Text file
src/runtime/memclr_s390x.s
Documentation: runtime
1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#include "textflag.h"
6
7// See memclrNoHeapPointers Go doc for important implementation constraints.
8
9// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
10TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT|NOFRAME,$0-16
11 MOVD ptr+0(FP), R4
12 MOVD n+8(FP), R5
13
14start:
15 CMPBLE R5, $3, clear0to3
16 CMPBLE R5, $7, clear4to7
17 CMPBLE R5, $11, clear8to11
18 CMPBLE R5, $15, clear12to15
19 CMP R5, $32
20 BGE clearmt32
21 MOVD $0, 0(R4)
22 MOVD $0, 8(R4)
23 ADD $16, R4
24 SUB $16, R5
25 BR start
26
27clear0to3:
28 CMPBEQ R5, $0, done
29 CMPBNE R5, $1, clear2
30 MOVB $0, 0(R4)
31 RET
32clear2:
33 CMPBNE R5, $2, clear3
34 MOVH $0, 0(R4)
35 RET
36clear3:
37 MOVH $0, 0(R4)
38 MOVB $0, 2(R4)
39 RET
40
41clear4to7:
42 CMPBNE R5, $4, clear5
43 MOVW $0, 0(R4)
44 RET
45clear5:
46 CMPBNE R5, $5, clear6
47 MOVW $0, 0(R4)
48 MOVB $0, 4(R4)
49 RET
50clear6:
51 CMPBNE R5, $6, clear7
52 MOVW $0, 0(R4)
53 MOVH $0, 4(R4)
54 RET
55clear7:
56 MOVW $0, 0(R4)
57 MOVH $0, 4(R4)
58 MOVB $0, 6(R4)
59 RET
60
61clear8to11:
62 CMPBNE R5, $8, clear9
63 MOVD $0, 0(R4)
64 RET
65clear9:
66 CMPBNE R5, $9, clear10
67 MOVD $0, 0(R4)
68 MOVB $0, 8(R4)
69 RET
70clear10:
71 CMPBNE R5, $10, clear11
72 MOVD $0, 0(R4)
73 MOVH $0, 8(R4)
74 RET
75clear11:
76 MOVD $0, 0(R4)
77 MOVH $0, 8(R4)
78 MOVB $0, 10(R4)
79 RET
80
81clear12to15:
82 CMPBNE R5, $12, clear13
83 MOVD $0, 0(R4)
84 MOVW $0, 8(R4)
85 RET
86clear13:
87 CMPBNE R5, $13, clear14
88 MOVD $0, 0(R4)
89 MOVW $0, 8(R4)
90 MOVB $0, 12(R4)
91 RET
92clear14:
93 CMPBNE R5, $14, clear15
94 MOVD $0, 0(R4)
95 MOVW $0, 8(R4)
96 MOVH $0, 12(R4)
97 RET
98clear15:
99 MOVD $0, 0(R4)
100 MOVW $0, 8(R4)
101 MOVH $0, 12(R4)
102 MOVB $0, 14(R4)
103 RET
104
105clearmt32:
106 CMP R5, $256
107 BLT clearlt256
108 XC $256, 0(R4), 0(R4)
109 ADD $256, R4
110 ADD $-256, R5
111 BR clearmt32
112clearlt256:
113 CMPBEQ R5, $0, done
114 ADD $-1, R5
115 EXRL $memclr_exrl_xc<>(SB), R5
116done:
117 RET
118
119// DO NOT CALL - target for exrl (execute relative long) instruction.
120TEXT memclr_exrl_xc<>(SB),NOSPLIT|NOFRAME,$0-0
121 XC $1, 0(R4), 0(R4)
122 MOVD $0, 0(R0)
123 RET
124
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