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Diffstat (limited to 'fpu/softfloat.h')
| -rw-r--r-- | fpu/softfloat.h | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/fpu/softfloat.h b/fpu/softfloat.h new file mode 100644 index 000000000..9aefbf75a --- /dev/null +++ b/fpu/softfloat.h @@ -0,0 +1,329 @@ +/*============================================================================ + +This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic +Package, Release 2b. + +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://www.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 THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE +EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE +INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR +OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE. + +Derivative works are acceptable, even for commercial purposes, so long as +(1) the source code for the derivative work includes prominent notice that +the work is derivative, and (2) the source code includes prominent notice with +these four paragraphs for those parts of this code that are retained. + +=============================================================================*/ + +#ifndef SOFTFLOAT_H +#define SOFTFLOAT_H + +#include <inttypes.h> +#include "config.h" + +/*---------------------------------------------------------------------------- +| Each of the following `typedef's defines the most convenient type that holds +| integers of at least as many bits as specified. For example, `uint8' should +| be the most convenient type that can hold unsigned integers of as many as +| 8 bits. The `flag' type must be able to hold either a 0 or 1. For most +| implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed +| to the same as `int'. +*----------------------------------------------------------------------------*/ +typedef char flag; +typedef uint8_t uint8; +typedef int8_t int8; +typedef int uint16; +typedef int int16; +typedef unsigned int uint32; +typedef signed int int32; +typedef uint64_t uint64; +typedef int64_t int64; + +/*---------------------------------------------------------------------------- +| Each of the following `typedef's defines a type that holds integers +| of _exactly_ the number of bits specified. For instance, for most +| implementation of C, `bits16' and `sbits16' should be `typedef'ed to +| `unsigned short int' and `signed short int' (or `short int'), respectively. +*----------------------------------------------------------------------------*/ +typedef uint8_t bits8; +typedef int8_t sbits8; +typedef uint16_t bits16; +typedef int16_t sbits16; +typedef uint32_t bits32; +typedef int32_t sbits32; +typedef uint64_t bits64; +typedef int64_t sbits64; + +#define LIT64( a ) a##LL +#define INLINE static inline + +/*---------------------------------------------------------------------------- +| 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'. +*----------------------------------------------------------------------------*/ +#ifdef CONFIG_SOFTFLOAT +/* bit exact soft float support */ +#define FLOATX80 +#define FLOAT128 +#else +/* native float support */ +#if (defined(__i386__) || defined(__x86_64__)) && !defined(_BSD) +#define FLOATX80 +#endif +#endif /* !CONFIG_SOFTFLOAT */ + +#define STATUS_PARAM , float_status *status +#define STATUS(field) status->field +#define STATUS_VAR , status + +#ifdef CONFIG_SOFTFLOAT +/*---------------------------------------------------------------------------- +| Software IEC/IEEE floating-point types. +*----------------------------------------------------------------------------*/ +typedef uint32_t float32; +typedef uint64_t float64; +#ifdef FLOATX80 +typedef struct { + uint64_t low; + uint16_t high; +} floatx80; +#endif +#ifdef FLOAT128 +typedef struct { +#ifdef WORDS_BIGENDIAN + uint64_t high, low; +#else + uint64_t low, high; +#endif +} float128; +#endif + +/*---------------------------------------------------------------------------- +| 