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276 lines
9.6 KiB
276 lines
9.6 KiB
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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 2.
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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 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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#ifndef __SOFTFLOAT_H__
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#define __SOFTFLOAT_H__
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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.
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-------------------------------------------------------------------------------
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*/
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#ifdef CONFIG_FPE_NWFPE_XP
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#define FLOATX80
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#endif
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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 u32 float32;
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typedef u64 float64;
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typedef struct {
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#ifdef __ARMEB__
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u16 __padding;
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u16 high;
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#else
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u16 high;
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u16 __padding;
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#endif
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u64 low;
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} floatx80;
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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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extern signed char 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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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point rounding mode.
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-------------------------------------------------------------------------------
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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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-------------------------------------------------------------------------------
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Software IEC/IEEE floating-point exception flags.
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-------------------------------------------------------------------------------
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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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ScottB: November 4, 1998
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Changed the enumeration to match the bit order in the FPA11.
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*/
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enum {
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float_flag_invalid = 1,
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float_flag_divbyzero = 2,
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float_flag_overflow = 4,
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float_flag_underflow = 8,
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float_flag_inexact = 16
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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( signed char );
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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( struct roundingData *, signed int );
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float64 int32_to_float64( signed int );
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#ifdef FLOATX80
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floatx80 int32_to_floatx80( signed int );
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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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signed int float32_to_int32( struct roundingData *, float32 );
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signed int float32_to_int32_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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/*
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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( struct roundingData*, float32 );
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float32 float32_add( struct roundingData *, float32, float32 );
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float32 float32_sub( struct roundingData *, float32, float32 );
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float32 float32_mul( struct roundingData *, float32, float32 );
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float32 float32_div( struct roundingData *, float32, float32 );
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float32 float32_rem( struct roundingData *, float32, float32 );
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float32 float32_sqrt( struct roundingData*, 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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char float32_is_signaling_nan( float32 );
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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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signed int float64_to_int32( struct roundingData *, float64 );
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signed int float64_to_int32_round_to_zero( float64 );
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float32 float64_to_float32( struct roundingData *, 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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/*
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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( struct roundingData *, float64 );
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float64 float64_add( struct roundingData *, float64, float64 );
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float64 float64_sub( struct roundingData *, float64, float64 );
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float64 float64_mul( struct roundingData *, float64, float64 );
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float64 float64_div( struct roundingData *, float64, float64 );
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float64 float64_rem( struct roundingData *, float64, float64 );
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float64 float64_sqrt( struct roundingData *, 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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char float64_is_signaling_nan( float64 );
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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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signed int floatx80_to_int32( struct roundingData *, floatx80 );
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signed int floatx80_to_int32_round_to_zero( floatx80 );
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float32 floatx80_to_float32( struct roundingData *, floatx80 );
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float64 floatx80_to_float64( struct roundingData *, floatx80 );
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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( struct roundingData *, floatx80 );
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floatx80 floatx80_add( struct roundingData *, floatx80, floatx80 );
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floatx80 floatx80_sub( struct roundingData *, floatx80, floatx80 );
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floatx80 floatx80_mul( struct roundingData *, floatx80, floatx80 );
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floatx80 floatx80_div( struct roundingData *, floatx80, floatx80 );
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floatx80 floatx80_rem( struct roundingData *, floatx80, floatx80 );
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floatx80 floatx80_sqrt( struct roundingData *, floatx80 );
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char floatx80_eq( floatx80, floatx80 );
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char floatx80_le( floatx80, floatx80 );
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char floatx80_lt( floatx80, floatx80 );
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char floatx80_eq_signaling( floatx80, floatx80 );
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char floatx80_le_quiet( floatx80, floatx80 );
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char floatx80_lt_quiet( floatx80, floatx80 );
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char floatx80_is_signaling_nan( floatx80 );
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#endif
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static inline flag extractFloat32Sign(float32 a)
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{
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return a >> 31;
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}
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static inline flag float32_eq_nocheck(float32 a, float32 b)
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{
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return (a == b) || ((bits32) ((a | b) << 1) == 0);
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}
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static inline flag float32_lt_nocheck(float32 a, float32 b)
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{
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flag aSign, bSign;
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aSign = extractFloat32Sign(a);
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bSign = extractFloat32Sign(b);
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if (aSign != bSign)
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return aSign && ((bits32) ((a | b) << 1) != 0);
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return (a != b) && (aSign ^ (a < b));
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}
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static inline flag extractFloat64Sign(float64 a)
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{
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return a >> 63;
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}
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static inline flag float64_eq_nocheck(float64 a, float64 b)
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{
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return (a == b) || ((bits64) ((a | b) << 1) == 0);
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}
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static inline flag float64_lt_nocheck(float64 a, float64 b)
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{
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flag aSign, bSign;
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aSign = extractFloat64Sign(a);
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bSign = extractFloat64Sign(b);
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if (aSign != bSign)
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return aSign && ((bits64) ((a | b) << 1) != 0);
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return (a != b) && (aSign ^ (a < b));
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}
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extern flag float32_is_nan( float32 a );
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extern flag float64_is_nan( float64 a );
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#endif
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