58 строки
1.5 KiB
ArmAsm
58 строки
1.5 KiB
ArmAsm
/*
|
|
* 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
|