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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /*---------------------------------------------------------------------------+ |
3 | | mul_Xsig.S | | |
4 | | | | |
5 | | Multiply a 12 byte fixed point number by another fixed point number. | | |
6 | | | | |
7 | | Copyright (C) 1992,1994,1995 | | |
8 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | | |
9 | | Australia. E-mail billm@jacobi.maths.monash.edu.au | | |
10 | | | | |
11 | | Call from C as: | | |
12 | | void mul32_Xsig(Xsig *x, unsigned b) | | |
13 | | | | |
14 | | void mul64_Xsig(Xsig *x, unsigned long long *b) | | |
15 | | | | |
16 | | void mul_Xsig_Xsig(Xsig *x, unsigned *b) | | |
17 | | | | |
18 | | The result is neither rounded nor normalized, and the ls bit or so may | | |
19 | | be wrong. | | |
20 | | | | |
21 | +---------------------------------------------------------------------------*/ | |
22 | .file "mul_Xsig.S" | |
23 | ||
24 | ||
25 | #include "fpu_emu.h" | |
26 | ||
27 | .text | |
28 | ENTRY(mul32_Xsig) | |
29 | pushl %ebp | |
30 | movl %esp,%ebp | |
31 | subl $16,%esp | |
32 | pushl %esi | |
33 | ||
34 | movl PARAM1,%esi | |
35 | movl PARAM2,%ecx | |
36 | ||
37 | xor %eax,%eax | |
38 | movl %eax,-4(%ebp) | |
39 | movl %eax,-8(%ebp) | |
40 | ||
41 | movl (%esi),%eax /* lsl of Xsig */ | |
42 | mull %ecx /* msl of b */ | |
43 | movl %edx,-12(%ebp) | |
44 | ||
45 | movl 4(%esi),%eax /* midl of Xsig */ | |
46 | mull %ecx /* msl of b */ | |
47 | addl %eax,-12(%ebp) | |
48 | adcl %edx,-8(%ebp) | |
49 | adcl $0,-4(%ebp) | |
50 | ||
51 | movl 8(%esi),%eax /* msl of Xsig */ | |
52 | mull %ecx /* msl of b */ | |
53 | addl %eax,-8(%ebp) | |
54 | adcl %edx,-4(%ebp) | |
55 | ||
56 | movl -12(%ebp),%eax | |
57 | movl %eax,(%esi) | |
58 | movl -8(%ebp),%eax | |
59 | movl %eax,4(%esi) | |
60 | movl -4(%ebp),%eax | |
61 | movl %eax,8(%esi) | |
62 | ||
63 | popl %esi | |
64 | leave | |
65 | ret | |
bd6be579 | 66 | ENDPROC(mul32_Xsig) |
1da177e4 LT |
67 | |
68 | ||
69 | ENTRY(mul64_Xsig) | |
70 | pushl %ebp | |
71 | movl %esp,%ebp | |
72 | subl $16,%esp | |
73 | pushl %esi | |
74 | ||
75 | movl PARAM1,%esi | |
76 | movl PARAM2,%ecx | |
77 | ||
78 | xor %eax,%eax | |
79 | movl %eax,-4(%ebp) | |
80 | movl %eax,-8(%ebp) | |
81 | ||
82 | movl (%esi),%eax /* lsl of Xsig */ | |
83 | mull 4(%ecx) /* msl of b */ | |
84 | movl %edx,-12(%ebp) | |
85 | ||
86 | movl 4(%esi),%eax /* midl of Xsig */ | |
87 | mull (%ecx) /* lsl of b */ | |
88 | addl %edx,-12(%ebp) | |
89 | adcl $0,-8(%ebp) | |
90 | adcl $0,-4(%ebp) | |
91 | ||
92 | movl 4(%esi),%eax /* midl of Xsig */ | |
93 | mull 4(%ecx) /* msl of b */ | |
94 | addl %eax,-12(%ebp) | |
95 | adcl %edx,-8(%ebp) | |
96 | adcl $0,-4(%ebp) | |
97 | ||
98 | movl 8(%esi),%eax /* msl of Xsig */ | |
99 | mull (%ecx) /* lsl of b */ | |
100 | addl %eax,-12(%ebp) | |
101 | adcl %edx,-8(%ebp) | |
102 | adcl $0,-4(%ebp) | |
103 | ||
104 | movl 8(%esi),%eax /* msl of Xsig */ | |
105 | mull 4(%ecx) /* msl of b */ | |
106 | addl %eax,-8(%ebp) | |
107 | adcl %edx,-4(%ebp) | |
108 | ||
109 | movl -12(%ebp),%eax | |
110 | movl %eax,(%esi) | |
111 | movl -8(%ebp),%eax | |
112 | movl %eax,4(%esi) | |
113 | movl -4(%ebp),%eax | |
114 | movl %eax,8(%esi) | |
115 | ||
116 | popl %esi | |
117 | leave | |
118 | ret | |
bd6be579 | 119 | ENDPROC(mul64_Xsig) |
1da177e4 LT |
120 | |
121 | ||
122 | ||
123 | ENTRY(mul_Xsig_Xsig) | |
124 | pushl %ebp | |
125 | movl %esp,%ebp | |
126 | subl $16,%esp | |
127 | pushl %esi | |
128 | ||
129 | movl PARAM1,%esi | |
130 | movl PARAM2,%ecx | |
131 | ||
132 | xor %eax,%eax | |
133 | movl %eax,-4(%ebp) | |
134 | movl %eax,-8(%ebp) | |
135 | ||
136 | movl (%esi),%eax /* lsl of Xsig */ | |
137 | mull 8(%ecx) /* msl of b */ | |
138 | movl %edx,-12(%ebp) | |
139 | ||
140 | movl 4(%esi),%eax /* midl of Xsig */ | |
141 | mull 4(%ecx) /* midl of b */ | |
142 | addl %edx,-12(%ebp) | |
143 | adcl $0,-8(%ebp) | |
144 | adcl $0,-4(%ebp) | |
145 | ||
146 | movl 8(%esi),%eax /* msl of Xsig */ | |
147 | mull (%ecx) /* lsl of b */ | |
148 | addl %edx,-12(%ebp) | |
149 | adcl $0,-8(%ebp) | |
150 | adcl $0,-4(%ebp) | |
151 | ||
152 | movl 4(%esi),%eax /* midl of Xsig */ | |
153 | mull 8(%ecx) /* msl of b */ | |
154 | addl %eax,-12(%ebp) | |
155 | adcl %edx,-8(%ebp) | |
156 | adcl $0,-4(%ebp) | |
157 | ||
158 | movl 8(%esi),%eax /* msl of Xsig */ | |
159 | mull 4(%ecx) /* midl of b */ | |
160 | addl %eax,-12(%ebp) | |
161 | adcl %edx,-8(%ebp) | |
162 | adcl $0,-4(%ebp) | |
163 | ||
164 | movl 8(%esi),%eax /* msl of Xsig */ | |
165 | mull 8(%ecx) /* msl of b */ | |
166 | addl %eax,-8(%ebp) | |
167 | adcl %edx,-4(%ebp) | |
168 | ||
169 | movl -12(%ebp),%edx | |
170 | movl %edx,(%esi) | |
171 | movl -8(%ebp),%edx | |
172 | movl %edx,4(%esi) | |
173 | movl -4(%ebp),%edx | |
174 | movl %edx,8(%esi) | |
175 | ||
176 | popl %esi | |
177 | leave | |
178 | ret | |
bd6be579 | 179 | ENDPROC(mul_Xsig_Xsig) |