| /* wf_exp.c -- float version of w_exp.c. |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, [email protected]. |
| */ |
| |
| /* |
| * ==================================================== |
| * 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. |
| * ==================================================== |
| */ |
| |
| /* |
| * wrapper expf(x) |
| */ |
| |
| #include "fdlibm.h" |
| #include <errno.h> |
| |
| #ifndef _IEEE_LIBM |
| #ifdef __STDC__ |
| static const float |
| #else |
| static float |
| #endif |
| o_threshold= 8.8721679688e+01, /* 0x42b17180 */ |
| u_threshold= -1.0397208405e+02; /* 0xc2cff1b5 */ |
| #endif |
| |
| #ifdef __STDC__ |
| float expf(float x) /* wrapper expf */ |
| #else |
| float expf(x) /* wrapper expf */ |
| float x; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_expf(x); |
| #else |
| float z; |
| struct exception exc; |
| z = __ieee754_expf(x); |
| if(_LIB_VERSION == _IEEE_) return z; |
| if(finitef(x)) { |
| if(x>o_threshold) { |
| /* expf(finite) overflow */ |
| #ifndef HUGE_VAL |
| #define HUGE_VAL inf |
| double inf = 0.0; |
| |
| SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ |
| #endif |
| exc.type = OVERFLOW; |
| exc.name = "expf"; |
| exc.err = 0; |
| exc.arg1 = exc.arg2 = (double)x; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!matherr(&exc)) { |
| errno = ERANGE; |
| } |
| if (exc.err != 0) |
| errno = exc.err; |
| return exc.retval; |
| } else if(x<u_threshold) { |
| /* expf(finite) underflow */ |
| exc.type = UNDERFLOW; |
| exc.name = "expf"; |
| exc.err = 0; |
| exc.arg1 = exc.arg2 = (double)x; |
| exc.retval = 0.0; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!matherr(&exc)) { |
| errno = ERANGE; |
| } |
| if (exc.err != 0) |
| errno = exc.err; |
| return exc.retval; |
| } |
| } |
| return z; |
| #endif |
| } |
| |
| #ifdef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double exp(double x) |
| #else |
| double exp(x) |
| double x; |
| #endif |
| { |
| return (double) expf((float) x); |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |
