acos_s390x.s raw
1 // Copyright 2017 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 // Minimax polynomial coefficients and other constants
8 DATA ·acosrodataL13<> + 0(SB)/8, $0.314159265358979323E+01 //pi
9 DATA ·acosrodataL13<> + 8(SB)/8, $-0.0
10 DATA ·acosrodataL13<> + 16(SB)/8, $0x7ff8000000000000 //Nan
11 DATA ·acosrodataL13<> + 24(SB)/8, $-1.0
12 DATA ·acosrodataL13<> + 32(SB)/8, $1.0
13 DATA ·acosrodataL13<> + 40(SB)/8, $0.166666666666651626E+00
14 DATA ·acosrodataL13<> + 48(SB)/8, $0.750000000042621169E-01
15 DATA ·acosrodataL13<> + 56(SB)/8, $0.446428567178116477E-01
16 DATA ·acosrodataL13<> + 64(SB)/8, $0.303819660378071894E-01
17 DATA ·acosrodataL13<> + 72(SB)/8, $0.223715011892010405E-01
18 DATA ·acosrodataL13<> + 80(SB)/8, $0.173659424522364952E-01
19 DATA ·acosrodataL13<> + 88(SB)/8, $0.137810186504372266E-01
20 DATA ·acosrodataL13<> + 96(SB)/8, $0.134066870961173521E-01
21 DATA ·acosrodataL13<> + 104(SB)/8, $-.412335502831898721E-02
22 DATA ·acosrodataL13<> + 112(SB)/8, $0.867383739532082719E-01
23 DATA ·acosrodataL13<> + 120(SB)/8, $-.328765950607171649E+00
24 DATA ·acosrodataL13<> + 128(SB)/8, $0.110401073869414626E+01
25 DATA ·acosrodataL13<> + 136(SB)/8, $-.270694366992537307E+01
26 DATA ·acosrodataL13<> + 144(SB)/8, $0.500196500770928669E+01
27 DATA ·acosrodataL13<> + 152(SB)/8, $-.665866959108585165E+01
28 DATA ·acosrodataL13<> + 160(SB)/8, $-.344895269334086578E+01
29 DATA ·acosrodataL13<> + 168(SB)/8, $0.927437952918301659E+00
30 DATA ·acosrodataL13<> + 176(SB)/8, $0.610487478874645653E+01
31 DATA ·acosrodataL13<> + 184(SB)/8, $0.157079632679489656e+01
32 DATA ·acosrodataL13<> + 192(SB)/8, $0.0
33 GLOBL ·acosrodataL13<> + 0(SB), RODATA, $200
34
35 // Acos returns the arccosine, in radians, of the argument.
36 //
37 // Special case is:
38 // Acos(x) = NaN if x < -1 or x > 1
39 // The algorithm used is minimax polynomial approximation
40 // with coefficients determined with a Remez exchange algorithm.
41
42 TEXT ·acosAsm(SB), NOSPLIT, $0-16
43 FMOVD x+0(FP), F0
44 MOVD $·acosrodataL13<>+0(SB), R9
45 LGDR F0, R12
46 FMOVD F0, F10
47 SRAD $32, R12
48 WORD $0xC0293FE6 //iilf %r2,1072079005
49 BYTE $0xA0
50 BYTE $0x9D
51 WORD $0xB917001C //llgtr %r1,%r12
52 CMPW R1,R2
53 BGT L2
54 FMOVD 192(R9), F8
55 FMADD F0, F0, F8
56 FMOVD 184(R9), F1
57 L3:
58 WFMDB V8, V8, V2
59 FMOVD 176(R9), F6
60 FMOVD 168(R9), F0
61 FMOVD 160(R9), F4
62 WFMADB V2, V0, V6, V0
63 FMOVD 152(R9), F6
64 WFMADB V2, V4, V6, V4
65 FMOVD 144(R9), F6
66 WFMADB V2, V0, V6, V0
67 FMOVD 136(R9), F6
68 WFMADB V2, V4, V6, V4
69 FMOVD 128(R9), F6
70 WFMADB V2, V0, V6, V0
71 FMOVD 120(R9), F6
72 WFMADB V2, V4, V6, V4
73 FMOVD 112(R9), F6
74 WFMADB V2, V0, V6, V0
75 FMOVD 104(R9), F6
76 WFMADB V2, V4, V6, V4
77 FMOVD 96(R9), F6
78 WFMADB V2, V0, V6, V0
79 FMOVD 88(R9), F6
80 WFMADB V2, V4, V6, V4
81 FMOVD 80(R9), F6
82 WFMADB V2, V0, V6, V0
83 FMOVD 72(R9), F6
84 WFMADB V2, V4, V6, V4
85 FMOVD 64(R9), F6
86 WFMADB V2, V0, V6, V0
87 FMOVD 56(R9), F6
88 WFMADB V2, V4, V6, V4
89 FMOVD 48(R9), F6
90 WFMADB V2, V0, V6, V0
91 FMOVD 40(R9), F6
92 WFMADB V2, V4, V6, V2
93 FMOVD 192(R9), F4
94 WFMADB V8, V0, V2, V0
95 WFMADB V10, V8, V4, V8
96 FMADD F0, F8, F10
97 WFSDB V10, V1, V10
98 L1:
99 FMOVD F10, ret+8(FP)
100 RET
101
102 L2:
103 WORD $0xC0293FEF //iilf %r2,1072693247
104 BYTE $0xFF
105 BYTE $0xFF
106 CMPW R1, R2
107 BLE L12
108 L4:
109 WORD $0xED009020 //cdb %f0,.L34-.L13(%r9)
110 BYTE $0x00
111 BYTE $0x19
112 BEQ L8
113 WORD $0xED009018 //cdb %f0,.L35-.L13(%r9)
114 BYTE $0x00
115 BYTE $0x19
116 BEQ L9
117 WFCEDBS V10, V10, V0
118 BVS L1
119 FMOVD 16(R9), F10
120 BR L1
121 L12:
122 FMOVD 24(R9), F0
123 FMADD F10, F10, F0
124 LCDBR F0, F8
125 WORD $0xED009008 //cdb %f0,.L37-.L13(%r9)
126 BYTE $0x00
127 BYTE $0x19
128 FSQRT F8, F10
129 L5:
130 MOVW R12, R4
131 CMPBLE R4, $0, L7
132 LCDBR F10, F10
133 FMOVD $0, F1
134 BR L3
135 L9:
136 FMOVD 0(R9), F10
137 BR L1
138 L8:
139 FMOVD $0, F0
140 FMOVD F0, ret+8(FP)
141 RET
142 L7:
143 FMOVD 0(R9), F1
144 BR L3
145