151 lines
5.6 KiB
C
151 lines
5.6 KiB
C
/* $NetBSD: softfloat.h,v 1.3 1998/01/06 00:06:13 perry Exp $ */
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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 1a.
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Written by John R. Hauser. This work was made possible by the International
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Computer Science Institute, located at Suite 600, 1947 Center Street,
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Berkeley, California 94704. Funding was provided in part by the National
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Science Foundation under grant MIP-9311980. The original version of
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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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softfloat.html'.
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THIS PACKAGE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
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been made to avoid it, THIS PACKAGE MAY CONTAIN FAULTS THAT WILL AT TIMES
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RESULT IN INCORRECT BEHAVIOR. USE OF THIS PACKAGE IS RESTRICTED TO PERSONS
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AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY AND ALL
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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 three 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 <machine/ieeefp.h>
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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 unsigned int float32;
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typedef struct {
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unsigned int high;
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unsigned int low;
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} float64;
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point rounding mode and exception flags.
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-------------------------------------------------------------------------------
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*/
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extern unsigned char float_rounding_mode;
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extern unsigned char float_exception_flags;
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/*
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-------------------------------------------------------------------------------
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Floating-point rounding mode codes.
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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_up = FP_RP,
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float_round_down = FP_RM,
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float_round_to_zero = FP_RZ
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};
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/*
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-------------------------------------------------------------------------------
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Floating-point exception flag masks.
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-------------------------------------------------------------------------------
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*/
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enum {
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float_flag_invalid = FP_X_INV,
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float_flag_divbyzero = FP_X_DZ,
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float_flag_overflow = FP_X_OFL,
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float_flag_underflow = FP_X_UFL,
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float_flag_inexact = FP_X_IMP
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};
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/*
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-------------------------------------------------------------------------------
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Floating-point underflow tininess-detection mode.
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-------------------------------------------------------------------------------
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*/
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extern char float_detect_tininess;
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enum {
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float_tininess_before_rounding = 0,
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float_tininess_after_rounding = 1
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};
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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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*/
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void float_raise( unsigned char );
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE 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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int float32_to_int32( float32 );
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int float32_to_int32_round_to_zero( float32 );
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float64 float32_to_float64( float32 );
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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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float32 float64_to_float32( float64 );
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unsigned int float64_to_uint32_round_to_zero( float64 a );
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unsigned int float32_to_uint32_round_to_zero( float32 a );
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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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char float32_eq( float32, float32 );
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char float32_le( float32, float32 );
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char float32_lt( float32, float32 );
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char float32_eq_signaling( float32, float32 );
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char float32_le_quiet( float32, float32 );
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char float32_lt_quiet( float32, float32 );
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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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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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char float64_eq( float64, float64 );
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char float64_le( float64, float64 );
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char float64_lt( float64, float64 );
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char float64_eq_signaling( float64, float64 );
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char float64_le_quiet( float64, float64 );
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char float64_lt_quiet( float64, float64 );
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