mirror of
https://github.com/autc04/Retro68.git
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155 lines
2.6 KiB
C
155 lines
2.6 KiB
C
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#include <ansidecl.h>
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#ifdef __IEEE_BIG_ENDIAN
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typedef union
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{
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double value;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 11;
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unsigned int fraction0:4;
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unsigned int fraction1:16;
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unsigned int fraction2:16;
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unsigned int fraction3:16;
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} number;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 11;
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unsigned int quiet:1;
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unsigned int function0:3;
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unsigned int function1:16;
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unsigned int function2:16;
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unsigned int function3:16;
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} nan;
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struct
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{
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unsigned long msw;
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unsigned long lsw;
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} parts;
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long aslong[2];
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} __ieee_double_shape_type;
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#endif
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#ifdef __IEEE_LITTLE_ENDIAN
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typedef union
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{
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double value;
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struct
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{
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#ifdef __SMALL_BITFIELDS
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unsigned int fraction3:16;
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unsigned int fraction2:16;
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unsigned int fraction1:16;
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unsigned int fraction0: 4;
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#else
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unsigned int fraction1:32;
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unsigned int fraction0:20;
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#endif
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unsigned int exponent :11;
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unsigned int sign : 1;
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} number;
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struct
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{
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#ifdef __SMALL_BITFIELDS
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unsigned int function3:16;
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unsigned int function2:16;
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unsigned int function1:16;
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unsigned int function0:3;
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#else
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unsigned int function1:32;
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unsigned int function0:19;
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#endif
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unsigned int quiet:1;
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unsigned int exponent: 11;
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unsigned int sign : 1;
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} nan;
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struct
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{
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unsigned long lsw;
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unsigned long msw;
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} parts;
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long aslong[2];
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} __ieee_double_shape_type;
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#endif
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#ifdef __IEEE_BIG_ENDIAN
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typedef union
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{
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float value;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 8;
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unsigned int fraction0: 7;
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unsigned int fraction1: 16;
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} number;
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struct
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{
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unsigned int sign:1;
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unsigned int exponent:8;
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unsigned int quiet:1;
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unsigned int function0:6;
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unsigned int function1:16;
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} nan;
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long p1;
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} __ieee_float_shape_type;
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#endif
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#ifdef __IEEE_LITTLE_ENDIAN
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typedef union
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{
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float value;
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struct
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{
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unsigned int fraction0: 7;
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unsigned int fraction1: 16;
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unsigned int exponent: 8;
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unsigned int sign : 1;
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} number;
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struct
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{
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unsigned int function1:16;
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unsigned int function0:6;
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unsigned int quiet:1;
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unsigned int exponent:8;
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unsigned int sign:1;
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} nan;
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long p1;
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} __ieee_float_shape_type;
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#endif
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#if defined(__IEEE_BIG_ENDIAN) || defined(__IEEE_LITTLE_ENDIAN)
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double
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copysign (double x, double y)
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{
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__ieee_double_shape_type a,b;
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b.value = y;
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a.value = x;
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a.number.sign =b.number.sign;
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return a.value;
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}
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#else
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double
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copysign (double x, double y)
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{
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if ((x < 0 && y > 0) || (x > 0 && y < 0))
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return -x;
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return x;
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}
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#endif
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