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Diffstat (limited to 'softfloat/softfloat-specialize')
| -rw-r--r-- | softfloat/softfloat-specialize | 412 |
1 files changed, 0 insertions, 412 deletions
diff --git a/softfloat/softfloat-specialize b/softfloat/softfloat-specialize deleted file mode 100644 index 28bd4fe..0000000 --- a/softfloat/softfloat-specialize +++ /dev/null @@ -1,412 +0,0 @@ - -/*============================================================================ - -This C source fragment is part of the SoftFloat IEC/IEEE Floating-point -Arithmetic Package, Release 2b. - -Written by John R. Hauser. This work was made possible in part by the -International Computer Science Institute, located at Suite 600, 1947 Center -Street, Berkeley, California 94704. Funding was partially provided by the -National Science Foundation under grant MIP-9311980. The original version -of this code was written as part of a project to build a fixed-point vector -processor in collaboration with the University of California at Berkeley, -overseen by Profs. Nelson Morgan and John Wawrzynek. More information -is available through the Web page `http://www.cs.berkeley.edu/~jhauser/ -arithmetic/SoftFloat.html'. - -THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has -been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES -RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS -AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES, -COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE -EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE -INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR -OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE. - -Derivative works are acceptable, even for commercial purposes, so long as -(1) the source code for the derivative work includes prominent notice that -the work is derivative, and (2) the source code includes prominent notice with -these four paragraphs for those parts of this code that are retained. - -=============================================================================*/ - -/*---------------------------------------------------------------------------- -| Underflow tininess-detection mode, statically initialized to default value. -| (The declaration in `softfloat.h' must match the `int8' type here.) -*----------------------------------------------------------------------------*/ -int8 float_detect_tininess = float_tininess_before_rounding; - -/*---------------------------------------------------------------------------- -| Raises the exceptions specified by `flags'. Floating-point traps can be -| defined here if desired. It is currently not possible for such a trap -| to substitute a result value. If traps are not implemented, this routine -| should be simply `float_exception_flags |= flags;'. -*----------------------------------------------------------------------------*/ - -void float_raise( int8 flags ) -{ - - float_exception_flags |= flags; - -} - -/*---------------------------------------------------------------------------- -| Internal canonical NaN format. -*----------------------------------------------------------------------------*/ -typedef struct { - flag sign; - bits64 high, low; -} commonNaNT; - -/*---------------------------------------------------------------------------- -| The pattern for a default generated single-precision NaN. -*----------------------------------------------------------------------------*/ -#define float32_default_nan 0x7FFFFFFF - -/*---------------------------------------------------------------------------- -| Returns 1 if the single-precision floating-point value `a' is a NaN; -| otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float32_is_nan( float32 a ) -{ - - return ( 0xFF000000 < (bits32) ( a<<1 ) ); - -} - -/*---------------------------------------------------------------------------- -| Returns 1 if the single-precision floating-point value `a' is a signaling -| NaN; otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float32_is_signaling_nan( float32 a ) -{ - - return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the single-precision floating-point NaN -| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid -| exception is raised. -*----------------------------------------------------------------------------*/ - -static commonNaNT float32ToCommonNaN( float32 a ) -{ - commonNaNT z; - - if ( float32_is_signaling_nan( a ) ) float_raise( float_flag_invalid ); - z.sign = a>>31; - z.low = 0; - z.high = ( (bits64) a )<<41; - return z; - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the canonical NaN `a' to the single- -| precision floating-point format. -*----------------------------------------------------------------------------*/ - -static float32 commonNaNToFloat32( commonNaNT a ) -{ - - return ( ( (bits32) a.sign )<<31 ) | 0x7FC00000 | ( a.high>>41 ); - -} - -/*---------------------------------------------------------------------------- -| Takes two single-precision floating-point values `a' and `b', one of which -| is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a -| signaling NaN, the invalid exception is raised. -*----------------------------------------------------------------------------*/ - -static float32 propagateFloat32NaN( float32 a, float32 b ) -{ - flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN; - - aIsNaN = float32_is_nan( a ); - aIsSignalingNaN = float32_is_signaling_nan( a ); - bIsNaN = float32_is_nan( b ); - bIsSignalingNaN = float32_is_signaling_nan( b ); - a |= 0x00400000; - b |= 0x00400000; - if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid ); - return bIsSignalingNaN ? b : aIsSignalingNaN ? a : bIsNaN ? b : a; - -} - -/*---------------------------------------------------------------------------- -| The pattern for a default generated double-precision NaN. -*----------------------------------------------------------------------------*/ -#define float64_default_nan LIT64( 0x7FFFFFFFFFFFFFFF ) - -/*---------------------------------------------------------------------------- -| Returns 1 if the double-precision floating-point value `a' is a NaN; -| otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float64_is_nan( float64 a ) -{ - - return ( LIT64( 0xFFE0000000000000 ) < (bits64) ( a<<1 ) ); - -} - -/*---------------------------------------------------------------------------- -| Returns 1 if the double-precision floating-point value `a' is a signaling -| NaN; otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float64_is_signaling_nan( float64 a ) -{ - - return - ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) - && ( a & LIT64( 0x0007FFFFFFFFFFFF ) ); - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the double-precision floating-point NaN -| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid -| exception is raised. -*----------------------------------------------------------------------------*/ - -static commonNaNT float64ToCommonNaN( float64 a ) -{ - commonNaNT z; - - if ( float64_is_signaling_nan( a ) ) float_raise( float_flag_invalid ); - z.sign = a>>63; - z.low = 0; - z.high = a<<12; - return z; - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the canonical NaN `a' to the double- -| precision floating-point format. -*----------------------------------------------------------------------------*/ - -static float64 commonNaNToFloat64( commonNaNT a ) -{ - - return - ( ( (bits64) a.sign )<<63 ) - | LIT64( 0x7FF8000000000000 ) - | ( a.high>>12 ); - -} - -/*---------------------------------------------------------------------------- -| Takes two double-precision floating-point values `a' and `b', one of which -| is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a -| signaling NaN, the invalid exception is raised. -*----------------------------------------------------------------------------*/ - -static float64 propagateFloat64NaN( float64 a, float64 b ) -{ - flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN; - - aIsNaN = float64_is_nan( a ); - aIsSignalingNaN = float64_is_signaling_nan( a ); - bIsNaN = float64_is_nan( b ); - bIsSignalingNaN = float64_is_signaling_nan( b ); - a |= LIT64( 0x0008000000000000 ); - b |= LIT64( 0x0008000000000000 ); - if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid ); - return bIsSignalingNaN ? b : aIsSignalingNaN ? a : bIsNaN ? b : a; - -} - -#ifdef FLOATX80 - -/*---------------------------------------------------------------------------- -| The pattern for a default generated extended double-precision NaN. The -| `high' and `low' values hold the most- and least-significant bits, -| respectively. -*----------------------------------------------------------------------------*/ -#define floatx80_default_nan_high 0x7FFF -#define floatx80_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF ) - -/*---------------------------------------------------------------------------- -| Returns 1 if the extended double-precision floating-point value `a' is a -| NaN; otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag floatx80_is_nan( floatx80 a ) -{ - - return ( ( a.