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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [common/] [sf_scalbln.c] - Rev 179
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/* s_scalbnf.c -- float version of s_scalbn.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #include "fdlibm.h" #ifdef __STDC__ static const float #else static float #endif two25 = 3.355443200e+07, /* 0x4c000000 */ twom25 = 2.9802322388e-08, /* 0x33000000 */ huge = 1.0e+30, tiny = 1.0e-30; #ifdef __STDC__ float scalblnf (float x, long int n) #else float scalblnf (x,n) float x; long int n; #endif { __int32_t k,ix; GET_FLOAT_WORD(ix,x); k = (ix&0x7f800000)>>23; /* extract exponent */ if (k==0) { /* 0 or subnormal x */ if ((ix&0x7fffffff)==0) return x; /* +-0 */ x *= two25; GET_FLOAT_WORD(ix,x); k = ((ix&0x7f800000)>>23) - 25; } if (k==0xff) return x+x; /* NaN or Inf */ k = k+n; if (n> 50000 || k > 0xfe) return huge*copysignf(huge,x); /* overflow */ if (n< -50000) return tiny*copysignf(tiny,x); /*underflow*/ if (k > 0) /* normal result */ {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;} if (k <= -25) return tiny*copysignf(tiny,x); /*underflow*/ k += 25; /* subnormal result */ SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x*twom25; } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double scalbln (double x, long int n) #else double scalbln (x,n) double x; long int n; #endif { return (double) scalblnf((float) x, n); } #endif /* defined(_DOUBLE_IS_32BITS) */
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