120 lines
4.4 KiB
C
120 lines
4.4 KiB
C
|
|
/*
|
|
===============================================================================
|
|
|
|
This C header file is part of the SoftFloat IEC/IEEE Floating-point
|
|
Arithmetic Package, Release 2.
|
|
|
|
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 three paragraphs for those parts of
|
|
this code that are retained.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point types.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
typedef unsigned int float32;
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point underflow tininess-detection mode.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
extern int float_detect_tininess;
|
|
enum {
|
|
float_tininess_after_rounding = 0,
|
|
float_tininess_before_rounding = 1
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point rounding mode.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
extern int float_rounding_mode;
|
|
enum {
|
|
float_round_nearest_even = 0,
|
|
float_round_to_zero = 1,
|
|
float_round_up = 2,
|
|
float_round_down = 3
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE floating-point exception flags.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
extern int float_exception_flags;
|
|
enum {
|
|
float_flag_inexact = 1,
|
|
float_flag_divbyzero = 2,
|
|
float_flag_underflow = 4,
|
|
float_flag_overflow = 8,
|
|
float_flag_invalid = 16
|
|
};
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Routine to raise any or all of the software IEC/IEEE floating-point
|
|
exception flags.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
void float_raise( int );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE integer-to-floating-point conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
float32 int32_to_float32( int );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
Software IEC/IEEE single-precision conversion routines.
|
|
-------------------------------------------------------------------------------
|
|
*/
|
|
int float32_to_int32( float32 );
|
|
int float32_to_int32_round_to_zero( float32 );
|
|
|
|
/*
|
|
-------------------------------------------------------------------------------
|
|
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 );
|
|
int float32_is_signaling_nan( float32 );
|
|
|