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281 lines
9.8 KiB
281 lines
9.8 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 |
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http://www.jhauser.us/arithmetic/SoftFloat-2b/SoftFloat-source.txt |
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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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} __attribute__ ((packed,aligned(4))) 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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extern flag floatx80_is_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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extern int32 float64_to_uint32( struct roundingData *roundData, float64 a ); |
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extern int32 float64_to_uint32_round_to_zero( float64 a ); |
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#endif
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