| /* Overridable constants and operations. |
| Copyright (C) 2013-2014 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 -= 1; \ |
| (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; \ |
| }) |
