371 lines
13 KiB
C
371 lines
13 KiB
C
/* $NetBSD: softfloat.h,v 1.1 2001/04/26 03:10:48 ross Exp $ */
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/* This is a derivative work. */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Ross Harvey.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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===============================================================================
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This C header file is part of the SoftFloat IEC/IEEE Floating-point
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Arithmetic Package, Release 2a.
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Written by John R. Hauser. This work was made possible in part by the
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International Computer Science Institute, located at Suite 600, 1947 Center
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Street, Berkeley, California 94704. Funding was partially provided by the
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National Science Foundation under grant MIP-9311980. The original version
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of this code was written as part of a project to build a fixed-point vector
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processor in collaboration with the University of California at Berkeley,
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overseen by Profs. Nelson Morgan and John Wawrzynek. More information
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is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
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arithmetic/SoftFloat.html'.
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THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
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has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
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TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
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PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
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AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
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Derivative works are acceptable, even for commercial purposes, so long as
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(1) they include prominent notice that the work is derivative, and (2) they
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include prominent notice akin to these four paragraphs for those parts of
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this code that are retained.
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===============================================================================
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*/
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#include <sys/types.h>
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <inttypes.h>
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#include <ieeefp.h>
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#else
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#include "sys/inttypes.h"
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#include "machine/ieeefp.h"
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#endif
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#include <sys/endian.h>
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/*
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-------------------------------------------------------------------------------
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The macro `FLOATX80' must be defined to enable the extended double-precision
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floating-point format `floatx80'. If this macro is not defined, the
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`floatx80' type will not be defined, and none of the functions that either
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input or output the `floatx80' type will be defined. The same applies to
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the `FLOAT128' macro and the quadruple-precision format `float128'.
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-------------------------------------------------------------------------------
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*/
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/* #define FLOATX80 */
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/* #define FLOAT128 */
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point types.
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-------------------------------------------------------------------------------
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*/
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typedef u_int32_t float32;
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typedef u_int64_t float64;
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#ifdef FLOATX80
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typedef struct {
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#if BYTE_ORDER == BIG_ENDIAN
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u_int16_t high;
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u_int64_t low;
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#else
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u_int64_t low;
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u_int16_t high;
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#endif
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} floatx80;
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#endif
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#ifdef FLOAT128
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typedef struct {
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u_int64_t high, low;
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} float128;
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#endif
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/*
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* Some of the global variables that used to be here have been removed for
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* fairly obvious (defopt-MULTIPROCESSOR) reasons. The rest (which don't
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* change dynamically) will be removed later. [ross]
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*/
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#define float_rounding_mode() fpgetround()
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point underflow tininess-detection mode.
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-------------------------------------------------------------------------------
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*/
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extern int float_detect_tininess;
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enum {
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float_tininess_after_rounding = 1,
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float_tininess_before_rounding = 0
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};
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point rounding mode.
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-------------------------------------------------------------------------------
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*/
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enum {
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float_round_nearest_even = FP_RN,
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float_round_to_zero = FP_RZ,
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float_round_down = FP_RM,
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float_round_up = FP_RP
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};
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point exception flags.
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-------------------------------------------------------------------------------
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*/
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enum {
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float_flag_inexact = FP_X_IMP,
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float_flag_underflow = FP_X_UFL,
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float_flag_overflow = FP_X_OFL,
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float_flag_divbyzero = FP_X_DZ,
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float_flag_invalid = FP_X_INV
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};
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE integer-to-floating-point conversion routines.
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-------------------------------------------------------------------------------
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*/
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float32 int32_to_float32( int );
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float64 int32_to_float64( int );
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#ifdef FLOATX80
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floatx80 int32_to_floatx80( int );
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#endif
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#ifdef FLOAT128
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float128 int32_to_float128( int );
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#endif
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#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
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float32 int64_to_float32( int64_t );
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float64 int64_to_float64( int64_t );
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#ifdef FLOATX80
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floatx80 int64_to_floatx80( int64_t );
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#endif
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#ifdef FLOAT128
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float128 int64_to_float128( int64_t );
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#endif
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE single-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int float32_to_int32( float32 );
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int float32_to_int32_round_to_zero( float32 );
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#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
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int64_t float32_to_int64( float32 );
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int64_t float32_to_int64_round_to_zero( float32 );
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#endif
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float64 float32_to_float64( float32 );
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#ifdef FLOATX80
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floatx80 float32_to_floatx80( float32 );
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#endif
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#ifdef FLOAT128
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float128 float32_to_float128( float32 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE single-precision operations.
