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Annotation of qemu/fpu/softfloat.h, revision 1.1

1.1     ! root        1: /*============================================================================
        !             2: 
        !             3: This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
        !             4: Package, Release 2b.
        !             5: 
        !             6: Written by John R. Hauser.  This work was made possible in part by the
        !             7: International Computer Science Institute, located at Suite 600, 1947 Center
        !             8: Street, Berkeley, California 94704.  Funding was partially provided by the
        !             9: National Science Foundation under grant MIP-9311980.  The original version
        !            10: of this code was written as part of a project to build a fixed-point vector
        !            11: processor in collaboration with the University of California at Berkeley,
        !            12: overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
        !            13: is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
        !            14: arithmetic/SoftFloat.html'.
        !            15: 
        !            16: THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort has
        !            17: been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
        !            18: RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
        !            19: AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
        !            20: COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
        !            21: EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
        !            22: INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
        !            23: OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
        !            24: 
        !            25: Derivative works are acceptable, even for commercial purposes, so long as
        !            26: (1) the source code for the derivative work includes prominent notice that
        !            27: the work is derivative, and (2) the source code includes prominent notice with
        !            28: these four paragraphs for those parts of this code that are retained.
        !            29: 
        !            30: =============================================================================*/
        !            31: 
        !            32: #ifndef SOFTFLOAT_H
        !            33: #define SOFTFLOAT_H
        !            34: 
        !            35: #include <inttypes.h>
        !            36: #include "config.h"
        !            37: 
        !            38: /*----------------------------------------------------------------------------
        !            39: | Each of the following `typedef's defines the most convenient type that holds
        !            40: | integers of at least as many bits as specified.  For example, `uint8' should
        !            41: | be the most convenient type that can hold unsigned integers of as many as
        !            42: | 8 bits.  The `flag' type must be able to hold either a 0 or 1.  For most
        !            43: | implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed
        !            44: | to the same as `int'.
        !            45: *----------------------------------------------------------------------------*/
        !            46: typedef char flag;
        !            47: typedef uint8_t uint8;
        !            48: typedef int8_t int8;
        !            49: typedef int uint16;
        !            50: typedef int int16;
        !            51: typedef unsigned int uint32;
        !            52: typedef signed int int32;
        !            53: typedef uint64_t uint64;
        !            54: typedef int64_t int64;
        !            55: 
        !            56: /*----------------------------------------------------------------------------
        !            57: | Each of the following `typedef's defines a type that holds integers
        !            58: | of _exactly_ the number of bits specified.  For instance, for most
        !            59: | implementation of C, `bits16' and `sbits16' should be `typedef'ed to
        !            60: | `unsigned short int' and `signed short int' (or `short int'), respectively.
        !            61: *----------------------------------------------------------------------------*/
        !            62: typedef uint8_t bits8;
        !            63: typedef int8_t sbits8;
        !            64: typedef uint16_t bits16;
        !            65: typedef int16_t sbits16;
        !            66: typedef uint32_t bits32;
        !            67: typedef int32_t sbits32;
        !            68: typedef uint64_t bits64;
        !            69: typedef int64_t sbits64;
        !            70: 
        !            71: #define LIT64( a ) a##LL
        !            72: #define INLINE static inline
        !            73: 
        !            74: /*----------------------------------------------------------------------------
        !            75: | The macro `FLOATX80' must be defined to enable the extended double-precision
        !            76: | floating-point format `floatx80'.  If this macro is not defined, the
        !            77: | `floatx80' type will not be defined, and none of the functions that either
        !            78: | input or output the `floatx80' type will be defined.  The same applies to
        !            79: | the `FLOAT128' macro and the quadruple-precision format `float128'.
