1/* SPDX-License-Identifier: GPL-2.0 */ 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 28ENTRY(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 66ENDPROC(mul32_Xsig) 67 68 69ENTRY(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 119ENDPROC(mul64_Xsig) 120 121 122 123ENTRY(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 179ENDPROC(mul_Xsig_Xsig) 180