Mercurial > hg > CbC > CbC_gcc
diff libiberty/copysign.c @ 0:a06113de4d67
first commit
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libiberty/copysign.c Fri Jul 17 14:47:48 2009 +0900 @@ -0,0 +1,154 @@ +#include <ansidecl.h> + +#ifdef __IEEE_BIG_ENDIAN + +typedef union +{ + double value; + struct + { + unsigned int sign : 1; + unsigned int exponent: 11; + unsigned int fraction0:4; + unsigned int fraction1:16; + unsigned int fraction2:16; + unsigned int fraction3:16; + + } number; + struct + { + unsigned int sign : 1; + unsigned int exponent: 11; + unsigned int quiet:1; + unsigned int function0:3; + unsigned int function1:16; + unsigned int function2:16; + unsigned int function3:16; + } nan; + struct + { + unsigned long msw; + unsigned long lsw; + } parts; + long aslong[2]; +} __ieee_double_shape_type; + +#endif + +#ifdef __IEEE_LITTLE_ENDIAN + +typedef union +{ + double value; + struct + { +#ifdef __SMALL_BITFIELDS + unsigned int fraction3:16; + unsigned int fraction2:16; + unsigned int fraction1:16; + unsigned int fraction0: 4; +#else + unsigned int fraction1:32; + unsigned int fraction0:20; +#endif + unsigned int exponent :11; + unsigned int sign : 1; + } number; + struct + { +#ifdef __SMALL_BITFIELDS + unsigned int function3:16; + unsigned int function2:16; + unsigned int function1:16; + unsigned int function0:3; +#else + unsigned int function1:32; + unsigned int function0:19; +#endif + unsigned int quiet:1; + unsigned int exponent: 11; + unsigned int sign : 1; + } nan; + struct + { + unsigned long lsw; + unsigned long msw; + } parts; + + long aslong[2]; + +} __ieee_double_shape_type; + +#endif + +#ifdef __IEEE_BIG_ENDIAN +typedef union +{ + float value; + struct + { + unsigned int sign : 1; + unsigned int exponent: 8; + unsigned int fraction0: 7; + unsigned int fraction1: 16; + } number; + struct + { + unsigned int sign:1; + unsigned int exponent:8; + unsigned int quiet:1; + unsigned int function0:6; + unsigned int function1:16; + } nan; + long p1; + +} __ieee_float_shape_type; +#endif + +#ifdef __IEEE_LITTLE_ENDIAN +typedef union +{ + float value; + struct + { + unsigned int fraction0: 7; + unsigned int fraction1: 16; + unsigned int exponent: 8; + unsigned int sign : 1; + } number; + struct + { + unsigned int function1:16; + unsigned int function0:6; + unsigned int quiet:1; + unsigned int exponent:8; + unsigned int sign:1; + } nan; + long p1; + +} __ieee_float_shape_type; +#endif + +#if defined(__IEEE_BIG_ENDIAN) || defined(__IEEE_LITTLE_ENDIAN) + +double +copysign (double x, double y) +{ + __ieee_double_shape_type a,b; + b.value = y; + a.value = x; + a.number.sign =b.number.sign; + return a.value; +} + +#else + +double +copysign (double x, double y) +{ + if ((x < 0 && y > 0) || (x > 0 && y < 0)) + return -x; + return x; +} + +#endif