projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f24c459c JH |
1 | /* |
| 2 | * poly_mul64.S | |
| 3 | * | |
| 4 | * Multiply two 64 bit integers. | |
| 5 | * | |
| 6 | * Call from C as: | |
| 7 | * void mul64(long long *a, long long *b, long long *result) | |
| 8 | * | |
| 9 | * | |
| 10 | * Copyright (C) 1992, 1993 W. Metzenthen, 22 Parker St, Ormond, | |
| 11 | * Vic 3163, Australia. | |
| 12 | * E-mail apm233m@vaxc.cc.monash.edu.au | |
| 13 | * All rights reserved. | |
| 14 | * | |
| 15 | * This copyright notice covers the redistribution and use of the | |
| 16 | * FPU emulator developed by W. Metzenthen. It covers only its use | |
| 17 | * in the 386BSD operating system. Any other use is not permitted | |
| 18 | * under this copyright. | |
| 19 | * | |
| 20 | * Redistribution and use in source and binary forms, with or without | |
| 21 | * modification, are permitted provided that the following conditions | |
| 22 | * are met: | |
| 23 | * 1. Redistributions of source code must retain the above copyright | |
| 24 | * notice, this list of conditions and the following disclaimer. | |
| 25 | * 2. Redistributions in binary form must include information specifying | |
| 26 | * that source code for the emulator is freely available and include | |
| 27 | * either: | |
| 28 | * a) an offer to provide the source code for a nominal distribution | |
| 29 | * fee, or | |
| 30 | * b) list at least two alternative methods whereby the source | |
| 31 | * can be obtained, e.g. a publically accessible bulletin board | |
| 32 | * and an anonymous ftp site from which the software can be | |
| 33 | * downloaded. | |
| 34 | * 3. All advertising materials specifically mentioning features or use of | |
| 35 | * this emulator must acknowledge that it was developed by W. Metzenthen. | |
| 36 | * 4. The name of W. Metzenthen may not be used to endorse or promote | |
| 37 | * products derived from this software without specific prior written | |
| 38 | * permission. | |
| 39 | * | |
| 40 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 41 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
| 42 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | |
| 43 | * W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 44 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 45 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 46 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 47 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 48 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 49 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 50 | * | |
| 51 | */ | |
| 52 | ||
| 53 | ||
| 54 | #include "fpu_asm.h" | |
| 55 | ||
| 56 | .text | |
| 57 | .align 2,144 | |
| 58 | .globl _mul64 | |
| 59 | _mul64: | |
| 60 | pushl %ebp | |
| 61 | movl %esp,%ebp | |
| 62 | subl $16,%esp | |
| 63 | pushl %esi | |
| 64 | pushl %ebx | |
| 65 | ||
| 66 | movl PARAM1,%esi | |
| 67 | movl PARAM2,%ecx | |
| 68 | movl PARAM3,%ebx | |
| 69 | ||
| 70 | xor %eax,%eax | |
| 71 | movl %eax,-4(%ebp) | |
| 72 | movl %eax,-8(%ebp) | |
| 73 | ||
| 74 | movl (%esi),%eax | |
| 75 | mull (%ecx) | |
| 76 | movl %eax,-16(%ebp) /* Not used */ | |
| 77 | movl %edx,-12(%ebp) | |
| 78 | ||
| 79 | movl (%esi),%eax | |
| 80 | mull 4(%ecx) | |
| 81 | addl %eax,-12(%ebp) | |
| 82 | adcl %edx,-8(%ebp) | |
| 83 | adcl $0,-4(%ebp) | |
| 84 | ||
| 85 | movl 4(%esi),%eax | |
| 86 | mull (%ecx) | |
| 87 | addl %eax,-12(%ebp) | |
| 88 | adcl %edx,-8(%ebp) | |
| 89 | adcl $0,-4(%ebp) | |
| 90 | ||
| 91 | movl 4(%esi),%eax | |
| 92 | mull 4(%ecx) | |
| 93 | addl %eax,-8(%ebp) | |
| 94 | adcl %edx,-4(%ebp) | |
| 95 | ||
| 96 | testb $128,-9(%ebp) | |
| 97 | je L_no_round | |
| 98 | ||
| 99 | addl $1,-8(%ebp) | |
| 100 | adcl $0,-4(%ebp) | |
| 101 | ||
| 102 | L_no_round: | |
| 103 | movl -8(%ebp),%esi | |
| 104 | movl %esi,(%ebx) | |
| 105 | movl -4(%ebp),%esi | |
| 106 | movl %esi,4(%ebx) | |
| 107 | ||
| 108 | popl %ebx | |
| 109 | popl %esi | |
| 110 | leave | |
| 111 | ret |