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