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307 lines
11 KiB
C
307 lines
11 KiB
C
/* $NetBSD: softfloat.h,v 1.6 2002/05/12 13:12:46 bjh21 Exp $ */
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/* This is a derivative work. */
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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 2a.
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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://HTTP.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
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has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
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TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
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PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
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AND ALL 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 four 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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/*
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-------------------------------------------------------------------------------
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The macro `FLOATX80' must be defined to enable the extended double-precision
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floating-point format `floatx80'. If this macro is not defined, the
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`floatx80' type will not be defined, and none of the functions that either
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input or output the `floatx80' type will be defined. The same applies to
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the `FLOAT128' macro and the quadruple-precision format `float128'.
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-------------------------------------------------------------------------------
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*/
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/* #define FLOATX80 */
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/* #define FLOAT128 */
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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 unsigned long long float64;
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#ifdef FLOATX80
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typedef struct {
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unsigned short high;
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unsigned long long low;
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} floatx80;
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#endif
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#ifdef FLOAT128
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typedef struct {
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unsigned long long high, low;
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} float128;
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#endif
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/*
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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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*/
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#ifndef SOFTFLOAT_FOR_GCC
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extern int8 float_detect_tininess;
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#endif
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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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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point rounding mode.
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-------------------------------------------------------------------------------
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*/
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extern fp_rnd_t float_rounding_mode;
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enum {
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float_round_nearest_even = FP_RN,
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float_round_to_zero = FP_RZ,
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float_round_down = FP_RM,
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float_round_up = FP_RP
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};
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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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*/
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typedef fp_except_t fp_except;
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extern fp_except float_exception_flags;
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extern fp_except float_exception_mask;
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enum {
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float_flag_inexact = FP_X_IMP,
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float_flag_underflow = FP_X_UFL,
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float_flag_overflow = FP_X_OFL,
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float_flag_divbyzero = FP_X_DZ,
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float_flag_invalid = FP_X_INV
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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( fp_except );
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/*
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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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*/
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float32 int32_to_float32( int );
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float64 int32_to_float64( int );
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#ifdef FLOATX80
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floatx80 int32_to_floatx80( int );
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#endif
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#ifdef FLOAT128
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float128 int32_to_float128( int );
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#endif
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float32 int64_to_float32( long long );
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float64 int64_to_float64( long long );
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#ifdef FLOATX80
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floatx80 int64_to_floatx80( long long );
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#endif
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#ifdef FLOAT128
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float128 int64_to_float128( long long );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE single-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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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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unsigned int float32_to_uint32_round_to_zero( float32 );
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long long float32_to_int64( float32 );
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long long float32_to_int64_round_to_zero( float32 );
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float64 float32_to_float64( float32 );
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#ifdef FLOATX80
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floatx80 float32_to_floatx80( float32 );
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#endif
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#ifdef FLOAT128
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float128 float32_to_float128( float32 );
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#endif
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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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int float32_eq( float32, float32 );
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int float32_le( float32, float32 );
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int float32_lt( float32, float32 );
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int float32_eq_signaling( float32, float32 );
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int float32_le_quiet( float32, float32 );
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int float32_lt_quiet( float32, float32 );
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#ifndef SOFTFLOAT_FOR_GCC
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int float32_is_signaling_nan( float32 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE double-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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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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unsigned int float64_to_uint32_round_to_zero( float64 );
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long long float64_to_int64( float64 );
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long long float64_to_int64_round_to_zero( float64 );
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float32 float64_to_float32( float64 );
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#ifdef FLOATX80
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floatx80 float64_to_floatx80( float64 );
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#endif
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#ifdef FLOAT128
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float128 float64_to_float128( float64 );
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#endif
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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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int float64_eq( float64, float64 );
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int float64_le( float64, float64 );
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int float64_lt( float64, float64 );
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int float64_eq_signaling( float64, float64 );
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int float64_le_quiet( float64, float64 );
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int float64_lt_quiet( float64, float64 );
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#ifndef SOFTFLOAT_FOR_GCC
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int float64_is_signaling_nan( float64 );
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#endif
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#ifdef FLOATX80
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int floatx80_to_int32( floatx80 );
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int floatx80_to_int32_round_to_zero( floatx80 );
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long long floatx80_to_int64( floatx80 );
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long long floatx80_to_int64_round_to_zero( floatx80 );
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float32 floatx80_to_float32( floatx80 );
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float64 floatx80_to_float64( floatx80 );
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#ifdef FLOAT128
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float128 floatx80_to_float128( floatx80 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision rounding precision. Valid
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values are 32, 64, and 80.
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-------------------------------------------------------------------------------
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*/
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extern int floatx80_rounding_precision;
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE extended double-precision operations.
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-------------------------------------------------------------------------------
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*/
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floatx80 floatx80_round_to_int( floatx80 );
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floatx80 floatx80_add( floatx80, floatx80 );
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floatx80 floatx80_sub( floatx80, floatx80 );
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floatx80 floatx80_mul( floatx80, floatx80 );
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floatx80 floatx80_div( floatx80, floatx80 );
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floatx80 floatx80_rem( floatx80, floatx80 );
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floatx80 floatx80_sqrt( floatx80 );
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int floatx80_eq( floatx80, floatx80 );
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int floatx80_le( floatx80, floatx80 );
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int floatx80_lt( floatx80, floatx80 );
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int floatx80_eq_signaling( floatx80, floatx80 );
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int floatx80_le_quiet( floatx80, floatx80 );
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int floatx80_lt_quiet( floatx80, floatx80 );
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int floatx80_is_signaling_nan( floatx80 );
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#endif
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#ifdef FLOAT128
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE quadruple-precision conversion routines.
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-------------------------------------------------------------------------------
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*/
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int float128_to_int32( float128 );
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int float128_to_int32_round_to_zero( float128 );
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long long float128_to_int64( float128 );
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long long float128_to_int64_round_to_zero( float128 );
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float32 float128_to_float32( float128 );
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float64 float128_to_float64( float128 );
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#ifdef FLOATX80
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floatx80 float128_to_floatx80( float128 );
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#endif
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/*
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-------------------------------------------------------------------------------
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Software IEC/IEEE quadruple-precision operations.
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-------------------------------------------------------------------------------
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*/
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float128 float128_round_to_int( float128 );
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float128 float128_add( float128, float128 );
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float128 float128_sub( float128, float128 );
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float128 float128_mul( float128, float128 );
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float128 float128_div( float128, float128 );
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float128 float128_rem( float128, float128 );
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float128 float128_sqrt( float128 );
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int float128_eq( float128, float128 );
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int float128_le( float128, float128 );
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int float128_lt( float128, float128 );
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int float128_eq_signaling( float128, float128 );
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int float128_le_quiet( float128, float128 );
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int float128_lt_quiet( float128, float128 );
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int float128_is_signaling_nan( float128 );
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#endif
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