Home | History | Annotate | Line # | Download | only in softfloat
      1  1.5  matt /*	$NetBSD: softfloat.h,v 1.5 2011/07/07 07:14:57 matt Exp $	*/
      2  1.2  matt 
      3  1.2  matt /* This is a derivative work. */
      4  1.2  matt 
      5  1.2  matt /*
      6  1.2  matt ===============================================================================
      7  1.2  matt 
      8  1.2  matt This C header file is part of the SoftFloat IEC/IEEE Floating-point
      9  1.2  matt Arithmetic Package, Release 2a.
     10  1.2  matt 
     11  1.2  matt Written by John R. Hauser.  This work was made possible in part by the
     12  1.2  matt International Computer Science Institute, located at Suite 600, 1947 Center
     13  1.2  matt Street, Berkeley, California 94704.  Funding was partially provided by the
     14  1.2  matt National Science Foundation under grant MIP-9311980.  The original version
     15  1.2  matt of this code was written as part of a project to build a fixed-point vector
     16  1.2  matt processor in collaboration with the University of California at Berkeley,
     17  1.2  matt overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
     18  1.2  matt is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
     19  1.2  matt arithmetic/SoftFloat.html'.
     20  1.2  matt 
     21  1.2  matt THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
     22  1.2  matt has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
     23  1.2  matt TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
     24  1.2  matt PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
     25  1.2  matt AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
     26  1.2  matt 
     27  1.2  matt Derivative works are acceptable, even for commercial purposes, so long as
     28  1.2  matt (1) they include prominent notice that the work is derivative, and (2) they
     29  1.2  matt include prominent notice akin to these four paragraphs for those parts of
     30  1.2  matt this code that are retained.
     31  1.2  matt 
     32  1.2  matt ===============================================================================
     33  1.2  matt */
     34  1.2  matt 
     35  1.2  matt /*
     36  1.2  matt -------------------------------------------------------------------------------
     37  1.2  matt The macro `FLOATX80' must be defined to enable the extended double-precision
     38  1.2  matt floating-point format `floatx80'.  If this macro is not defined, the
     39  1.2  matt `floatx80' type will not be defined, and none of the functions that either
     40  1.2  matt input or output the `floatx80' type will be defined.  The same applies to
     41  1.2  matt the `FLOAT128' macro and the quadruple-precision format `float128'.
     42  1.2  matt -------------------------------------------------------------------------------
     43  1.2  matt */
     44  1.2  matt /* #define FLOATX80 */
     45  1.3  matt #if defined(__mips_n32) || defined(__mips_n64)
     46  1.3  matt #define FLOAT128
     47  1.3  matt #endif
     48  1.2  matt 
     49  1.2  matt #include <machine/ieeefp.h>
     50  1.2  matt 
     51  1.2  matt /*
     52  1.2  matt -------------------------------------------------------------------------------
     53  1.2  matt Software IEC/IEEE floating-point types.
     54  1.2  matt -------------------------------------------------------------------------------
     55  1.2  matt */
     56  1.2  matt typedef unsigned int float32;
     57  1.2  matt typedef unsigned long long float64;
     58  1.2  matt #ifdef FLOATX80
     59  1.2  matt typedef struct {
     60  1.2  matt     unsigned short high;
     61  1.2  matt     unsigned long long low;
     62  1.2  matt } floatx80;
     63  1.2  matt #endif
     64  1.2  matt #ifdef FLOAT128
     65  1.2  matt typedef struct {
     66  1.2  matt     unsigned long long high, low;
     67  1.2  matt } float128;
     68  1.2  matt #endif
     69  1.2  matt 
     70  1.2  matt /*
     71  1.2  matt -------------------------------------------------------------------------------
     72  1.2  matt Software IEC/IEEE floating-point underflow tininess-detection mode.
     73  1.2  matt -------------------------------------------------------------------------------
     74  1.2  matt */
     75  1.2  matt #ifndef SOFTFLOAT_FOR_GCC
     76  1.2  matt extern int float_detect_tininess;
     77  1.2  matt #endif
     78  1.2  matt enum {
     79  1.2  matt     float_tininess_after_rounding  = 0,
     80  1.2  matt     float_tininess_before_rounding = 1
     81  1.2  matt };
     82  1.2  matt 
     83  1.2  matt /*
     84  1.2  matt -------------------------------------------------------------------------------
     85  1.2  matt Software IEC/IEEE floating-point rounding mode.
