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57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/* Overridable constants and operations.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This program 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
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public 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 this program; if not, see <http://www.gnu.org/licenses/>. */
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typedef double mantissa_t;
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typedef double mantissa_store_t;
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#define TWOPOW(i) (0x1.0p##i)
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#define RADIX TWOPOW (24) /* 2^24 */
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#define CUTTER TWOPOW (76) /* 2^76 */
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#define RADIXI 0x1.0p-24 /* 2^-24 */
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#define TWO52 TWOPOW (52) /* 2^52 */
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/* Divide D by RADIX and put the remainder in R. */
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#define DIV_RADIX(d,r) \
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({ \
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double u = ((d) + CUTTER) - CUTTER; \
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if (u > (d)) \
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u -= RADIX; \
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r = (d) - u; \
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(d) = u * RADIXI; \
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})
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/* Put the integer component of a double X in R and retain the fraction in
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X. */
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#define INTEGER_OF(x, r) \
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({ \
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double u = ((x) + TWO52) - TWO52; \
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if (u > (x)) \
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u -= 1; \
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(r) = u; \
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(x) -= u; \
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})
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/* Align IN down to a multiple of F, where F is a power of two. */
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#define ALIGN_DOWN_TO(in, f) \
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({ \
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double factor = f * TWO52; \
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double u = (in + factor) - factor; \
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if (u > in) \
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u -= f; \
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u; \
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})
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