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/* Overridable constants and operations.
Copyright (C) 2013 Free Software Foundation, Inc.
This program 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.
This program 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 this program; if not, see <http://www.gnu.org/licenses/>. */
typedef double mantissa_t;
typedef double mantissa_store_t;
#define TWOPOW(i) (0x1.0p##i)
#define RADIX TWOPOW (24) /* 2^24 */
#define CUTTER TWOPOW (76) /* 2^76 */
#define RADIXI 0x1.0p-24 /* 2^-24 */
#define TWO52 TWOPOW (52) /* 2^52 */
/* Divide D by RADIX and put the remainder in R. */
#define DIV_RADIX(d,r) \
({ \
double u = ((d) + CUTTER) - CUTTER; \
if (u > (d)) \
u -= RADIX; \
r = (d) - u; \
(d) = u * RADIXI; \
})
/* Put the integer component of a double X in R and retain the fraction in
X. */
#define INTEGER_OF(x, r) \
({ \
double u = ((x) + TWO52) - TWO52; \
if (u > (x)) \
u -= ONE; \
(r) = u; \
(x) -= u; \
})
/* Align IN down to a multiple of F, where F is a power of two. */
#define ALIGN_DOWN_TO(in, f) \
({ \
double factor = f * TWO52; \
double u = (in + factor) - factor; \
if (u > in) \
u -= f; \
u; \
})
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