     86  1.2  matt -------------------------------------------------------------------------------
     87  1.2  matt */
     88  1.2  matt extern fp_rnd float_rounding_mode;
     89  1.5  matt #define float_round_nearest_even	FP_RN
     90  1.5  matt #define float_round_to_zero		FP_RZ
     91  1.5  matt #define float_round_down		FP_RM
     92  1.5  matt #define float_round_up			FP_RP
     93  1.2  matt 
     94  1.2  matt /*
     95  1.2  matt -------------------------------------------------------------------------------
     96  1.2  matt Software IEC/IEEE floating-point exception flags.
     97  1.2  matt -------------------------------------------------------------------------------
     98  1.2  matt */
     99  1.2  matt extern fp_except float_exception_flags;
    100  1.2  matt extern fp_except float_exception_mask;
    101  1.2  matt enum {
    102  1.2  matt     float_flag_inexact   = FP_X_IMP,
    103  1.2  matt     float_flag_underflow = FP_X_UFL,
    104  1.2  matt     float_flag_overflow  = FP_X_OFL,
    105  1.2  matt     float_flag_divbyzero = FP_X_DZ,
    106  1.2  matt     float_flag_invalid   = FP_X_INV
    107  1.2  matt };
    108  1.2  matt 
    109  1.2  matt /*
    110  1.2  matt -------------------------------------------------------------------------------
    111  1.2  matt Routine to raise any or all of the software IEC/IEEE floating-point
    112  1.2  matt exception flags.
    113  1.2  matt -------------------------------------------------------------------------------
    114  1.2  matt */
    115  1.2  matt void float_raise( fp_except );
    116  1.2  matt 
    117  1.2  matt /*
    118  1.2  matt -------------------------------------------------------------------------------
    119  1.2  matt Software IEC/IEEE integer-to-floating-point conversion routines.
    120  1.2  matt -------------------------------------------------------------------------------
    121  1.2  matt */
    122  1.4  matt float32 int32_to_float32( int32 );
    123  1.4  matt float32 uint32_to_float32( uint32 );
    124  1.4  matt float64 int32_to_float64( int32 );
    125  1.4  matt float64 uint32_to_float64( uint32 );
    126  1.2  matt #ifdef FLOATX80
    127  1.4  matt floatx80 int32_to_floatx80( int32 );
    128  1.4  matt floatx80 uint32_to_floatx80( uint32 );
    129  1.2  matt #endif
    130  1.2  matt #ifdef FLOAT128
    131  1.4  matt float128 int32_to_float128( int32 );
    132  1.4  matt float128 uint32_to_float128( uint32 );
    133  1.2  matt #endif
    134  1.2  matt #ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
    135  1.2  matt float32 int64_to_float32( long long );
    136  1.2  matt float64 int64_to_float64( long long );
    137  1.2  matt #ifdef FLOATX80
    138  1.2  matt floatx80 int64_to_floatx80( long long );
    139  1.2  matt #endif
    140  1.3  matt #endif
    141  1.2  matt #ifdef FLOAT128
    142  1.2  matt float128 int64_to_float128( long long );
    143  1.2  matt #endif
    144  1.2  matt 
    145  1.2  matt /*
    146  1.2  matt -------------------------------------------------------------------------------
    147  1.2  matt Software IEC/IEEE single-precision conversion routines.
    148  1.2  matt -------------------------------------------------------------------------------
    149  1.2  matt */
    150  1.2  matt int float32_to_int32( float32 );
    151  1.2  matt int float32_to_int32_round_to_zero( float32 );
    152  1.2  matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
    153  1.2  matt unsigned int float32_to_uint32_round_to_zero( float32 );
    154  1.2  matt #endif
    155  1.2  matt #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
    156  1.2  matt long long float32_to_int64( float32 );
    157  1.2  matt long long float32_to_int64_round_to_zero( float32 );
    158  1.2  matt #endif
    159  1.2  matt float64 float32_to_float64( float32 );
    160  1.2  matt #ifdef FLOATX80
    161  1.2  matt floatx80 float32_to_floatx80( float32 );
    162  1.2  matt #endif
    163  1.2  matt #ifdef FLOAT128
    164  1.2  matt float128 float32_to_float128( float32 );
    165  1.2  matt #endif
    166  1.2  matt 
    167  1.2  matt /*
    168  1.2  matt -------------------------------------------------------------------------------
    169  1.2  matt Software IEC/IEEE single-precision operations.
