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/*
* Copyright (c) 2013, Andreas Sandberg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _FPBITS_H
#define _FPBITS_H
#include <stdint.h>
#define FP80_FRAC_BITS 63
#define FP80_INT_BIT 0x8000000000000000ULL
#define FP80_QNAN_BIT 0x4000000000000000ULL
#define FP80_FRAC_MASK 0x7fffffffffffffffULL
#define FP80_EXP_MASK 0x7fff
#define FP80_SIGN_BIT 0x8000
#define FP80_EXP_BIAS 0x3fff
#define FP80_EXP_SPECIAL 0x7fff
#define FP80_FRAC_SNAN 0x3fffffffffffffffULL
#define FP80_FRAC_QNAN 0x7fffffffffffffffULL
#define FP80_FRAC_QNANI 0x4000000000000000ULL
#define FP64_EXP_SHIFT 52
#define FP64_FRAC_BITS 52
#define FP64_SIGN_BIT 0x8000000000000000ULL
#define FP64_EXP_MASK 0x7ff0000000000000ULL
#define FP64_FRAC_MASK 0x000fffffffffffffULL
#define FP64_EXP_BIAS 0x3ff
#define FP64_EXP_SPECIAL 0x7ff
#define FP64_FRAC_SNAN 0x0007ffffffffffffULL
#define FP64_FRAC_QNAN 0x000fffffffffffffULL
#define FP64_FRAC_QNANI 0x0008000000000000ULL
#define BUILD_IFP64(sign, frac, exp) \
((sign) ? FP64_SIGN_BIT : 0) | \
(((uint64_t)(exp) << FP64_EXP_SHIFT) & FP64_EXP_MASK) | \
((frac) & FP64_FRAC_MASK)
#define BUILD_FP64(sign, frac, exp) \
{ .bits = BUILD_IFP64(sign, frac, exp) }
static inline fp64_t
build_fp64(int sign, uint64_t frac, int exp)
{
const fp64_t f = BUILD_FP64(sign, frac, exp);
return f;
}
#define BUILD_FP80_SE(sign, exp) \
((sign) ? FP80_SIGN_BIT : 0) | \
((exp) & FP80_EXP_MASK)
#define BUILD_FP80_FI(frac, exp) \
((exp) ? FP80_INT_BIT : 0) | \
((frac) & FP80_FRAC_MASK)
#define BUILD_FP80(sign, frac, exp) \
{ \
.repr.pad = { 0 }, \
.repr.se = BUILD_FP80_SE(sign, exp), \
.repr.fi = BUILD_FP80_FI(frac, exp) \
}
static inline fp80_t
build_fp80(int sign, uint64_t frac, int exp)
{
const fp80_t f = BUILD_FP80(sign, frac, exp);
return f;
}
#define FP80_FRAC(fp80) \
(fp80.repr.fi & FP80_FRAC_MASK)
#define FP80_EXP(fp80) \
(fp80.repr.se & FP80_EXP_MASK)
#define FP64_FRAC(fp64) \
(fp64.bits & FP64_FRAC_MASK)
#define FP64_EXP(fp80) \
((fp64.bits & FP64_EXP_MASK) >> FP64_EXP_SHIFT)
#endif
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