1/*
2 * This program computes 32 bit signed remainder. It calls div32 function
3 * for quotient estimation.
4 *   Registers in:  R0, R1 = Numerator/ Denominator
5 *   Registers out: R0     = Remainder
6 *
7 * Copyright 2004-2009 Analog Devices Inc.
8 *
9 * Licensed under the Clear BSD license or the GPL-2 (or later)
10 */
11
12.global ___modsi3;
13.type ___modsi3, STT_FUNC;
14.extern ___divsi3;
15.type ___divsi3, STT_FUNC;
16
17#ifdef CONFIG_ARITHMETIC_OPS_L1
18.section .l1.text
19#else
20.text
21#endif
22
23___modsi3:
24
25	CC=R0==0;
26	IF CC JUMP .LRETURN_R0;		/* Return 0, if numerator  == 0 */
27	CC=R1==0;
28	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == 0 */
29	CC=R0==R1;
30	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if numerator == denominator */
31	CC = R1 == 1;
32	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator ==  1 */
33	CC = R1 == -1;
34	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == -1 */
35
36	/* Valid input. Use __divsi3() to compute the quotient, and then
37	 * derive the remainder from that. */
38
39	[--SP] = (R7:6);		/* Push  R7 and R6 */
40	[--SP] = RETS;			/* and return address */
41	R7 = R0;			/* Copy of R0 */
42	R6 = R1;			/* Save for later */
43	SP += -12;			/* Should always provide this space */
44	CALL ___divsi3;			/* Compute signed quotient using ___divsi3()*/
45	SP += 12;
46	R0 *= R6;			/* Quotient * divisor */
47	R0 = R7 - R0;			/* Dividend - (quotient * divisor) */
48	RETS = [SP++];			/* Get back return address */
49	(R7:6) = [SP++];		/* Pop registers R7 and R4 */
50	RTS;				/* Store remainder    */
51
52.LRETURN_ZERO:
53	R0 = 0;
54.LRETURN_R0:
55	RTS;
56
57.size ___modsi3, .-___modsi3
58