    170  1.2  matt -------------------------------------------------------------------------------
    171  1.2  matt */
    172  1.2  matt float32 float32_round_to_int( float32 );
    173  1.2  matt float32 float32_add( float32, float32 );
    174  1.2  matt float32 float32_sub( float32, float32 );
    175  1.2  matt float32 float32_mul( float32, float32 );
    176  1.2  matt float32 float32_div( float32, float32 );
    177  1.2  matt float32 float32_rem( float32, float32 );
    178  1.2  matt float32 float32_sqrt( float32 );
    179  1.2  matt int float32_eq( float32, float32 );
    180  1.2  matt int float32_le( float32, float32 );
    181  1.2  matt int float32_lt( float32, float32 );
    182  1.2  matt int float32_eq_signaling( float32, float32 );
    183  1.2  matt int float32_le_quiet( float32, float32 );
    184  1.2  matt int float32_lt_quiet( float32, float32 );
    185  1.2  matt #ifndef SOFTFLOAT_FOR_GCC
    186  1.2  matt int float32_is_signaling_nan( float32 );
    187  1.2  matt #endif
    188  1.2  matt 
    189  1.2  matt /*
    190  1.2  matt -------------------------------------------------------------------------------
    191  1.2  matt Software IEC/IEEE double-precision conversion routines.
    192  1.2  matt -------------------------------------------------------------------------------
    193  1.2  matt */
    194  1.2  matt int float64_to_int32( float64 );
    195  1.2  matt int float64_to_int32_round_to_zero( float64 );
    196  1.2  matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
    197  1.2  matt unsigned int float64_to_uint32_round_to_zero( float64 );
    198  1.2  matt #endif
    199  1.2  matt #ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
    200  1.2  matt long long float64_to_int64( float64 );
    201  1.2  matt long long float64_to_int64_round_to_zero( float64 );
    202  1.2  matt #endif
    203  1.2  matt float32 float64_to_float32( float64 );
    204  1.2  matt #ifdef FLOATX80
    205  1.2  matt floatx80 float64_to_floatx80( float64 );
    206  1.2  matt #endif
    207  1.2  matt #ifdef FLOAT128
    208  1.2  matt float128 float64_to_float128( float64 );
    209  1.2  matt #endif
    210  1.2  matt 
    211  1.2  matt /*
    212  1.2  matt -------------------------------------------------------------------------------
    213  1.2  matt Software IEC/IEEE double-precision operations.
    214  1.2  matt -------------------------------------------------------------------------------
    215  1.2  matt */
    216  1.2  matt float64 float64_round_to_int( float64 );
    217  1.2  matt float64 float64_add( float64, float64 );
    218  1.2  matt float64 float64_sub( float64, float64 );
    219  1.2  matt float64 float64_mul( float64, float64 );
    220  1.2  matt float64 float64_div( float64, float64 );
    221  1.2  matt float64 float64_rem( float64, float64 );
    222  1.2  matt float64 float64_sqrt( float64 );
    223  1.2  matt int float64_eq( float64, float64 );
    224  1.2  matt int float64_le( float64, float64 );
    225  1.2  matt int float64_lt( float64, float64 );
    226  1.2  matt int float64_eq_signaling( float64, float64 );
    227  1.2  matt int float64_le_quiet( float64, float64 );
    228  1.2  matt int float64_lt_quiet( float64, float64 );
    229  1.2  matt #ifndef SOFTFLOAT_FOR_GCC
    230  1.2  matt int float64_is_signaling_nan( float64 );
    231  1.2  matt #endif
    232  1.2  matt 
    233  1.2  matt #ifdef FLOATX80
    234  1.2  matt 
    235  1.2  matt /*
    236  1.2  matt -------------------------------------------------------------------------------
    237  1.2  matt Software IEC/IEEE extended double-precision conversion routines.
    238  1.2  matt -------------------------------------------------------------------------------
    239  1.2  matt */
    240  1.2  matt int floatx80_to_int32( floatx80 );
    241  1.2  matt int floatx80_to_int32_round_to_zero( floatx80 );
    242  1.2  matt long long floatx80_to_int64( floatx80 );
    243  1.2  matt long long floatx80_to_int64_round_to_zero( floatx80 );
    244  1.2  matt float32 floatx80_to_float32( floatx80 );
    245  1.2  matt float64 floatx80_to_float64( floatx80 );
    246  1.2  matt #ifdef FLOAT128
    247  1.2  matt float128 floatx80_to_float128( floatx80 );
    248  1.2  matt #endif
    249  1.2  matt 
    250  1.2  matt /*
    251  1.2  matt -------------------------------------------------------------------------------
    252  1.2  matt Software IEC/IEEE extended double-precision rounding precision.  Valid
    253  1.2  matt values are 32, 64, and 80.
