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/* Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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 3 of the License, or (at your option)
any later version.
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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include <spu_intrinsics.h>
typedef unsigned int UTItype __attribute__ ((mode (TI)));
typedef int TItype __attribute__ ((mode (TI)));
TItype __divti3 (TItype u, TItype v);
TItype __modti3 (TItype u, TItype v);
UTItype __udivti3 (UTItype u, UTItype v);
UTItype __umodti3 (UTItype u, UTItype v);
UTItype __udivmodti4 (UTItype u, UTItype v, UTItype *w);
inline static unsigned int
count_leading_zeros (UTItype x)
{
qword c = si_clz (*(qword *) & x);
qword cmp0 = si_cgti (c, 31);
qword cmp1 = si_and (cmp0, si_shlqbyi (cmp0, 4));
qword cmp2 = si_and (cmp1, si_shlqbyi (cmp0, 8));
qword s = si_a (c, si_and (cmp0, si_shlqbyi (c, 4)));
s = si_a (s, si_and (cmp1, si_shlqbyi (c, 8)));
s = si_a (s, si_and (cmp2, si_shlqbyi (c, 12)));
return si_to_uint (s);
}
/* Based on implementation of udivmodsi4, which is essentially
* an optimized version of gcc/config/udivmodsi4.c
clz %7,%2
clz %4,%1
il %5,1
fsmbi %0,0
sf %7,%4,%7
ori %3,%1,0
shl %5,%5,%7
shl %4,%2,%7
1: or %8,%0,%5
rotmi %5,%5,-1
clgt %6,%4,%3
sf %7,%4,%3
rotmi %4,%4,-1
selb %0,%8,%0,%6
selb %3,%7,%3,%6
3: brnz %5,1b
*/
UTItype
__udivmodti4 (UTItype num, UTItype den, UTItype * rp)
{
qword shift =
si_from_uint (count_leading_zeros (den) - count_leading_zeros (num));
qword n0 = *(qword *) & num;
qword d0 = *(qword *) & den;
qword bit = si_andi (si_fsmbi (1), 1);
qword r0 = si_il (0);
qword m1 = si_fsmbi (0x000f);
qword mask, r1, n1;
d0 = si_shlqbybi (si_shlqbi (d0, shift), shift);
bit = si_shlqbybi (si_shlqbi (bit, shift), shift);
do
{
r1 = si_or (r0, bit);
// n1 = n0 - d0 in TImode
n1 = si_bg (d0, n0);
n1 = si_shlqbyi (n1, 4);
n1 = si_sf (m1, n1);
n1 = si_bgx (d0, n0, n1);
n1 = si_shlqbyi (n1, 4);
n1 = si_sf (m1, n1);
n1 = si_bgx (d0, n0, n1);
n1 = si_shlqbyi (n1, 4);
n1 = si_sf (m1, n1);
n1 = si_sfx (d0, n0, n1);
mask = si_fsm (si_cgti (n1, -1));
r0 = si_selb (r0, r1, mask);
n0 = si_selb (n0, n1, mask);
bit = si_rotqmbii (bit, -1);
d0 = si_rotqmbii (d0, -1);
}
while (si_to_uint (si_orx (bit)));
if (rp)
*rp = *(UTItype *) & n0;
return *(UTItype *) & r0;
}
UTItype
__udivti3 (UTItype n, UTItype d)
{
return __udivmodti4 (n, d, (UTItype *)0);
}
UTItype
__umodti3 (UTItype n, UTItype d)
{
UTItype w;
__udivmodti4 (n, d, &w);
return w;
}
TItype
__divti3 (TItype n, TItype d)
{
int c = 0;
TItype w;
if (n < 0)
{
c = ~c;
n = -n;
}
if (d < 0)
{
c = ~c;
d = -d;
}
w = __udivmodti4 (n, d, (UTItype *)0);
if (c)
w = -w;
return w;
}
TItype
__modti3 (TItype n, TItype d)
{
int c = 0;
TItype w;
if (n < 0)
{
c = ~c;
n = -n;
}
if (d < 0)
{
c = ~c;
d = -d;
}
__udivmodti4 (n, d, (UTItype *) &w);
if (c)
w = -w;
return w;
}
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