vasilito
ff4ff35918
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/* Cray PVP/IEEE mpn_mul_basecase.
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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/* The most critical loop of this code runs at about 5 cycles/limb on a T90.
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That is not perfect, mainly due to vector register shortage. */
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#include <intrinsics.h>
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#include "gmp-impl.h"
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void
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mpn_mul_basecase (mp_ptr rp,
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mp_srcptr up, mp_size_t un,
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mp_srcptr vp, mp_size_t vn)
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{
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mp_limb_t cy[un + vn];
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mp_limb_t vl;
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mp_limb_t a, b, r, s0, s1, c0, c1;
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mp_size_t i, j;
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int more_carries;
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for (i = 0; i < un + vn; i++)
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{
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rp[i] = 0;
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cy[i] = 0;
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}
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#pragma _CRI novector
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for (j = 0; j < vn; j++)
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{
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vl = vp[j];
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a = up[0] * vl;
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r = rp[j];
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s0 = a + r;
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rp[j] = s0;
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c0 = ((a & r) | ((a | r) & ~s0)) >> 63;
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cy[j] += c0;
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#pragma _CRI ivdep
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for (i = 1; i < un; i++)
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{
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a = up[i] * vl;
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b = _int_mult_upper (up[i - 1], vl);
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s0 = a + b;
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c0 = ((a & b) | ((a | b) & ~s0)) >> 63;
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r = rp[j + i];
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s1 = s0 + r;
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rp[j + i] = s1;
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c1 = ((s0 & r) | ((s0 | r) & ~s1)) >> 63;
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cy[j + i] += c0 + c1;
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}
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rp[j + un] = _int_mult_upper (up[un - 1], vl);
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}
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more_carries = 0;
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#pragma _CRI ivdep
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for (i = 1; i < un + vn; i++)
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{
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r = rp[i];
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c0 = cy[i - 1];
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s0 = r + c0;
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rp[i] = s0;
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c0 = (r & ~s0) >> 63;
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more_carries += c0;
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}
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/* If that second loop generated carry, handle that in scalar loop. */
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if (more_carries)
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{
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mp_limb_t cyrec = 0;
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for (i = 1; i < un + vn; i++)
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{
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r = rp[i];
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c0 = (r < cy[i - 1]);
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s0 = r + cyrec;
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rp[i] = s0;
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c1 = (r & ~s0) >> 63;
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cyrec = c0 | c1;
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}
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}
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}
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