1/* $OpenBSD: modsi3.S,v 1.3 2022/12/06 18:50:59 guenther Exp $ */ 2 3/* 4 * Copyright (c) 2013 Miodrag Vallat. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 20#include "SYS.h" 21 22/* 23 * int __modsi3(int n, int d); 24 */ 25 26#ifndef LDSO 27.weak __modsi3 28#endif 29ENTRY(__modsi3) 30 /* if divider is zero, trap */ 31 bcnd ne0, %r3, 1f 32 tb0 0, %r0, 503 331: 34 35 bb1 31, %r2, 1f 36 bb1 31, %r3, 2f 37 38 /* both operands are positive */ 39 divu %r4, %r2, %r3 409: 41 mul %r5, %r4, %r3 42 jmp.n %r1 43 subu %r2, %r2, %r5 44 451: 46 bb1 31, %r3, 3f 47 48 /* r2 is negative, r3 is positive */ 49 subu %r4, %r0, %r2 50 divu %r5, %r4, %r3 51 subu %r4, %r0, %r5 52 br 9b 53 542: 55 /* r2 is positive, r3 is negative */ 56 subu %r5, %r0, %r3 57 divu %r4, %r2, %r5 58 subu %r4, %r0, %r4 59 br 9b 60 613: 62 /* both operands are negative */ 63 subu %r4, %r0, %r2 64 subu %r5, %r0, %r3 65 divu %r4, %r4, %r5 66 br 9b 67END(__modsi3) 68