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( a.low<<1 ); - -} - -/*---------------------------------------------------------------------------- -| Returns 1 if the extended double-precision floating-point value `a' is a -| signaling NaN; otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag floatx80_is_signaling_nan( floatx80 a ) -{ - bits64 aLow; - - aLow = a.low & ~ LIT64( 0x4000000000000000 ); - return - ( ( a.high & 0x7FFF ) == 0x7FFF ) - && (bits64) ( aLow<<1 ) - && ( a.low == aLow ); - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the extended double-precision floating- -| point NaN `a' to the canonical NaN format. If `a' is a signaling NaN, the -| invalid exception is raised. -*----------------------------------------------------------------------------*/ - -static commonNaNT floatx80ToCommonNaN( floatx80 a ) -{ - commonNaNT z; - - if ( floatx80_is_signaling_nan( a ) ) float_raise( float_flag_invalid ); - z.sign = a.high>>15; - z.low = 0; - z.high = a.low<<1; - return z; - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the canonical NaN `a' to the extended -| double-precision floating-point format. -*----------------------------------------------------------------------------*/ - -static floatx80 commonNaNToFloatx80( commonNaNT a ) -{ - floatx80 z; - - z.low = LIT64( 0xC000000000000000 ) | ( a.high>>1 ); - z.high = ( ( (bits16) a.sign )<<15 ) | 0x7FFF; - return z; - -} - -/*---------------------------------------------------------------------------- -| Takes two extended double-precision floating-point values `a' and `b', one -| of which is a NaN, and returns the appropriate NaN result. If either `a' or -| `b' is a signaling NaN, the invalid exception is raised. -*----------------------------------------------------------------------------*/ - -static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b ) -{ - flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN; - - aIsNaN = floatx80_is_nan( a ); - aIsSignalingNaN = floatx80_is_signaling_nan( a ); - bIsNaN = floatx80_is_nan( b ); - bIsSignalingNaN = floatx80_is_signaling_nan( b ); - a.low |= LIT64( 0xC000000000000000 ); - b.low |= LIT64( 0xC000000000000000 ); - if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid ); - return bIsSignalingNaN ? b : aIsSignalingNaN ? a : bIsNaN ? b : a; - -} - -#endif - -#ifdef FLOAT128 - -/*---------------------------------------------------------------------------- -| The pattern for a default generated quadruple-precision NaN. The `high' and -| `low' values hold the most- and least-significant bits, respectively. -*----------------------------------------------------------------------------*/ -#define float128_default_nan_high LIT64( 0x7FFFFFFFFFFFFFFF ) -#define float128_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF ) - -/*---------------------------------------------------------------------------- -| Returns 1 if the quadruple-precision floating-point value `a' is a NaN; -| otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float128_is_nan( float128 a ) -{ - - return - ( LIT64( 0xFFFE000000000000 ) <= (bits64) ( a.high<<1 ) ) - && ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) ); - -} - -/*---------------------------------------------------------------------------- -| Returns 1 if the quadruple-precision floating-point value `a' is a -| signaling NaN; otherwise returns 0. -*----------------------------------------------------------------------------*/ - -flag float128_is_signaling_nan( float128 a ) -{ - - return - ( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE ) - && ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) ); - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the quadruple-precision floating-point NaN -| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid -| exception is raised. -*----------------------------------------------------------------------------*/ - -static commonNaNT float128ToCommonNaN( float128 a ) -{ - commonNaNT z; - - if ( float128_is_signaling_nan( a ) ) float_raise( float_flag_invalid ); - z.sign = a.high>>63; - shortShift128Left( a.high, a.low, 16, &z.high, &z.low ); - return z; - -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the canonical NaN `a' to the quadruple- -| precision floating-point format. -*----------------------------------------------------------------------------*/ - -static float128 commonNaNToFloat128( commonNaNT a ) -{ - float128 z; - - shift128Right( a.high, a.low, 16, &z.high, &z.low ); - z.high |= ( ( (bits64) a.sign )<<63 ) | LIT64( 0x7FFF800000000000 ); - return z; - -} - -/*---------------------------------------------------------------------------- -| Takes two quadruple-precision floating-point values `a' and `b', one of -| which is a NaN, and returns the appropriate NaN result. If either `a' or -| `b' is a signaling NaN, the invalid exception is raised. -*----------------------------------------------------------------------------*/ - -static float128 propagateFloat128NaN( float128 a, float128 b ) -{ - flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN; - - aIsNaN = float128_is_nan( a ); - aIsSignalingNaN = float128_is_signaling_nan( a ); - bIsNaN = float128_is_nan( b ); - bIsSignalingNaN = float128_is_signaling_nan( b ); - a.high |= LIT64( 0x0000800000000000 ); - b.high |= LIT64( 0x0000800000000000 ); - if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid ); - return bIsSignalingNaN ? b : aIsSignalingNaN ? a : bIsNaN ? b : a; - -} - -#endif - |