projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f24c459c JH |
1 | /* |
| 2 | * polynomial.S | |
| 3 | * | |
| 4 | * Fixed point arithmetic polynomial evaluation. | |
| 5 | * | |
| 6 | * Call from C as: | |
| 7 | * void polynomial(unsigned accum[], unsigned x[], unsigned terms[][2], | |
| 8 | * int n) | |
| 9 | * | |
| 10 | * Computes: | |
| 11 | * terms[0] + (terms[1] + (terms[2] + ... + (terms[n-1]*x)*x)*x)*x) ... )*x | |
| 12 | * The result is returned in accum. | |
| 13 | * | |
| 14 | * | |
| 15 | * Copyright (C) 1992, 1993 W. Metzenthen, 22 Parker St, Ormond, | |
| 16 | * Vic 3163, Australia. | |
| 17 | * E-mail apm233m@vaxc.cc.monash.edu.au | |
| 18 | * All rights reserved. | |
| 19 | * | |
| 20 | * This copyright notice covers the redistribution and use of the | |
| 21 | * FPU emulator developed by W. Metzenthen. It covers only its use | |
| 22 | * in the 386BSD operating system. Any other use is not permitted | |
| 23 | * under this copyright. | |
| 24 | * | |
| 25 | * Redistribution and use in source and binary forms, with or without | |
| 26 | * modification, are permitted provided that the following conditions | |
| 27 | * are met: | |
| 28 | * 1. Redistributions of source code must retain the above copyright | |
| 29 | * notice, this list of conditions and the following disclaimer. | |
| 30 | * 2. Redistributions in binary form must include information specifying | |
| 31 | * that source code for the emulator is freely available and include | |
| 32 | * either: | |
| 33 | * a) an offer to provide the source code for a nominal distribution | |
| 34 | * fee, or | |
| 35 | * b) list at least two alternative methods whereby the source | |
| 36 | * can be obtained, e.g. a publically accessible bulletin board | |
| 37 | * and an anonymous ftp site from which the software can be | |
| 38 | * downloaded. | |
| 39 | * 3. All advertising materials specifically mentioning features or use of | |
| 40 | * this emulator must acknowledge that it was developed by W. Metzenthen. | |
| 41 | * 4. The name of W. Metzenthen may not be used to endorse or promote | |
| 42 | * products derived from this software without specific prior written | |
| 43 | * permission. | |
| 44 | * | |
| 45 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 46 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
| 47 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | |
| 48 | * W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 49 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 50 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 51 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 52 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 53 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 54 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 55 | * | |
| 56 | */ | |
| 57 | ||
| 58 | .file "fpolynom.s" | |
| 59 | ||
| 60 | #include "fpu_asm.h" | |
| 61 | ||
| 62 | ||
| 63 | /* #define EXTRA_PRECISE*/ | |
| 64 | ||
| 65 | #define TERM_SIZE $8 | |
| 66 | ||
| 67 | ||
| 68 | .text | |