        !            80: *----------------------------------------------------------------------------*/
        !            81: #ifdef CONFIG_SOFTFLOAT
        !            82: /* bit exact soft float support */
        !            83: #define FLOATX80
        !            84: #define FLOAT128
        !            85: #else
        !            86: /* native float support */
        !            87: #if (defined(__i386__) || defined(__x86_64__)) && !defined(_BSD)
        !            88: #define FLOATX80
        !            89: #endif
        !            90: #endif /* !CONFIG_SOFTFLOAT */
        !            91: 
        !            92: #define STATUS_PARAM , float_status *status
        !            93: #define STATUS(field) status->field
        !            94: #define STATUS_VAR , status
        !            95: 
        !            96: /*----------------------------------------------------------------------------
        !            97: | Software IEC/IEEE floating-point ordering relations
        !            98: *----------------------------------------------------------------------------*/
        !            99: enum {
        !           100:     float_relation_less      = -1,
        !           101:     float_relation_equal     =  0,
        !           102:     float_relation_greater   =  1,
        !           103:     float_relation_unordered =  2
        !           104: };
        !           105: 
        !           106: #ifdef CONFIG_SOFTFLOAT
        !           107: /*----------------------------------------------------------------------------
        !           108: | Software IEC/IEEE floating-point types.
        !           109: *----------------------------------------------------------------------------*/
        !           110: typedef uint32_t float32;
        !           111: typedef uint64_t float64;
        !           112: #ifdef FLOATX80
        !           113: typedef struct {
        !           114:     uint64_t low;
        !           115:     uint16_t high;
        !           116: } floatx80;
        !           117: #endif
        !           118: #ifdef FLOAT128
        !           119: typedef struct {
        !           120: #ifdef WORDS_BIGENDIAN
        !           121:     uint64_t high, low;
        !           122: #else
        !           123:     uint64_t low, high;
        !           124: #endif
        !           125: } float128;
        !           126: #endif
        !           127: 
        !           128: /*----------------------------------------------------------------------------
        !           129: | Software IEC/IEEE floating-point underflow tininess-detection mode.
        !           130: *----------------------------------------------------------------------------*/
        !           131: enum {
        !           132:     float_tininess_after_rounding  = 0,
        !           133:     float_tininess_before_rounding = 1
        !           134: };
        !           135: 
        !           136: /*----------------------------------------------------------------------------
        !           137: | Software IEC/IEEE floating-point rounding mode.
        !           138: *----------------------------------------------------------------------------*/
        !           139: enum {
        !           140:     float_round_nearest_even = 0,
        !           141:     float_round_down         = 1,
        !           142:     float_round_up           = 2,
        !           143:     float_round_to_zero      = 3
        !           144: };
        !           145: 
        !           146: /*----------------------------------------------------------------------------
        !           147: | Software IEC/IEEE floating-point exception flags.
        !           148: *----------------------------------------------------------------------------*/
        !           149: enum {
        !           150:     float_flag_invalid   =  1,
        !           151:     float_flag_divbyzero =  4,
        !           152:     float_flag_overflow  =  8,
        !           153:     float_flag_underflow = 16,
        !           154:     float_flag_inexact   = 32
        !           155: };
        !           156: 
        !           157: typedef struct float_status {
        !           158:     signed char float_detect_tininess;
        !           159:     signed char float_rounding_mode;
        !           160:     signed char float_exception_flags;
        !           161: #ifdef FLOATX80
        !           162:     signed char floatx80_rounding_precision;
        !           163: #endif
        !           164: } float_status;
        !           165: 
        !           166: void set_float_rounding_mode(int val STATUS_PARAM);
        !           167: void set_float_exception_flags(int val STATUS_PARAM);
        !           168: INLINE int get_float_exception_flags(float_status *status)
        !           169: {
        !           170:     return STATUS(float_exception_flags);
        !           171: }
        !           172: #ifdef FLOATX80
        !           173: void set_floatx80_rounding_precision(int val STATUS_PARAM);
        !           174: #endif
        !           175: 
        !           176: /*----------------------------------------------------------------------------
        !           177: | Routine to raise any or all of the software IEC/IEEE floating-point
        !           178: | exception flags.
        !           179: *----------------------------------------------------------------------------*/
        !           180: void float_raise( signed char STATUS_PARAM);
        !           181: 
        !           182: /*----------------------------------------------------------------------------
        !           183: | Software IEC/IEEE integer-to-floating-point conversion routines.
