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 ADI 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