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/* $OpenBSD: modsi3.S,v 1.1 2013/06/07 17:31:31 miod Exp $ */
/*
* Copyright (c) 2013 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <machine/asm.h>
/*
* int __modsi3(int n, int d);
*/
ENTRY(__modsi3)
/* if divider is zero, trap */
bcnd ne0, %r3, 1f
tb0 0, %r0, 503
1:
bb1 31, %r2, 1f
bb1 31, %r3, 2f
/* both operands are positive */
divu %r4, %r2, %r3
9:
mul %r5, %r4, %r3
jmp.n %r1
subu %r2, %r2, %r5
1:
bb1 31, %r3, 3f
/* r2 is negative, r3 is positive */
subu %r4, %r0, %r2
divu %r5, %r4, %r3
subu %r4, %r0, %r5
br 9b
2:
/* r2 is positive, r3 is negative */
subu %r5, %r0, %r3
divu %r4, %r2, %r5
subu %r4, %r0, %r4
br 9b
3:
/* both operands are negative */
subu %r4, %r0, %r2
subu %r5, %r0, %r3
divu %r4, %r4, %r5
br 9b
END(__modsi3)
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