135 lines
6.0 KiB
C
135 lines
6.0 KiB
C
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/*============================================================================
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This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
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Package, Release 2b.
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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://www.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 has
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been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
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RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
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AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
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COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
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EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
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INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
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OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
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Derivative works are acceptable, even for commercial purposes, so long as
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(1) the source code for the derivative work includes prominent notice that
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the work is derivative, and (2) the source code includes prominent notice with
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these four paragraphs for those parts of this code that are retained.
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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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typedef bits32 float32;
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typedef struct {
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bits32 high, low;
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} float64;
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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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extern int8 float_detect_tininess;
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enum {
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float_tininess_after_rounding = 0,
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float_tininess_before_rounding = 1
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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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extern int8 float_rounding_mode;
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enum {
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float_round_nearest_even = 0,
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float_round_to_zero = 1,
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float_round_down = 2,
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float_round_up = 3
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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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extern int8 float_exception_flags;
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enum {
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float_flag_inexact = 1,
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float_flag_underflow = 2,
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float_flag_overflow = 4,
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float_flag_divbyzero = 8,
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float_flag_invalid = 16
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};
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/*----------------------------------------------------------------------------
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| Routine to raise any or all of the software IEC/IEEE floating-point
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| exception flags.
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*----------------------------------------------------------------------------*/
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void float_raise( int8 );
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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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float32 int32_to_float32( int32 );
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float64 int32_to_float64( int32 );
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32 float32_to_int32( float32 );
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int32 float32_to_int32_round_to_zero( float32 );
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float64 float32_to_float64( float32 );
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision operations.
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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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flag float32_eq( float32, float32 );
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flag float32_le( float32, float32 );
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flag float32_lt( float32, float32 );
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flag float32_eq_signaling( float32, float32 );
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flag float32_le_quiet( float32, float32 );
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flag float32_lt_quiet( float32, float32 );
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flag float32_is_signaling_nan( float32 );
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32 float64_to_int32( float64 );
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int32 float64_to_int32_round_to_zero( float64 );
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float32 float64_to_float32( float64 );
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision operations.
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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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flag float64_eq( float64, float64 );
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flag float64_le( float64, float64 );
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flag float64_lt( float64, float64 );
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flag float64_eq_signaling( float64, float64 );
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flag float64_le_quiet( float64, float64 );
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flag float64_lt_quiet( float64, float64 );
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flag float64_is_signaling_nan( float64 );
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