267 lines
4.5 KiB
NASM
267 lines
4.5 KiB
NASM
; libgcc routines for ARC cpu.
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/* Copyright (C) 1995, 1997,2004, 2009 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef L_mulsi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___mulsi3
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___mulsi3:
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/* This the simple version.
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while (a)
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{
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if (a & 1)
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r += b;
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a >>= 1;
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b <<= 1;
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}
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*/
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mov r2,0 ; Accumulate result here.
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.Lloop:
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sub.f 0,r0,0 ; while (a)
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nop
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beq.nd .Ldone
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and.f 0,r0,1 ; if (a & 1)
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add.nz r2,r2,r1 ; r += b
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lsr r0,r0 ; a >>= 1
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b.d .Lloop
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lsl r1,r1 ; b <<= 1
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.Ldone:
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j.d blink
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mov r0,r2
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#endif
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#endif /* L_mulsi3 */
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#ifdef L_umulsidi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___umulsidi3
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___umulsidi3:
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/* This the simple version.
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while (a)
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{
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if (a & 1)
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r += b;
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a >>= 1;
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b <<= 1;
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}
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*/
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mov r2,0 ; Top part of b.
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mov r3,0 ; Accumulate result here.
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mov r4,0
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.Lloop:
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sub.f 0,r0,0 ; while (a)
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nop
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beq.nd .Ldone
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and.f 0,r0,1 ; if (a & 1)
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sub.f 0,r0,0
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nop
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beq .Ldontadd
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add.f r4,r4,r1 ; r += b
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adc r3,r3,r2
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.Ldontadd:
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lsr r0,r0 ; a >>= 1
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lsl.f r1,r1 ; b <<= 1
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b.d .Lloop
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rlc r2,r2
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.Ldone:
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#ifdef __big_endian__
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mov r1,r4
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j.d blink
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mov r0,r3
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#else
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mov r0,r4
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j.d blink
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mov r1,r3
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#endif
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#endif
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#endif /* L_umulsidi3 */
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#ifdef L_divmod_tools
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; Utilities used by all routines.
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.section .text
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.align 4
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; inputs: r0 = numerator, r1 = denominator
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; outputs: positive r0/r1,
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; r6.bit1 = sign of numerator, r6.bit0 = sign of result
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.global ___divnorm
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___divnorm:
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mov r6,0 ; keep sign in r6
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sub.f 0,r0,0 ; is numerator -ve?
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sub.lt r0,0,r0 ; negate numerator
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mov.lt r6,3 ; sign is -ve
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sub.f 0,r1,0 ; is denominator -ve?
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sub.lt r1,0,r1 ; negate denominator
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xor.lt r6,r6,1 ; toggle sign
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j.nd blink
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/*
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unsigned long
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udivmodsi4(int modwanted, unsigned long num, unsigned long den)
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{
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unsigned long bit = 1;
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unsigned long res = 0;
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while (den < num && bit && !(den & (1L<<31)))
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{
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den <<=1;
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bit <<=1;
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}
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while (bit)
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{
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if (num >= den)
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{
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num -= den;
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res |= bit;
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}
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bit >>=1;
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den >>=1;
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}
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if (modwanted) return num;
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return res;
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}
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*/
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; inputs: r0 = numerator, r1 = denominator
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; outputs: r0 = quotient, r1 = remainder, r2/r3 trashed
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.global ___udivmodsi4
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___udivmodsi4:
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mov r2,1 ; bit = 1
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mov r3,0 ; res = 0
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.Lloop1:
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sub.f 0,r1,r0 ; while (den < num
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nop
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bnc.nd .Lloop2
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sub.f 0,r2,0 ; && bit
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nop
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bz.nd .Lloop2
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lsl.f 0,r1 ; && !(den & (1<<31))
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nop
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bc.nd .Lloop2
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lsl r1,r1 ; den <<= 1
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b.d .Lloop1
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lsl r2,r2 ; bit <<= 1
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.Lloop2:
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sub.f 0,r2,0 ; while (bit)
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nop
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bz.nd .Ldivmodend
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sub.f 0,r0,r1 ; if (num >= den)
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nop
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bc.nd .Lshiftdown
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sub r0,r0,r1 ; num -= den
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or r3,r3,r2 ; res |= bit
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.Lshiftdown:
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lsr r2,r2 ; bit >>= 1
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b.d .Lloop2
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lsr r1,r1 ; den >>= 1
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.Ldivmodend:
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mov r1,r0 ; r1 = mod
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j.d blink
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mov r0,r3 ; r0 = res
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#endif
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#ifdef L_udivsi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___udivsi3
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___udivsi3:
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mov r7,blink
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bl.nd ___udivmodsi4
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j.nd r7
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#endif
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#endif /* L_udivsi3 */
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#ifdef L_divsi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___divsi3
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___divsi3:
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mov r7,blink
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bl.nd ___divnorm
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bl.nd ___udivmodsi4
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and.f 0,r6,1
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sub.nz r0,0,r0 ; cannot go in delay slot, has limm value
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j.nd r7
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#endif
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#endif /* L_divsi3 */
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#ifdef L_umodsi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___umodsi3
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___umodsi3:
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mov r7,blink
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bl.nd ___udivmodsi4
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j.d r7
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mov r0,r1
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#endif
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#endif /* L_umodsi3 */
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#ifdef L_modsi3
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.section .text
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.align 4
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#ifdef __base__
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.cpu base
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.global ___modsi3
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___modsi3:
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mov r7,blink
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bl.nd ___divnorm
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bl.nd ___udivmodsi4
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and.f 0,r6,2
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sub.nz r1,0,r1
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j.d r7
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mov r0,r1
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#endif
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#endif /* L_modsi3 */
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