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Diffstat (limited to 'sys/lib/libkern/softfloat.h')
| -rw-r--r-- | sys/lib/libkern/softfloat.h | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/sys/lib/libkern/softfloat.h b/sys/lib/libkern/softfloat.h new file mode 100644 index 00000000000..032408f40c7 --- /dev/null +++ b/sys/lib/libkern/softfloat.h @@ -0,0 +1,376 @@ +/* $OpenBSD: softfloat.h,v 1.1 2002/04/28 20:55:14 pvalchev Exp $ */ +/* $NetBSD: softfloat.h,v 1.1 2001/04/26 03:10:48 ross Exp $ */ + +/* This is a derivative work. */ + +/*- + * Copyright (c) 2001 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Ross Harvey. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. + */ + +/* +=============================================================================== + +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 ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM +THEIR OWN USE OF THE SOFTWARE, AND WHO ALSO EFFECTIVELY INDEMNIFY +(possibly via similar legal warning) JOHN HAUSER AND THE INTERNATIONAL +COMPUTER SCIENCE INSTITUTE AGAINST ALL LOSSES, COSTS, OR OTHER PROBLEMS +ARISING FROM THE USE OF THE SOFTWARE BY THEIR CUSTOMERS AND CLIENTS. + +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. + +=============================================================================== +*/ + +#ifndef NO_IEEE + +#include <sys/types.h> + +#if !defined(_KERNEL) && !defined(_STANDALONE) +#include <ieeefp.h> +#else +#include "machine/ieeefp.h" +#endif +#include <sys/endian.h> + +/* +------------------------------------------------------------------------------- +The macro `FLOATX80' must be defined to enable the extended double-precision +floating-point format `floatx80'. If this macro is not defined, the +`floatx80' type will not be defined, and none of the functions that either +input or output the `floatx80' type will be defined. The same applies to +the `FLOAT128' macro and the quadruple-precision format `float128'. +------------------------------------------------------------------------------- +*/ +/* #define FLOATX80 */ +/* #define FLOAT128 */ + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point types. +------------------------------------------------------------------------------- +*/ +typedef u_int32_t float32; +typedef u_int64_t float64; +#ifdef FLOATX80 +typedef struct { +#if BYTE_ORDER == BIG_ENDIAN + u_int16_t high; + u_int64_t low; +#else + u_int64_t low; + u_int16_t high; +#endif +} floatx80; +#endif +#ifdef FLOAT128 +typedef struct { + u_int64_t high, low; +} float128; +#endif + +/* + * Some of the global variables that used to be here have been removed for + * fairly obvious (defopt-MULTIPROCESSOR) reasons. The rest (which don't + * change dynamically) will be removed later. [ross] + */ + +#define float_rounding_mode() fpgetround() + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point underflow tininess-detection mode. +------------------------------------------------------------------------------- +*/ + +extern int float_detect_tininess; +enum { + float_tininess_after_rounding = 1, + float_tininess_before_rounding = 0 +}; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point rounding mode. +------------------------------------------------------------------------------- +*/ + +enum { + float_round_nearest_even = FP_RN, + float_round_to_zero = FP_RZ, + float_round_down = FP_RM, + float_round_up = FP_RP +}; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point exception flags. +------------------------------------------------------------------------------- +*/ + +enum { + float_flag_inexact = FP_X_IMP, + float_flag_underflow = FP_X_UFL, + float_flag_overflow = FP_X_OFL, + float_flag_divbyzero = FP_X_DZ, + float_flag_invalid = FP_X_INV +}; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE integer-to-floating-point conversion routines. +------------------------------------------------------------------------------- +*/ +float32 int32_to_float32( int ); +float64 int32_to_float64( int ); +#ifdef FLOATX80 +floatx80 int32_to_floatx80( int ); +#endif +#ifdef FLOAT128 +float128 int32_to_float128( int ); +#endif +#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */ +float32 int64_to_float32( int64_t ); +float64 int64_to_float64( int64_t ); +#ifdef FLOATX80 +floatx80 int64_to_floatx80( int64_t ); +#endif +#ifdef FLOAT128 +float128 int64_to_float128( int64_t ); +#endif +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE single-precision conversion routines. +------------------------------------------------------------------------------- +*/ +int float32_to_int32( float32 ); +int float32_to_int32_round_to_zero( float32 ); +#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ +int64_t float32_to_int64( float32 ); +int64_t float32_to_int64_round_to_zero( float32 ); +#endif +float64 float32_to_float64( float32 ); +#ifdef FLOATX80 +floatx80 float32_to_floatx80( float32 ); +#endif +#ifdef FLOAT128 +float128 float32_to_float128( float32 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE single-precision operations. +------------------------------------------------------------------------------- +*/ +float32 