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-------------------------------------------------------------------------------
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*/
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float32 float32_round_to_int( float32 );
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float32 float32_add( float32, float32 );
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float32 float32_sub( float32, float32 );
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float32 float32_mul( float32, float32 );
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float32 float32_div( float32, float32 );
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float32 float32_rem( float32, float32 );
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float32 float32_sqrt( float32 );
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int float32_eq( float32, float32 );
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int float32_le( float32, float32 );
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int float32_lt( float32, float32 );
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int float32_eq_signaling( float32, float32 );
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int float32_le_quiet( float32, float32 );
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int float32_lt_quiet( float32, float32 );
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#ifndef SOFTFLOAT_FOR_GCC
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int float32_is_signaling_nan( float32 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE double-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int float64_to_int32( float64 );
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int float64_to_int32_round_to_zero( float64 );
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#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
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int64_t float64_to_int64( float64 );
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int64_t float64_to_int64_round_to_zero( float64 );
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#endif
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float32 float64_to_float32( float64 );
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#ifdef FLOATX80
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floatx80 float64_to_floatx80( float64 );
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#endif
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#ifdef FLOAT128
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float128 float64_to_float128( float64 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE double-precision operations.
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-------------------------------------------------------------------------------
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*/
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#define float64_default_nan 0xFFF8000000000000LL
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static __inline int
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float64_is_nan(float64 a)
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{
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return 0xFFE0000000000000LL < a << 1;
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}
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static __inline int
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float64_is_signaling_nan(float64 a)
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{
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return (a >> 51 & 0xFFF) == 0xFFE && (a & 0x0007FFFFFFFFFFFFLL);
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}
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float64 float64_round_to_int( float64 );
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float64 float64_add( float64, float64 );
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float64 float64_sub( float64, float64 );
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float64 float64_mul( float64, float64 );
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float64 float64_div( float64, float64 );
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float64 float64_rem( float64, float64 );
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float64 float64_sqrt( float64 );
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int float64_eq( float64, float64 );
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int float64_le( float64, float64 );
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int float64_lt( float64, float64 );
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int float64_eq_signaling( float64, float64 );
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int float64_le_quiet( float64, float64 );
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int float64_lt_quiet( float64, float64 );
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#ifndef SOFTFLOAT_FOR_GCC
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int float64_is_signaling_nan( float64 );
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#endif
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#ifdef FLOATX80
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int floatx80_to_int32( floatx80 );
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int floatx80_to_int32_round_to_zero( floatx80 );
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int64_t floatx80_to_int64( floatx80 );
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int64_t floatx80_to_int64_round_to_zero( floatx80 );
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float32 floatx80_to_float32( floatx80 );
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float64 floatx80_to_float64( floatx80 );
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#ifdef FLOAT128
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float128 floatx80_to_float128( floatx80 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision rounding precision. Valid
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values are 32, 64, and 80.
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-------------------------------------------------------------------------------
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*/
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extern int floatx80_rounding_precision;
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision operations.
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-------------------------------------------------------------------------------
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*/
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floatx80 floatx80_round_to_int( floatx80 );
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floatx80 floatx80_add( floatx80, floatx80 );
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floatx80 floatx80_sub( floatx80, floatx80 );
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floatx80 floatx80_mul( floatx80, floatx80 );
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floatx80 floatx80_div( floatx80, floatx80 );
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floatx80 floatx80_rem( floatx80, floatx80 );
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floatx80 floatx80_sqrt( floatx80 );
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int floatx80_eq( floatx80, floatx80 );
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int floatx80_le( floatx80, floatx80 );
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int floatx80_lt( floatx80, floatx80 );
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int floatx80_eq_signaling( floatx80, floatx80 );
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int floatx80_le_quiet( floatx80, floatx80 );
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int floatx80_lt_quiet( floatx80, floatx80 );
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int floatx80_is_signaling_nan( floatx80 );
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#endif
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#ifdef FLOAT128
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE quadruple-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int float128_to_int32( float128 );
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int float128_to_int32_round_to_zero( float128 );
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int64_t float128_to_int64( float128 );
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int64_t float128_to_int64_round_to_zero( float128 );
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float32 float128_to_float32( float128 );
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float64 float128_to_float64( float128 );
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#ifdef FLOATX80
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floatx80 float128_to_floatx80( float128 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE quadruple-precision operations.
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-------------------------------------------------------------------------------
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*/
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float128 float128_round_to_int( float128 );
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float128 float128_add( float128, float128 );
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float128 float128_sub( float128, float128 );
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float128 float128_mul( float128, float128 );
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float128 float128_div( float128, float128 );
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float128 float128_rem( float128, float128 );
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float128 float128_sqrt( float128 );
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int float128_eq( float128, float128 );
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int float128_le( float128, float128 );
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int float128_lt( float128, float128 );
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int float128_eq_signaling( float128, float128 );
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int float128_le_quiet( float128, float128 );
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int float128_lt_quiet( float128, float128 );
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int float128_is_signaling_nan( float128 );
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#endif
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