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 +}; + +/*---------------------------------------------------------------------------- +| 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 +}; + +typedef struct float_status { + signed char float_detect_tininess; + signed char float_rounding_mode; + signed char float_exception_flags; +#ifdef FLOATX80 + signed char floatx80_rounding_precision; +#endif +} float_status; + +void set_float_rounding_mode(int val STATUS_PARAM); +#ifdef FLOATX80 +void set_floatx80_rounding_precision(int val STATUS_PARAM); +#endif + +/*---------------------------------------------------------------------------- +| Routine to raise any or all of the software IEC/IEEE floating-point +| exception flags. +*----------------------------------------------------------------------------*/ +void float_raise( signed char STATUS_PARAM); + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE integer-to-floating-point conversion routines. +*----------------------------------------------------------------------------*/ +float32 int32_to_float32( int STATUS_PARAM ); +float64 int32_to_float64( int STATUS_PARAM ); +#ifdef FLOATX80 +floatx80 int32_to_floatx80( int STATUS_PARAM ); +#endif +#ifdef FLOAT128 +float128 int32_to_float128( int STATUS_PARAM ); +#endif +float32 int64_to_float32( int64_t STATUS_PARAM ); +float64 int64_to_float64( int64_t STATUS_PARAM ); +#ifdef FLOATX80 +floatx80 int64_to_floatx80( int64_t STATUS_PARAM ); +#endif +#ifdef FLOAT128 +float128 int64_to_float128( int64_t STATUS_PARAM ); +#endif + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE single-precision conversion routines. +*----------------------------------------------------------------------------*/ +int float32_to_int32( float32 STATUS_PARAM ); +int float32_to_int32_round_to_zero( float32 STATUS_PARAM ); +int64_t float32_to_int64( float32 STATUS_PARAM ); +int64_t float32_to_int64_round_to_zero( float32 STATUS_PARAM ); +float64 float32_to_float64( float32 STATUS_PARAM ); +#ifdef FLOATX80 +floatx80 float32_to_floatx80( float32 STATUS_PARAM ); +#endif +#ifdef FLOAT128 +float128 float32_to_float128( float32 STATUS_PARAM ); +#endif + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE single-precision operations. +*----------------------------------------------------------------------------*/ +float32 float32_round_to_int( float32 STATUS_PARAM ); +float32 float32_add( float32, float32 STATUS_PARAM ); +float32 float32_sub( float32, float32 STATUS_PARAM ); +float32 float32_mul( float32, float32 STATUS_PARAM ); +float32 float32_div( float32, float32 STATUS_PARAM ); +float32 float32_rem( float32, float32 STATUS_PARAM ); +float32 float32_sqrt( float32 STATUS_PARAM ); +char float32_eq( float32, float32 STATUS_PARAM ); +char float32_le( float32, float32 STATUS_PARAM ); +char float32_lt( float32, float32 STATUS_PARAM ); +char float32_eq_signaling( float32, float32 STATUS_PARAM ); +char float32_le_quiet( float32, float32 STATUS_PARAM ); +char float32_lt_quiet( float32, float32 STATUS_PARAM ); +char float32_is_signaling_nan( float32 ); + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE double-precision conversion routines. +*----------------------------------------------------------------------------*/ +int float64_to_int32( float64 STATUS_PARAM ); +int float64_to_int32_round_to_zero( float64 STATUS_PARAM ); +int64_t float64_to_int64( float64 STATUS_PARAM ); +int64_t float64_to_int64_round_to_zero( float64 STATUS_PARAM ); +float32 float64_to_float32( float64 STATUS_PARAM ); +#ifdef FLOATX80 +floatx80 float64_to_floatx80( float64 STATUS_PARAM ); +#endif +#ifdef FLOAT128 +float128 float64_to_float128( float64 STATUS_PARAM ); +#endif + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE double-precision operations. +*----------------------------------------------------------------------------*/ +float64 float64_round_to_int( float64 STATUS_PARAM ); +float64 float64_add( float64, float64 STATUS_PARAM ); +float64 float64_sub( float64, float64 