1/* $OpenBSD: modsi3.S,v 1.1 2013/06/07 17:31:31 miod 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 <machine/asm.h> 21 22/* 23 * int __modsi3(int n, int d); 24 */ 25 26ENTRY(__modsi3) 27 /* if divider is zero, trap */ 28 bcnd ne0, %r3, 1f 29 tb0 0, %r0, 503 301: 31 32 bb1 31, %r2, 1f 33 bb1 31, %r3, 2f 34 35 /* both operands are positive */ 36 divu %r4, %r2, %r3 379: 38 mul %r5, %r4, %r3 39 jmp.n %r1 40 subu %r2, %r2, %r5 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 subu %r4, %r0, %r5 49 br 9b 50 512: 52 /* r2 is positive, r3 is negative */ 53 subu %r5, %r0, %r3 54 divu %r4, %r2, %r5 55 subu %r4, %r0, %r4 56 br 9b 57 583: 59 /* both operands are negative */ 60 subu %r4, %r0, %r2 61 subu %r5, %r0, %r3 62 divu %r4, %r4, %r5 63 br 9b 64END(__modsi3) 65