        !           184: *----------------------------------------------------------------------------*/
        !           185: float32 int32_to_float32( int STATUS_PARAM );
        !           186: float64 int32_to_float64( int STATUS_PARAM );
        !           187: float32 uint32_to_float32( unsigned int STATUS_PARAM );
        !           188: float64 uint32_to_float64( unsigned int STATUS_PARAM );
        !           189: #ifdef FLOATX80
        !           190: floatx80 int32_to_floatx80( int STATUS_PARAM );
        !           191: #endif
        !           192: #ifdef FLOAT128
        !           193: float128 int32_to_float128( int STATUS_PARAM );
        !           194: #endif
        !           195: float32 int64_to_float32( int64_t STATUS_PARAM );
        !           196: float64 int64_to_float64( int64_t STATUS_PARAM );
        !           197: #ifdef FLOATX80
        !           198: floatx80 int64_to_floatx80( int64_t STATUS_PARAM );
        !           199: #endif
        !           200: #ifdef FLOAT128
        !           201: float128 int64_to_float128( int64_t STATUS_PARAM );
        !           202: #endif
        !           203: 
        !           204: /*----------------------------------------------------------------------------
        !           205: | Software IEC/IEEE single-precision conversion routines.
        !           206: *----------------------------------------------------------------------------*/
        !           207: int float32_to_int32( float32 STATUS_PARAM );
        !           208: int float32_to_int32_round_to_zero( float32 STATUS_PARAM );
        !           209: unsigned int float32_to_uint32( float32 STATUS_PARAM );
        !           210: unsigned int float32_to_uint32_round_to_zero( float32 STATUS_PARAM );
        !           211: int64_t float32_to_int64( float32 STATUS_PARAM );
        !           212: int64_t float32_to_int64_round_to_zero( float32 STATUS_PARAM );
        !           213: float64 float32_to_float64( float32 STATUS_PARAM );
        !           214: #ifdef FLOATX80
        !           215: floatx80 float32_to_floatx80( float32 STATUS_PARAM );
        !           216: #endif
        !           217: #ifdef FLOAT128
        !           218: float128 float32_to_float128( float32 STATUS_PARAM );
        !           219: #endif
        !           220: 
        !           221: /*----------------------------------------------------------------------------
        !           222: | Software IEC/IEEE single-precision operations.
        !           223: *----------------------------------------------------------------------------*/
        !           224: float32 float32_round_to_int( float32 STATUS_PARAM );
        !           225: float32 float32_add( float32, float32 STATUS_PARAM );
        !           226: float32 float32_sub( float32, float32 STATUS_PARAM );
        !           227: float32 float32_mul( float32, float32 STATUS_PARAM );
        !           228: float32 float32_div( float32, float32 STATUS_PARAM );
        !           229: float32 float32_rem( float32, float32 STATUS_PARAM );
        !           230: float32 float32_sqrt( float32 STATUS_PARAM );
        !           231: char float32_eq( float32, float32 STATUS_PARAM );
        !           232: char float32_le( float32, float32 STATUS_PARAM );
        !           233: char float32_lt( float32, float32 STATUS_PARAM );
        !           234: char float32_eq_signaling( float32, float32 STATUS_PARAM );
        !           235: char float32_le_quiet( float32, float32 STATUS_PARAM );
        !           236: char float32_lt_quiet( float32, float32 STATUS_PARAM );
        !           237: char float32_compare( float32, float32 STATUS_PARAM );
        !           238: char float32_compare_quiet( float32, float32 STATUS_PARAM );
        !           239: char float32_is_signaling_nan( float32 );
        !           240: 
        !           241: INLINE float32 float32_abs(float32 a)
        !           242: {
        !           243:     return a & 0x7fffffff;
        !           244: }
        !           245: 
        !           246: INLINE float32 float32_chs(float32 a)
        !           247: {
        !           248:     return a ^ 0x80000000;
        !           249: }
        !           250: 
        !           251: /*----------------------------------------------------------------------------
        !           252: | Software IEC/IEEE double-precision conversion routines.
