80 строки
2.4 KiB
ArmAsm
80 строки
2.4 KiB
ArmAsm
/*
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* File: arch/blackfin/lib/modsi3.S
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* Based on:
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* Author:
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*
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* Created:
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* Description: This program computes 32 bit signed remainder. It calls div32 function
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* for quotient estimation.
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*
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* Registers used :
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* Numerator/ Denominator in R0, R1
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* R0 - returns remainder.
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* R2-R7
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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.global ___modsi3;
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.type ___modsi3, STT_FUNC;
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.extern ___divsi3;
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.type ___divsi3, STT_FUNC;
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#ifdef CONFIG_ARITHMETIC_OPS_L1
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.section .l1.text
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#else
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.text
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#endif
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___modsi3:
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CC=R0==0;
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IF CC JUMP .LRETURN_R0; /* Return 0, if numerator == 0 */
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CC=R1==0;
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IF CC JUMP .LRETURN_ZERO; /* Return 0, if denominator == 0 */
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CC=R0==R1;
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IF CC JUMP .LRETURN_ZERO; /* Return 0, if numerator == denominator */
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CC = R1 == 1;
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IF CC JUMP .LRETURN_ZERO; /* Return 0, if denominator == 1 */
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CC = R1 == -1;
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IF CC JUMP .LRETURN_ZERO; /* Return 0, if denominator == -1 */
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/* Valid input. Use __divsi3() to compute the quotient, and then
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* derive the remainder from that. */
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[--SP] = (R7:6); /* Push R7 and R6 */
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[--SP] = RETS; /* and return address */
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R7 = R0; /* Copy of R0 */
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R6 = R1; /* Save for later */
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SP += -12; /* Should always provide this space */
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CALL ___divsi3; /* Compute signed quotient using ___divsi3()*/
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SP += 12;
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R0 *= R6; /* Quotient * divisor */
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R0 = R7 - R0; /* Dividend - (quotient * divisor) */
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RETS = [SP++]; /* Get back return address */
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(R7:6) = [SP++]; /* Pop registers R7 and R4 */
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RTS; /* Store remainder */
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.LRETURN_ZERO:
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R0 = 0;
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.LRETURN_R0:
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RTS;
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