diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_erff.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_erff.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/sysdeps/ieee754/flt-32/s_erff.c b/sysdeps/ieee754/flt-32/s_erff.c index 17eeca4b51..7c09589648 100644 --- a/sysdeps/ieee754/flt-32/s_erff.c +++ b/sysdeps/ieee754/flt-32/s_erff.c @@ -8,7 +8,7 @@ * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice + * software is freely granted, provided that this notice * is preserved. * ==================================================== */ @@ -17,6 +17,8 @@ static char rcsid[] = "$NetBSD: s_erff.c,v 1.4 1995/05/10 20:47:07 jtc Exp $"; #endif +#include <errno.h> +#include <float.h> #include <math.h> #include <math_private.h> @@ -43,7 +45,7 @@ qq3 = 5.0813062117e-03, /* 0x3ba68116 */ qq4 = 1.3249473704e-04, /* 0x390aee49 */ qq5 = -3.9602282413e-06, /* 0xb684e21a */ /* - * Coefficients for approximation to erf in [0.84375,1.25] + * Coefficients for approximation to erf in [0.84375,1.25] */ pa0 = -2.3621185683e-03, /* 0xbb1acdc6 */ pa1 = 4.1485610604e-01, /* 0x3ed46805 */ @@ -108,7 +110,7 @@ float __erff(float x) if(ix < 0x3f580000) { /* |x|<0.84375 */ if(ix < 0x31800000) { /* |x|<2**-28 */ - if (ix < 0x04000000) + if (ix < 0x04000000) /*avoid underflow */ return (float)0.125*((float)8.0*x+efx8*x); return x + efx*x; @@ -179,7 +181,7 @@ float __erfcf(float x) P = pa0+s*(pa1+s*(pa2+s*(pa3+s*(pa4+s*(pa5+s*pa6))))); Q = one+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6))))); if(hx>=0) { - z = one-erx; return z - P/Q; + z = one-erx; return z - P/Q; } else { z = erx+P/Q; return one+z; } @@ -203,9 +205,22 @@ float __erfcf(float x) SET_FLOAT_WORD(z,ix&0xffffe000); r = __ieee754_expf(-z*z-(float)0.5625)* __ieee754_expf((z-x)*(z+x)+R/S); - if(hx>0) return r/x; else return two-r/x; + if(hx>0) { +#if FLT_EVAL_METHOD != 0 + volatile +#endif + float ret = r/x; + if (ret == 0) + __set_errno (ERANGE); + return ret; + } else + return two-r/x; } else { - if(hx>0) return tiny*tiny; else return two-tiny; + if(hx>0) { + __set_errno (ERANGE); + return tiny*tiny; + } else + return two-tiny; } } weak_alias (__erfcf, erfcf) |