        !           253: *----------------------------------------------------------------------------*/
        !           254: int float64_to_int32( float64 STATUS_PARAM );
        !           255: int float64_to_int32_round_to_zero( float64 STATUS_PARAM );
        !           256: unsigned int float64_to_uint32( float64 STATUS_PARAM );
        !           257: unsigned int float64_to_uint32_round_to_zero( float64 STATUS_PARAM );
        !           258: int64_t float64_to_int64( float64 STATUS_PARAM );
        !           259: int64_t float64_to_int64_round_to_zero( float64 STATUS_PARAM );
        !           260: float32 float64_to_float32( float64 STATUS_PARAM );
        !           261: #ifdef FLOATX80
        !           262: floatx80 float64_to_floatx80( float64 STATUS_PARAM );
        !           263: #endif
        !           264: #ifdef FLOAT128
        !           265: float128 float64_to_float128( float64 STATUS_PARAM );
        !           266: #endif
        !           267: 
        !           268: /*----------------------------------------------------------------------------
        !           269: | Software IEC/IEEE double-precision operations.
        !           270: *----------------------------------------------------------------------------*/
        !           271: float64 float64_round_to_int( float64 STATUS_PARAM );
        !           272: float64 float64_add( float64, float64 STATUS_PARAM );
        !           273: float64 float64_sub( float64, float64 STATUS_PARAM );
        !           274: float64 float64_mul( float64, float64 STATUS_PARAM );
        !           275: float64 float64_div( float64, float64 STATUS_PARAM );
        !           276: float64 float64_rem( float64, float64 STATUS_PARAM );
        !           277: float64 float64_sqrt( float64 STATUS_PARAM );
        !           278: char float64_eq( float64, float64 STATUS_PARAM );
        !           279: char float64_le( float64, float64 STATUS_PARAM );
        !           280: char float64_lt( float64, float64 STATUS_PARAM );
        !           281: char float64_eq_signaling( float64, float64 STATUS_PARAM );
        !           282: char float64_le_quiet( float64, float64 STATUS_PARAM );
        !           283: char float64_lt_quiet( float64, float64 STATUS_PARAM );
        !           284: char float64_compare( float64, float64 STATUS_PARAM );
        !           285: char float64_compare_quiet( float64, float64 STATUS_PARAM );
        !           286: char float64_is_signaling_nan( float64 );
        !           287: 
        !           288: INLINE float64 float64_abs(float64 a)
        !           289: {
        !           290:     return a & 0x7fffffffffffffffLL;
        !           291: }
        !           292: 
        !           293: INLINE float64 float64_chs(float64 a)
        !           294: {
        !           295:     return a ^ 0x8000000000000000LL;
        !           296: }
        !           297: 
        !           298: #ifdef FLOATX80
        !           299: 
        !           300: /*----------------------------------------------------------------------------
        !           301: | Software IEC/IEEE extended double-precision conversion routines.
        !           302: *----------------------------------------------------------------------------*/
        !           303: int floatx80_to_int32( floatx80 STATUS_PARAM );
        !           304: int floatx80_to_int32_round_to_zero( floatx80 STATUS_PARAM );
        !           305: int64_t floatx80_to_int64( floatx80 STATUS_PARAM );
        !           306: int64_t floatx80_to_int64_round_to_zero( floatx80 STATUS_PARAM );
        !           307: float32 floatx80_to_float32( floatx80 STATUS_PARAM );
        !           308: float64 floatx80_to_float64( floatx80 STATUS_PARAM );
        !           309: #ifdef FLOAT128
        !           310: float128 floatx80_to_float128( floatx80 STATUS_PARAM );
        !           311: #endif
        !           312: 
        !           313: /*----------------------------------------------------------------------------
        !           314: | Software IEC/IEEE extended double-precision operations.
