mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* mpn_submul_1 -- multiply the S1_SIZE long limb vector pointed to by S1_PTR
|
|
by S2_LIMB, subtract the S1_SIZE least significant limbs of the product
|
|
from the limb vector pointed to by RES_PTR. Return the most significant
|
|
limb of the product, adjusted for carry-out from the subtraction.
|
|
|
|
Copyright (C) 1992-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP Library 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 Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <gmp.h>
|
|
#include "gmp-impl.h"
|
|
#include "longlong.h"
|
|
|
|
mp_limb_t
|
|
mpn_submul_1 (register mp_ptr res_ptr, register mp_srcptr s1_ptr,
|
|
mp_size_t s1_size, register mp_limb_t s2_limb)
|
|
{
|
|
register mp_limb_t cy_limb;
|
|
register mp_size_t j;
|
|
register mp_limb_t prod_high, prod_low;
|
|
register mp_limb_t x;
|
|
|
|
/* The loop counter and index J goes from -SIZE to -1. This way
|
|
the loop becomes faster. */
|
|
j = -s1_size;
|
|
|
|
/* Offset the base pointers to compensate for the negative indices. */
|
|
res_ptr -= j;
|
|
s1_ptr -= j;
|
|
|
|
cy_limb = 0;
|
|
do
|
|
{
|
|
umul_ppmm (prod_high, prod_low, s1_ptr[j], s2_limb);
|
|
|
|
prod_low += cy_limb;
|
|
cy_limb = (prod_low < cy_limb) + prod_high;
|
|
|
|
x = res_ptr[j];
|
|
prod_low = x - prod_low;
|
|
cy_limb += (prod_low > x);
|
|
res_ptr[j] = prod_low;
|
|
}
|
|
while (++j != 0);
|
|
|
|
return cy_limb;
|
|
}
|