| 69 | .align 2,144 | |
| 70 | .globl _polynomial | |
| 71 | _polynomial: | |
| 72 | pushl %ebp | |
| 73 | movl %esp,%ebp | |
| 74 | subl $32,%esp | |
| 75 | pushl %esi | |
| 76 | pushl %edi | |
| 77 | pushl %ebx | |
| 78 | ||
| 79 | movl PARAM1,%esi /* accum */ | |
| 80 | movl PARAM2,%edi /* x */ | |
| 81 | movl PARAM3,%ebx /* terms */ | |
| 82 | movl PARAM4,%ecx /* n */ | |
| 83 | ||
| 84 | movl TERM_SIZE,%eax | |
| 85 | mull %ecx | |
| 86 | movl %eax,%ecx | |
| 87 | ||
| 88 | movl 4(%ebx,%ecx,1),%edx /* terms[n] */ | |
| 89 | movl %edx,-20(%ebp) | |
| 90 | movl (%ebx,%ecx,1),%edx /* terms[n] */ | |
| 91 | movl %edx,-24(%ebp) | |
| 92 | xor %eax,%eax | |
| 93 | movl %eax,-28(%ebp) | |
| 94 | ||
| 95 | subl TERM_SIZE,%ecx | |
| 96 | js L_accum_done | |
| 97 | ||
| 98 | L_accum_loop: | |
| 99 | xor %eax,%eax | |
| 100 | movl %eax,-4(%ebp) | |
| 101 | movl %eax,-8(%ebp) | |
| 102 | ||
| 103 | #ifdef EXTRA_PRECISE | |
| 104 | movl -28(%ebp),%eax | |
| 105 | mull 4(%edi) /* x ms long */ | |
| 106 | movl %edx,-12(%ebp) | |
| 107 | #endif EXTRA_PRECISE | |
| 108 | ||
| 109 | movl -24(%ebp),%eax | |
| 110 | mull (%edi) /* x ls long */ | |
| 111 | /* movl %eax,-16(%ebp) */ /* Not needed */ | |
| 112 | addl %edx,-12(%ebp) | |
| 113 | adcl $0,-8(%ebp) | |
| 114 | ||
| 115 | movl -24(%ebp),%eax | |
| 116 | mull 4(%edi) /* x ms long */ | |
| 117 | addl %eax,-12(%ebp) | |
| 118 | adcl %edx,-8(%ebp) | |
| 119 | adcl $0,-4(%ebp) | |
| 120 | ||
| 121 | movl -20(%ebp),%eax | |
| 122 | mull (%edi) | |
| 123 | addl %eax,-12(%ebp) | |
| 124 | adcl %edx,-8(%ebp) | |
| 125 | adcl $0,-4(%ebp) | |
| 126 | ||
| 127 | movl -20(%ebp),%eax | |
| 128 | mull 4(%edi) | |
| 129 | addl %eax,-8(%ebp) | |
| 130 | adcl %edx,-4(%ebp) | |
| 131 | ||
| 132 | /* Now add the next term */ | |
| 133 | movl (%ebx,%ecx,1),%eax | |
| 134 | addl %eax,-8(%ebp) | |
| 135 | movl 4(%ebx,%ecx,1),%eax | |
| 136 | adcl %eax,-4(%ebp) | |
| 137 | ||
| 138 | /* And put into the second register */ | |
| 139 | movl -4(%ebp),%eax | |
| 140 | movl %eax,-20(%ebp) | |
| 141 | movl -8(%ebp),%eax | |
| 142 | movl %eax,-24(%ebp) | |
| 143 | ||
| 144 | #ifdef EXTRA_PRECISE | |
| 145 | movl -12(%ebp),%eax | |
| 146 | movl %eax,-28(%ebp) | |
| 147 | #else | |
| 148 | testb $128,-25(%ebp) | |
| 149 | je L_no_poly_round | |
| 150 | ||
| 151 | addl $1,-24(%ebp) | |
| 152 | adcl $0,-20(%ebp) | |
| 153 | L_no_poly_round: | |
| 154 | #endif EXTRA_PRECISE | |
| 155 | ||
| 156 | subl TERM_SIZE,%ecx | |
| 157 | jns L_accum_loop | |
| 158 | ||
| 159 | L_accum_done: | |
| 160 | #ifdef EXTRA_PRECISE | |
| 161 | /* And round the result */ | |
| 162 | testb $128,-25(%ebp) | |
| 163 | je L_poly_done | |
| 164 | ||
| 165 | addl $1,-24(%ebp) | |
| 166 | adcl $0,-20(%ebp) | |
| 167 | #endif EXTRA_PRECISE | |
| 168 | ||
| 169 | L_poly_done: | |
| 170 | movl -24(%ebp),%eax | |
| 171 | movl %eax,(%esi) | |
| 172 | movl -20(%ebp),%eax | |
| 173 | movl %eax,4(%esi) | |
| 174 | ||
| 175 | popl %ebx | |
| 176 | popl %edi | |
| 177 | popl %esi | |
| 178 | leave | |
| 179 | ret |