float32_round_to_int( float32 ); +float32 float32_add( float32, float32 ); +float32 float32_sub( float32, float32 ); +float32 float32_mul( float32, float32 ); +float32 float32_div( float32, float32 ); +float32 float32_rem( float32, float32 ); +float32 float32_sqrt( float32 ); +int float32_eq( float32, float32 ); +int float32_le( float32, float32 ); +int float32_lt( float32, float32 ); +int float32_eq_signaling( float32, float32 ); +int float32_le_quiet( float32, float32 ); +int float32_lt_quiet( float32, float32 ); +#ifndef SOFTFLOAT_FOR_GCC +int float32_is_signaling_nan( float32 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE double-precision conversion routines. +------------------------------------------------------------------------------- +*/ +int float64_to_int32( float64 ); +int float64_to_int32_round_to_zero( float64 ); +#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */ +int64_t float64_to_int64( float64 ); +int64_t float64_to_int64_round_to_zero( float64 ); +#endif +float32 float64_to_float32( float64 ); +#ifdef FLOATX80 +floatx80 float64_to_floatx80( float64 ); +#endif +#ifdef FLOAT128 +float128 float64_to_float128( float64 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE double-precision operations. +------------------------------------------------------------------------------- +*/ +#define float64_default_nan 0xFFF8000000000000LL + +static __inline int +float64_is_nan(float64 a) +{ + return 0xFFE0000000000000LL < a << 1; +} + +static __inline int +float64_is_signaling_nan(float64 a) +{ + return (a >> 51 & 0xFFF) == 0xFFE && (a & 0x0007FFFFFFFFFFFFLL); +} + +float64 float64_round_to_int( float64 ); +float64 float64_add( float64, float64 ); +float64 float64_sub( float64, float64 ); +float64 float64_mul( float64, float64 ); +float64 float64_div( float64, float64 ); +float64 float64_rem( float64, float64 ); +float64 float64_sqrt( float64 ); +int float64_eq( float64, float64 ); +int float64_le( float64, float64 ); +int float64_lt( float64, float64 ); +int float64_eq_signaling( float64, float64 ); +int float64_le_quiet( float64, float64 ); +int float64_lt_quiet( float64, float64 ); +#ifndef SOFTFLOAT_FOR_GCC +int float64_is_signaling_nan( float64 ); +#endif + +#ifdef FLOATX80 + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE extended double-precision conversion routines. +------------------------------------------------------------------------------- +*/ +int floatx80_to_int32( floatx80 ); +int floatx80_to_int32_round_to_zero( floatx80 ); +int64_t floatx80_to_int64( floatx80 ); +int64_t floatx80_to_int64_round_to_zero( floatx80 ); +float32 floatx80_to_float32( floatx80 ); +float64 floatx80_to_float64( floatx80 ); +#ifdef FLOAT128 +float128 floatx80_to_float128( floatx80 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE extended double-precision rounding precision. Valid +values are 32, 64, and 80. +------------------------------------------------------------------------------- +*/ +extern int floatx80_rounding_precision; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE extended double-precision operations. +------------------------------------------------------------------------------- +*/ +floatx80 floatx80_round_to_int( floatx80 ); +floatx80 floatx80_add( floatx80, floatx80 ); +floatx80 floatx80_sub( floatx80, floatx80 ); +floatx80 floatx80_mul( floatx80, floatx80 ); +floatx80 floatx80_div( floatx80, floatx80 ); +floatx80 floatx80_rem( floatx80, floatx80 ); +floatx80 floatx80_sqrt( floatx80 ); +int floatx80_eq( floatx80, floatx80 ); +int floatx80_le( floatx80, floatx80 ); +int floatx80_lt( floatx80, floatx80 ); +int floatx80_eq_signaling( floatx80, floatx80 ); +int floatx80_le_quiet( floatx80, floatx80 ); +int floatx80_lt_quiet( floatx80, floatx80 ); +int floatx80_is_signaling_nan( floatx80 ); + +#endif + +#ifdef FLOAT128 + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE quadruple-precision conversion routines. +------------------------------------------------------------------------------- +*/ +int float128_to_int32( float128 ); +int float128_to_int32_round_to_zero( float128 ); +int64_t float128_to_int64( float128 ); +int64_t float128_to_int64_round_to_zero( float128 ); +float32 float128_to_float32( float128 ); +float64 float128_to_float64( float128 ); +#ifdef FLOATX80 +floatx80 float128_to_floatx80( float128 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE quadruple-precision operations. +------------------------------------------------------------------------------- +*/ +float128 float128_round_to_int( float128 ); +float128 float128_add( float128, float128 ); +float128 float128_sub( float128, float128 ); +float128 float128_mul( float128, float128 ); +float128 float128_div( float128, float128 ); +float128 float128_rem( float128, float128 ); +float128 float128_sqrt( float128 ); +int float128_eq( float128, float128 ); +int float128_le( float128, float128 ); +int float128_lt( float128, float128 ); +int float128_eq_signaling( float128, float128 ); +int float128_le_quiet( float128, float128 ); +int float128_lt_quiet( float128, float128 ); +int float128_is_signaling_nan( float128 ); + +#endif + +#endif /* !NO_IEEE */ |