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/* Assembly support functions for libgcc1.
*
* Copyright (C) 1997 Free Software Foundation, Inc.
* Contributed by Cygnus Support
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* In addition to the permissions in the GNU General Public License, the
* Free Software Foundation gives you unlimited permission to link the
* compiled version of this file with other programs, and to distribute
* those programs without any restriction coming from the use of this
* file. (The General Public License restrictions do apply in other
* respects; for example, they cover modification of the file, and
* distribution when not linked into another program.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* As a special exception, if you link this library with files
* compiled with GCC to produce an executable, this does not cause
* the resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*/
#ifdef L_udivsi3
/* For division, we use the following algorithm:
*
* unsigned
* __divsi3 (unsigned a, unsigned b)
* {
* unsigned al = a;
* unsigned ah = 0;
* unsigned tmpf;
* int i;
*
* for (i = 32; i > 0; i--)
* {
* ah = (ah << 1) | (al >> 31);
* tmpf = (ah >= b) ? 1 : 0;
* ah -= ((tmpf) ? b : 0);
* al = (al << 1) | tmpf;
* }
*
* return al; // for __udivsi3
* return ah; // for __umodsi3
* }
*/
.file "_udivsi3"
.text
.globl __umodsi3
.globl __udivsi3
.type __umodsi3,@function
.type __udivsi3,@function
.stabs "libgcc1.asm",100,0,0,__umodsi3
.stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0
.stabs "__umodsi3:F(0,1)",36,0,1,__umodsi3
.stabs "a:P(0,1)",64,0,1,2
.stabs "b:P(0,1)",64,0,1,3
__umodsi3:
bra.s .Lmerge || orfg f1,f1,1 ; indicate this is __umodsi3
.Lumod:
.size __umodsi3,.Lumod-__umodsi3
.stabs "",36,0,0,.Lumod-__umodsi3
.stabs "__udivsi3:F(0,1)",36,0,1,__udivsi3
.stabs "a:P(0,1)",64,0,1,2
.stabs "b:P(0,1)",64,0,1,3
__udivsi3:
andfg f1,f1,0 || nop ; indicate this is __udivsi3
.Lmerge:
; r2 = al
; r3 = b
; r4 = ah
; r5 = loop counter
; f0 = tmpf
; f1 = 1 if this is mod, 0 if this is div
or r4,r0,0 || sub r5,r0,-32 ; ah = 0, loop = 32
.Lloop:
src r4,r2,-1 || sub r5,r5,1 ; ah = (ah << 1) | (al >> 31); decrement loop count
cmpuge f0,r4,r3 || sra r2,r2,-1 ; f0 = (ah >= b); al <<= 1
sub/tx r4,r4,r3 || or/tx r2,r2,1 ; ah -= (tmpf) ? b : 0; al |= tmpf
bratnz.s r5,.Lloop || nop ; loop back if not done
jmp link || or/xt r2,r0,r4 ; if mod, update register, then return to user
.Ludiv:
.size __udivsi3,.Ludiv-__udivsi3
.stabs "",36,0,0,.Ludiv-__udivsi3
#endif /* L_udivsi3 */
#ifdef L_divsi3
/* For division, we use the following algorithm:
*
* unsigned
* __divsi3 (unsigned a, unsigned b)
* {
* unsigned al = __builtin_abs (a);
* unsigned b2 = __builtin_abs (b);
* unsigned ah = 0;
* unsigned tmpf;
* int i;
*
* for (i = 32; i > 0; i--)
* {
* ah = (ah << 1) | (al >> 31);
* tmpf = (ah >= b2) ? 1 : 0;
* ah -= ((tmpf) ? b2 : 0);
* al = (al << 1) | tmpf;
* }
*
* if (a < 0)
* ah = -ah, al = -al;
*
* if (b < 0)
* al = -al;
*
* return al; // for __divsi3
* return ah; // for __modsi3
* }
*/
.file "_divsi3"
.text
.globl __modsi3
.globl __divsi3
.type __modsi3,@function
.type __divsi3,@function
.stabs "libgcc1.asm",100,0,0,__modsi3
.stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0
.stabs "__modsi3:F(0,1)",36,0,1,__modsi3
.stabs "a:P(0,1)",64,0,1,2
.stabs "b:P(0,1)",64,0,1,3
__modsi3:
bra.s .Lmerge || orfg f1,f1,1 ; indicate this is __modsi3
.Lmod:
.size __modsi3,.Lmod-__modsi3
.stabs "",36,0,0,.Lmod-__modsi3
.stabs "__divsi3:F(0,1)",36,0,1,__divsi3
.stabs "a:P(0,1)",64,0,1,2
.stabs "b:P(0,1)",64,0,1,3
__divsi3:
andfg f1,f1,0 || nop ; indicate this is __divsi3
.Lmerge:
; r2 = al
; r3 = b2
; r4 = ah
; r5 = loop counter
; r6 = a
; r7 = b
; f0 = tmpf
; f1 = 1 if this is mod, 0 if this is div
or r6,r0,r2 || or r7,r0,r3 ; copy original inputs
abs r2,r2 || abs r3,r3 ; make both postive
or r4,r0,0 || sub r5,r0,-32 ; ah = 0, loop = 32
.Lloop:
src r4,r2,-1 || sub r5,r5,1 ; ah = (ah << 1) | (al >> 31); decrement loop count
cmpuge f0,r4,r3 || sra r2,r2,-1 ; f0 = (ah >= b); al <<= 1
sub/tx r4,r4,r3 || or/tx r2,r2,1 ; ah -= (tmpf) ? b : 0; al |= tmpf
bratnz.s r5,.Lloop || nop ; loop back if not done
cmplt f0,r6,0 || nop ; f0 = (a < 0)
sub/tx r2,r0,r2 || sub/tx r4,r0,r4 ; negate both al, ah if (a < 0)
cmplt f0,r7,0 -> sub/tx r2,r0,r2 ; negate al if (b < 0)
jmp link || or/xt r2,r0,r4 ; update result if mod; return to user
.Ldiv:
.size __divsi3,.Ldiv-__divsi3
.stabs "",36,0,0,.Ldiv-__divsi3
#endif /* L_divsi3 */
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