1/* $OpenBSD: divsi3.S,v 1.4 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 __divsi3(int n, int d); 24 */ 25 26#ifndef LDSO 27.weak __divsi3 28#endif 29ENTRY(__divsi3) 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 jmp.n %r1 40 divu %r2, %r2, %r3 41 421: 43 bb1 31, %r3, 3f 44 45 /* r2 is negative, r3 is positive */ 46 subu %r4, %r0, %r2 47 divu %r5, %r4, %r3 48 jmp.n %r1 49 subu %r2, %r0, %r5 50 512: 52 /* r2 is positive, r3 is negative */ 53 subu %r5, %r0, %r3 54 divu %r4, %r2, %r5 55 jmp.n %r1 56 subu %r2, %r0, %r4 57 583: 59 /* both operands are negative */ 60 subu %r4, %r0, %r2 61 subu %r5, %r0, %r3 62 jmp.n %r1 63 divu %r2, %r4, %r5 64END(__divsi3) 65