        !           315: *----------------------------------------------------------------------------*/
        !           316: floatx80 floatx80_round_to_int( floatx80 STATUS_PARAM );
        !           317: floatx80 floatx80_add( floatx80, floatx80 STATUS_PARAM );
        !           318: floatx80 floatx80_sub( floatx80, floatx80 STATUS_PARAM );
        !           319: floatx80 floatx80_mul( floatx80, floatx80 STATUS_PARAM );
        !           320: floatx80 floatx80_div( floatx80, floatx80 STATUS_PARAM );
        !           321: floatx80 floatx80_rem( floatx80, floatx80 STATUS_PARAM );
        !           322: floatx80 floatx80_sqrt( floatx80 STATUS_PARAM );
        !           323: char floatx80_eq( floatx80, floatx80 STATUS_PARAM );
        !           324: char floatx80_le( floatx80, floatx80 STATUS_PARAM );
        !           325: char floatx80_lt( floatx80, floatx80 STATUS_PARAM );
        !           326: char floatx80_eq_signaling( floatx80, floatx80 STATUS_PARAM );
        !           327: char floatx80_le_quiet( floatx80, floatx80 STATUS_PARAM );
        !           328: char floatx80_lt_quiet( floatx80, floatx80 STATUS_PARAM );
        !           329: char floatx80_is_signaling_nan( floatx80 );
        !           330: 
        !           331: INLINE floatx80 floatx80_abs(floatx80 a)
        !           332: {
        !           333:     a.high &= 0x7fff;
        !           334:     return a;
        !           335: }
        !           336: 
        !           337: INLINE floatx80 floatx80_chs(floatx80 a)
        !           338: {
        !           339:     a.high ^= 0x8000;
        !           340:     return a;
        !           341: }
        !           342: 
        !           343: #endif
        !           344: 
        !           345: #ifdef FLOAT128
        !           346: 
        !           347: /*----------------------------------------------------------------------------
        !           348: | Software IEC/IEEE quadruple-precision conversion routines.
        !           349: *----------------------------------------------------------------------------*/
        !           350: int float128_to_int32( float128 STATUS_PARAM );
        !           351: int float128_to_int32_round_to_zero( float128 STATUS_PARAM );
        !           352: int64_t float128_to_int64( float128 STATUS_PARAM );
        !           353: int64_t float128_to_int64_round_to_zero( float128 STATUS_PARAM );
        !           354: float32 float128_to_float32( float128 STATUS_PARAM );
        !           355: float64 float128_to_float64( float128 STATUS_PARAM );
        !           356: #ifdef FLOATX80
        !           357: floatx80 float128_to_floatx80( float128 STATUS_PARAM );
        !           358: #endif
        !           359: 
        !           360: /*----------------------------------------------------------------------------
        !           361: | Software IEC/IEEE quadruple-precision operations.
        !           362: *----------------------------------------------------------------------------*/
        !           363: float128 float128_round_to_int( float128 STATUS_PARAM );
        !           364: float128 float128_add( float128, float128 STATUS_PARAM );
        !           365: float128 float128_sub( float128, float128 STATUS_PARAM );
        !           366: float128 float128_mul( float128, float128 STATUS_PARAM );
        !           367: float128 float128_div( float128, float128 STATUS_PARAM );
        !           368: float128 float128_rem( float128, float128 STATUS_PARAM );
        !           369: float128 float128_sqrt( float128 STATUS_PARAM );
        !           370: char float128_eq( float128, float128 STATUS_PARAM );
        !           371: char float128_le( float128, float128 STATUS_PARAM );
        !           372: char float128_lt( float128, float128 STATUS_PARAM );
        !           373: char float128_eq_signaling( float128, float128 STATUS_PARAM );
        !           374: char float128_le_quiet( float128, float128 STATUS_PARAM );
        !           375: char float128_lt_quiet( float128, float128 STATUS_PARAM );
        !           376: char float128_is_signaling_nan( float128 );
        !           377: 
        !           378: INLINE float128 float128_abs(float128 a)
        !           379: {
        !           380:     a.high &= 0x7fffffffffffffffLL;
        !           381:     return a;
        !           382: }
        !           383: 
        !           384: INLINE float128 float128_chs(float128 a)
        !           385: {
        !           386:     a.high ^= 0x8000000000000000LL;
        !           387:     return a;
        !           388: }
        !           389: 
        !           390: #endif
        !           391: 
        !           392: #else /* CONFIG_SOFTFLOAT */
        !           393: 
        !           394: #include "softfloat-native.h"
        !           395: 
        !           396: #endif /* !CONFIG_SOFTFLOAT */
        !           397: 
        !           398: #endif /* !SOFTFLOAT_H */

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