2018-01-19 17:36:40 +01:00
|
|
|
/*
|
|
|
|
* QEMU float support
|
|
|
|
*
|
|
|
|
* The code in this source file is derived from release 2a of the SoftFloat
|
|
|
|
* IEC/IEEE Floating-point Arithmetic Package. Those parts of the code (and
|
|
|
|
* some later contributions) are provided under that license, as detailed below.
|
|
|
|
* It has subsequently been modified by contributors to the QEMU Project,
|
|
|
|
* so some portions are provided under:
|
|
|
|
* the SoftFloat-2a license
|
|
|
|
* the BSD license
|
|
|
|
* GPL-v2-or-later
|
|
|
|
*
|
|
|
|
* This header holds definitions for code that might be dealing with
|
|
|
|
* softfloat types but not need access to the actual library functions.
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
===============================================================================
|
|
|
|
This C header file is part of the SoftFloat IEC/IEEE Floating-point
|
|
|
|
Arithmetic Package, Release 2a.
|
|
|
|
|
|
|
|
Written by John R. Hauser. This work was made possible in part by the
|
|
|
|
International Computer Science Institute, located at Suite 600, 1947 Center
|
|
|
|
Street, Berkeley, California 94704. Funding was partially provided by the
|
|
|
|
National Science Foundation under grant MIP-9311980. The original version
|
|
|
|
of this code was written as part of a project to build a fixed-point vector
|
|
|
|
processor in collaboration with the University of California at Berkeley,
|
|
|
|
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
|
|
|
is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
|
|
|
arithmetic/SoftFloat.html'.
|
|
|
|
|
|
|
|
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
|
|
|
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
|
|
|
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
|
|
|
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
|
|
|
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
|
|
|
|
|
|
|
Derivative works are acceptable, even for commercial purposes, so long as
|
|
|
|
(1) they include prominent notice that the work is derivative, and (2) they
|
|
|
|
include prominent notice akin to these four paragraphs for those parts of
|
|
|
|
this code that are retained.
|
|
|
|
|
|
|
|
===============================================================================
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* BSD licensing:
|
|
|
|
* Copyright (c) 2006, Fabrice Bellard
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* 3. Neither the name of the copyright holder nor the names of its contributors
|
|
|
|
* may be used to endorse or promote products derived from this software without
|
|
|
|
* specific prior written permission.
|
|
|
|
*
|
|
|
|
* 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 HOLDER 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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Portions of this work are licensed under the terms of the GNU GPL,
|
|
|
|
* version 2 or later. See the COPYING file in the top-level directory.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef SOFTFLOAT_TYPES_H
|
|
|
|
#define SOFTFLOAT_TYPES_H
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Software IEC/IEEE floating-point types.
|
|
|
|
*/
|
|
|
|
|
|
|
|
typedef uint16_t float16;
|
|
|
|
typedef uint32_t float32;
|
|
|
|
typedef uint64_t float64;
|
|
|
|
#define float16_val(x) (x)
|
|
|
|
#define float32_val(x) (x)
|
|
|
|
#define float64_val(x) (x)
|
|
|
|
#define make_float16(x) (x)
|
|
|
|
#define make_float32(x) (x)
|
|
|
|
#define make_float64(x) (x)
|
|
|
|
#define const_float16(x) (x)
|
|
|
|
#define const_float32(x) (x)
|
|
|
|
#define const_float64(x) (x)
|
|
|
|
typedef struct {
|
|
|
|
uint64_t low;
|
|
|
|
uint16_t high;
|
|
|
|
} floatx80;
|
|
|
|
#define make_floatx80(exp, mant) ((floatx80) { mant, exp })
|
|
|
|
#define make_floatx80_init(exp, mant) { .low = mant, .high = exp }
|
|
|
|
typedef struct {
|
|
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
|
|
uint64_t high, low;
|
|
|
|
#else
|
|
|
|
uint64_t low, high;
|
|
|
|
#endif
|
|
|
|
} float128;
|
|
|
|
#define make_float128(high_, low_) ((float128) { .high = high_, .low = low_ })
|
|
|
|
#define make_float128_init(high_, low_) { .high = high_, .low = low_ }
|
|
|
|
|
2018-01-19 19:24:22 +01:00
|
|
|
/*
|
|
|
|
* Software IEC/IEEE floating-point underflow tininess-detection mode.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum {
|
|
|
|
float_tininess_after_rounding = 0,
|
|
|
|
float_tininess_before_rounding = 1
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
*Software IEC/IEEE floating-point rounding mode.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum {
|
|
|
|
float_round_nearest_even = 0,
|
|
|
|
float_round_down = 1,
|
|
|
|
float_round_up = 2,
|
|
|
|
float_round_to_zero = 3,
|
|
|
|
float_round_ties_away = 4,
|
|
|
|
/* Not an IEEE rounding mode: round to the closest odd mantissa value */
|
|
|
|
float_round_to_odd = 5,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Software IEC/IEEE floating-point exception flags.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum {
|
|
|
|
float_flag_invalid = 1,
|
|
|
|
float_flag_divbyzero = 4,
|
|
|
|
float_flag_overflow = 8,
|
|
|
|
float_flag_underflow = 16,
|
|
|
|
float_flag_inexact = 32,
|
|
|
|
float_flag_input_denormal = 64,
|
|
|
|
float_flag_output_denormal = 128
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Floating Point Status. Individual architectures may maintain
|
|
|
|
* several versions of float_status for different functions. The
|
|
|
|
* correct status for the operation is then passed by reference to
|
|
|
|
* most of the softfloat functions.
|
|
|
|
*/
|
|
|
|
|
|
|
|
typedef struct float_status {
|
|
|
|
signed char float_detect_tininess;
|
|
|
|
signed char float_rounding_mode;
|
|
|
|
uint8_t float_exception_flags;
|
|
|
|
signed char floatx80_rounding_precision;
|
|
|
|
/* should denormalised results go to zero and set the inexact flag? */
|
2020-05-05 04:54:57 +02:00
|
|
|
bool flush_to_zero;
|
2018-01-19 19:24:22 +01:00
|
|
|
/* should denormalised inputs go to zero and set the input_denormal flag? */
|
2020-05-05 04:54:57 +02:00
|
|
|
bool flush_inputs_to_zero;
|
|
|
|
bool default_nan_mode;
|
2018-05-10 23:48:17 +02:00
|
|
|
/* not always used -- see snan_bit_is_one() in softfloat-specialize.h */
|
2020-05-05 04:54:57 +02:00
|
|
|
bool snan_bit_is_one;
|
2018-01-19 19:24:22 +01:00
|
|
|
} float_status;
|
|
|
|
|
2018-01-19 17:36:40 +01:00
|
|
|
#endif /* SOFTFLOAT_TYPES_H */
|