    254  1.2  matt -------------------------------------------------------------------------------
    255  1.2  matt */
    256  1.2  matt extern int floatx80_rounding_precision;
    257  1.2  matt 
    258  1.2  matt /*
    259  1.2  matt -------------------------------------------------------------------------------
    260  1.2  matt Software IEC/IEEE extended double-precision operations.
    261  1.2  matt -------------------------------------------------------------------------------
    262  1.2  matt */
    263  1.2  matt floatx80 floatx80_round_to_int( floatx80 );
    264  1.2  matt floatx80 floatx80_add( floatx80, floatx80 );
    265  1.2  matt floatx80 floatx80_sub( floatx80, floatx80 );
    266  1.2  matt floatx80 floatx80_mul( floatx80, floatx80 );
    267  1.2  matt floatx80 floatx80_div( floatx80, floatx80 );
    268  1.2  matt floatx80 floatx80_rem( floatx80, floatx80 );
    269  1.2  matt floatx80 floatx80_sqrt( floatx80 );
    270  1.2  matt int floatx80_eq( floatx80, floatx80 );
    271  1.2  matt int floatx80_le( floatx80, floatx80 );
    272  1.2  matt int floatx80_lt( floatx80, floatx80 );
    273  1.2  matt int floatx80_eq_signaling( floatx80, floatx80 );
    274  1.2  matt int floatx80_le_quiet( floatx80, floatx80 );
    275  1.2  matt int floatx80_lt_quiet( floatx80, floatx80 );
    276  1.2  matt int floatx80_is_signaling_nan( floatx80 );
    277  1.2  matt 
    278  1.2  matt #endif
    279  1.2  matt 
    280  1.2  matt #ifdef FLOAT128
    281  1.2  matt 
    282  1.2  matt /*
    283  1.2  matt -------------------------------------------------------------------------------
    284  1.2  matt Software IEC/IEEE quadruple-precision conversion routines.
    285  1.2  matt -------------------------------------------------------------------------------
    286  1.2  matt */
    287  1.2  matt int float128_to_int32( float128 );
    288  1.2  matt int float128_to_int32_round_to_zero( float128 );
    289  1.2  matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
    290  1.2  matt unsigned int float128_to_uint32_round_to_zero( float64 );
    291  1.2  matt #endif
    292  1.2  matt long long float128_to_int64( float128 );
    293  1.2  matt long long float128_to_int64_round_to_zero( float128 );
    294  1.2  matt #if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
    295  1.2  matt unsigned long long float128_to_uint64_round_to_zero( float128 );
    296  1.2  matt #endif
    297  1.2  matt float32 float128_to_float32( float128 );
    298  1.2  matt float64 float128_to_float64( float128 );
    299  1.2  matt #ifdef FLOATX80
    300  1.2  matt floatx80 float128_to_floatx80( float128 );
    301  1.2  matt #endif
    302  1.2  matt 
    303  1.2  matt /*
    304  1.2  matt -------------------------------------------------------------------------------
    305  1.2  matt Software IEC/IEEE quadruple-precision operations.
    306  1.2  matt -------------------------------------------------------------------------------
    307  1.2  matt */
    308  1.2  matt float128 float128_round_to_int( float128 );
    309  1.2  matt float128 float128_add( float128, float128 );
    310  1.2  matt float128 float128_sub( float128, float128 );
    311  1.2  matt float128 float128_mul( float128, float128 );
    312  1.2  matt float128 float128_div( float128, float128 );
    313  1.2  matt float128 float128_rem( float128, float128 );
    314  1.2  matt float128 float128_sqrt( float128 );
    315  1.2  matt int float128_eq( float128, float128 );
    316  1.2  matt int float128_le( float128, float128 );
    317  1.2  matt int float128_lt( float128, float128 );
    318  1.2  matt int float128_eq_signaling( float128, float128 );
    319  1.2  matt int float128_le_quiet( float128, float128 );
    320  1.2  matt int float128_lt_quiet( float128, float128 );
    321  1.2  matt int float128_is_signaling_nan( float128 );
    322  1.3  matt flag float128_is_nan( float128 );
    323  1.2  matt 
    324  1.2  matt #endif
    325  1.2  matt 
    326