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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/fmma.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/fmma.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/fmma.c b/Build/source/libs/mpfr/mpfr-src/src/fmma.c new file mode 100644 index 00000000000..6168c2af0f2 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/fmma.c @@ -0,0 +1,91 @@ +/* mpfr_fmma, mpfr_fmms -- Compute a*b +/- c*d + +Copyright 2014-2017 Free Software Foundation, Inc. +Contributed by the AriC and Caramba projects, INRIA. + +This file is part of the GNU MPFR Library. + +The GNU MPFR 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 3 of the License, or (at your +option) any later version. + +The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see +http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., +51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include "mpfr-impl.h" + +static int +mpfr_fmma_aux (mpfr_ptr z, mpfr_srcptr a, mpfr_srcptr b, mpfr_srcptr c, + mpfr_srcptr d, mpfr_rnd_t rnd, int neg) +{ + mpfr_ubf_t u, v; + mpfr_t zz; + mpfr_prec_t prec_z = MPFR_PREC(z); + mp_size_t un, vn; + mpfr_limb_ptr up, vp, zp; + int inex; + MPFR_TMP_DECL(marker); + + MPFR_LOG_FUNC + (("a[%Pu]=%.*Rg b[%Pu]=%.*Rg c[%Pu]=%.*Rg d[%Pu]=%.*Rg rnd=%d neg=%d", + mpfr_get_prec (a), mpfr_log_prec, a, + mpfr_get_prec (b), mpfr_log_prec, b, + mpfr_get_prec (c), mpfr_log_prec, c, + mpfr_get_prec (d), mpfr_log_prec, d, rnd, neg), + ("z[%Pu]=%.*Rg inex=%d", + mpfr_get_prec (z), mpfr_log_prec, z, inex)); + + MPFR_TMP_MARK (marker); + + un = MPFR_LIMB_SIZE (a) + MPFR_LIMB_SIZE (b); + vn = MPFR_LIMB_SIZE (c) + MPFR_LIMB_SIZE (d); + MPFR_TMP_INIT (up, u, (mpfr_prec_t) un * GMP_NUMB_BITS, un); + MPFR_TMP_INIT (vp, v, (mpfr_prec_t) vn * GMP_NUMB_BITS, vn); + + mpfr_ubf_mul_exact (u, a, b); + mpfr_ubf_mul_exact (v, c, d); + if (neg) + MPFR_CHANGE_SIGN (v); + if (prec_z == MPFR_PREC(a) && prec_z == MPFR_PREC(b) && + prec_z == MPFR_PREC(c) && prec_z == MPFR_PREC(d) && + un == MPFR_PREC2LIMBS(2 * prec_z)) + { + MPFR_TMP_INIT (zp, zz, 2 * prec_z, un); + MPFR_PREC(u) = MPFR_PREC(v) = 2 * prec_z; + inex = mpfr_add (zz, (mpfr_srcptr) u, (mpfr_srcptr) v, rnd); + inex = mpfr_set_1_2 (z, zz, rnd, inex); + } + else + inex = mpfr_add (z, (mpfr_srcptr) u, (mpfr_srcptr) v, rnd); + + MPFR_UBF_CLEAR_EXP (u); + MPFR_UBF_CLEAR_EXP (v); + + MPFR_TMP_FREE (marker); + + return inex; +} + +/* z <- a*b + c*d */ +int +mpfr_fmma (mpfr_ptr z, mpfr_srcptr a, mpfr_srcptr b, mpfr_srcptr c, + mpfr_srcptr d, mpfr_rnd_t rnd) +{ + return mpfr_fmma_aux (z, a, b, c, d, rnd, 0); +} + +/* z <- a*b - c*d */ +int +mpfr_fmms (mpfr_ptr z, mpfr_srcptr a, mpfr_srcptr b, mpfr_srcptr c, + mpfr_srcptr d, mpfr_rnd_t rnd) +{ + return mpfr_fmma_aux (z, a, b, c, d, rnd, 1); +} |