:-".*memmove"
copy(x[1:], x[:])
}
var x [256]byte
// Check that large disjoint copies are replaced with moves.
func moveDisjointStack() {
var s [256]byte
// s390x:-".*memmove"
// amd64:-".*memmove"
copy(s[:], x[:])
runtime.KeepAlive(&s)
}
func moveDisjointArg(b *[256]byte) {
var s [256]byte
// s390x:-".*memmove"
// amd64:-".*memmove"
copy(s[:], b[:])
runtime.KeepAlive(&s)
}
func moveDisjointNoOverlap(a *[256]byte) {
// s390x:-".*memmove"
// amd64:-".*memmove"
copy(a[:], a[128:])
}
// Check that no branches are generated when the pointers are [not] equal.
func ptrEqual() {
// amd64:-"JEQ",-"JNE"
// ppc64:-"BEQ",-"BNE"
// ppc64le:-"BEQ",-"BNE"
// s390x:-"BEQ",-"BNE"
copy(x[:], x[:])
}
func ptrOneOffset() {
// amd64:-"JEQ",-"JNE"
// ppc64:-"BEQ",-"BNE"
// ppc64le:-"BEQ",-"BNE"
// s390x:-"BEQ",-"BNE"
copy(x[1:], x[:])
}
func ptrBothOffset() {
// amd64:-"JEQ",-"JNE"
// ppc64:-"BEQ",-"BNE"
// ppc64le:-"BEQ",-"BNE"
// s390x:-"BEQ",-"BNE"
copy(x[1:], x[2:])
}