[linux-2.6-block.git] / arch / blackfin / lib / modsi3.S

/*
 * This program computes 32 bit signed remainder. It calls div32 function
 * for quotient estimation.
 *   Registers in:  R0, R1 = Numerator/ Denominator
 *   Registers out: R0     = Remainder
 *
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the ADI BSD license or the GPL-2 (or later)
 */

.global ___modsi3;
.type ___modsi3, STT_FUNC;
.extern ___divsi3;
.type ___divsi3, STT_FUNC;

#ifdef CONFIG_ARITHMETIC_OPS_L1
.section .l1.text
#else
.text
#endif

___modsi3:

	CC=R0==0;
	IF CC JUMP .LRETURN_R0;		/* Return 0, if numerator  == 0 */
	CC=R1==0;
	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == 0 */
	CC=R0==R1;
	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if numerator == denominator */
	CC = R1 == 1;
	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator ==  1 */
	CC = R1 == -1;
	IF CC JUMP .LRETURN_ZERO;		/* Return 0, if denominator == -1 */

	/* Valid input. Use __divsi3() to compute the quotient, and then
	 * derive the remainder from that. */

	[--SP] = (R7:6);		/* Push  R7 and R6 */
	[--SP] = RETS;			/* and return address */
	R7 = R0;			/* Copy of R0 */
	R6 = R1;			/* Save for later */
	SP += -12;			/* Should always provide this space */
	CALL ___divsi3;			/* Compute signed quotient using ___divsi3()*/
	SP += 12;
	R0 *= R6;			/* Quotient * divisor */
	R0 = R7 - R0;			/* Dividend - (quotient * divisor) */
	RETS = [SP++];			/* Get back return address */
	(R7:6) = [SP++];		/* Pop registers R7 and R4 */
	RTS;				/* Store remainder    */

.LRETURN_ZERO:
	R0 = 0;
.LRETURN_R0:
	RTS;

.size ___modsi3, .-___modsi3
Commit	Line	Data
1394f032	1	/*
96f1050d RG	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
1394f032	6	*
96f1050d	7	* Copyright 2004-2009 Analog Devices Inc.
1394f032	8	*
96f1050d	9	* Licensed under the ADI BSD license or the GPL-2 (or later)
1394f032 BW	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;
51be24c3 MF	56
51be24c3 MF	57	.size ___modsi3, .-___modsi3