STATUS_PARAM ); +float64 float64_mul( float64, float64 STATUS_PARAM ); +float64 float64_div( float64, float64 STATUS_PARAM ); +float64 float64_rem( float64, float64 STATUS_PARAM ); +float64 float64_sqrt( float64 STATUS_PARAM ); +char float64_eq( float64, float64 STATUS_PARAM ); +char float64_le( float64, float64 STATUS_PARAM ); +char float64_lt( float64, float64 STATUS_PARAM ); +char float64_eq_signaling( float64, float64 STATUS_PARAM ); +char float64_le_quiet( float64, float64 STATUS_PARAM ); +char float64_lt_quiet( float64, float64 STATUS_PARAM ); +char float64_is_signaling_nan( float64 ); + +#ifdef FLOATX80 + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE extended double-precision conversion routines. +*----------------------------------------------------------------------------*/ +int floatx80_to_int32( floatx80 STATUS_PARAM ); +int floatx80_to_int32_round_to_zero( floatx80 STATUS_PARAM ); +int64_t floatx80_to_int64( floatx80 STATUS_PARAM ); +int64_t floatx80_to_int64_round_to_zero( floatx80 STATUS_PARAM ); +float32 floatx80_to_float32( floatx80 STATUS_PARAM ); +float64 floatx80_to_float64( floatx80 STATUS_PARAM ); +#ifdef FLOAT128 +float128 floatx80_to_float128( floatx80 STATUS_PARAM ); +#endif + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE extended double-precision operations. +*----------------------------------------------------------------------------*/ +floatx80 floatx80_round_to_int( floatx80 STATUS_PARAM ); +floatx80 floatx80_add( floatx80, floatx80 STATUS_PARAM ); +floatx80 floatx80_sub( floatx80, floatx80 STATUS_PARAM ); +floatx80 floatx80_mul( floatx80, floatx80 STATUS_PARAM ); +floatx80 floatx80_div( floatx80, floatx80 STATUS_PARAM ); +floatx80 floatx80_rem( floatx80, floatx80 STATUS_PARAM ); +floatx80 floatx80_sqrt( floatx80 STATUS_PARAM ); +char floatx80_eq( floatx80, floatx80 STATUS_PARAM ); +char floatx80_le( floatx80, floatx80 STATUS_PARAM ); +char floatx80_lt( floatx80, floatx80 STATUS_PARAM ); +char floatx80_eq_signaling( floatx80, floatx80 STATUS_PARAM ); +char floatx80_le_quiet( floatx80, floatx80 STATUS_PARAM ); +char floatx80_lt_quiet( floatx80, floatx80 STATUS_PARAM ); +char floatx80_is_signaling_nan( floatx80 ); + +#endif + +#ifdef FLOAT128 + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE quadruple-precision conversion routines. +*----------------------------------------------------------------------------*/ +int float128_to_int32( float128 STATUS_PARAM ); +int float128_to_int32_round_to_zero( float128 STATUS_PARAM ); +int64_t float128_to_int64( float128 STATUS_PARAM ); +int64_t float128_to_int64_round_to_zero( float128 STATUS_PARAM ); +float32 float128_to_float32( float128 STATUS_PARAM ); +float64 float128_to_float64( float128 STATUS_PARAM ); +#ifdef FLOATX80 +floatx80 float128_to_floatx80( float128 STATUS_PARAM ); +#endif + +/*---------------------------------------------------------------------------- +| Software IEC/IEEE quadruple-precision operations. +*----------------------------------------------------------------------------*/ +float128 float128_round_to_int( float128 STATUS_PARAM ); +float128 float128_add( float128, float128 STATUS_PARAM ); +float128 float128_sub( float128, float128 STATUS_PARAM ); +float128 float128_mul( float128, float128 STATUS_PARAM ); +float128 float128_div( float128, float128 STATUS_PARAM ); +float128 float128_rem( float128, float128 STATUS_PARAM ); +float128 float128_sqrt( float128 STATUS_PARAM ); +char float128_eq( float128, float128 STATUS_PARAM ); +char float128_le( float128, float128 STATUS_PARAM ); +char float128_lt( float128, float128 STATUS_PARAM ); +char float128_eq_signaling( float128, float128 STATUS_PARAM ); +char float128_le_quiet( float128, float128 STATUS_PARAM ); +char float128_lt_quiet( float128, float128 STATUS_PARAM ); +char float128_is_signaling_nan( float128 ); + +#endif + +#else /* CONFIG_SOFTFLOAT */ + +#include "softfloat-native.h" + +#endif /* !CONFIG_SOFTFLOAT */ + +#endif /* !SOFTFLOAT_H */ |