a855debfb4
* libquadmath.texi (FLT128_DIG, FLT128_MIN_10_EXP, FLT128_MAX_10_EXP): Document. (strtoflt128): Remove obsolete comment. * configure.ac (HAVE_STRTOULL): New check. * printf/gmp-impl.h (mpn_construct_float128): New prototype, define. * printf/mul_n.c: Include <config.h>. * printf/add_n.c: Likewise. * printf/cmp.c: Likewise. * printf/fpioconst.c: Likewise. * printf/mul_1.c: Likewise. * printf/rshift.c: Likewise. * printf/lshift.c: Likewise. * printf/submul_1.c: Likewise. * printf/sub_n.c: Likewise. * printf/divrem.c: Likewise. * printf/addmul_1.c: Likewise. * printf/mul.c: Likewise. * printf/quadmath-printf.h (isupper, isdigit, tolower): Change to avoid evaluating argument multiple times. (isxdigit): Redefine. * strtod/strtoflt128.c: New file. * strtod/strtod_l.c: New file. * strtod/mpn2flt128.c: New file. * strtod/grouping.h: New file. * strtod/tens_in_limb.c: New file. * gdtoa/arith.h: Removed. * gdtoa/gd_qnan.h: Removed. * gdtoa/gdtoa_fltrnds.h: Removed. * gdtoa/gdtoa.h: Removed. * gdtoa/gdtoaimp.h: Removed. * gdtoa/gethex.c: Removed. * gdtoa/gmisc.c: Removed. * gdtoa/hd_init.c: Removed. * gdtoa/hexnan.c: Removed. * gdtoa/makefile: Removed. * gdtoa/misc.c: Removed. * gdtoa/README.gdtoa: Removed. * gdtoa/smisc.c: Removed. * gdtoa/strtodg.c: Removed. * gdtoa/strtopQ.c: Removed. * gdtoa/sum.c: Removed. * quadmath.h (FLT128_DIG, FLT128_MIN_10_EXP, FLT128_MAX_10_EXP): Define. * Makefile.am (libquadmath_la_SOURCES): Remove gdtoa/*, add strtod/strtoflt128.c, strtod/mpn2flt128.c and strtod/tens_in_limb.c. * config.h.in: Regenerated. * configure: Regenerated. * Makefile.in: Regenerated. From-SVN: r170254
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* mpn_sub_n -- Subtract two limb vectors of equal, non-zero length.
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Copyright (C) 1992, 1993, 1994, 1996 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 the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <config.h>
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#include "gmp-impl.h"
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mp_limb_t
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#if __STDC__
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mpn_sub_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size)
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#else
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mpn_sub_n (res_ptr, s1_ptr, s2_ptr, size)
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register mp_ptr res_ptr;
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register mp_srcptr s1_ptr;
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register mp_srcptr s2_ptr;
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mp_size_t size;
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#endif
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{
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register mp_limb_t x, y, cy;
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register mp_size_t j;
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/* The loop counter and index J goes from -SIZE to -1. This way
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the loop becomes faster. */
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j = -size;
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/* Offset the base pointers to compensate for the negative indices. */
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s1_ptr -= j;
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s2_ptr -= j;
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res_ptr -= j;
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cy = 0;
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do
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{
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y = s2_ptr[j];
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x = s1_ptr[j];
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y += cy; /* add previous carry to subtrahend */
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cy = (y < cy); /* get out carry from that addition */
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y = x - y; /* main subtract */
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cy = (y > x) + cy; /* get out carry from the subtract, combine */
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res_ptr[j] = y;
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}
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while (++j != 0);
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return cy;
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}
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