diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_tanhf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_tanhf.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sysdeps/libm-ieee754/s_tanhf.c b/sysdeps/libm-ieee754/s_tanhf.c index b989ef3565..2a0ca9f3df 100644 --- a/sysdeps/libm-ieee754/s_tanhf.c +++ b/sysdeps/libm-ieee754/s_tanhf.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. * ==================================================== */ @@ -40,13 +40,15 @@ static float one=1.0, two=2.0, tiny = 1.0e-30; ix = jx&0x7fffffff; /* x is INF or NaN */ - if(ix>=0x7f800000) { + if(ix>=0x7f800000) { if (jx>=0) return one/x+one; /* tanh(+-inf)=+-1 */ else return one/x-one; /* tanh(NaN) = NaN */ } /* |x| < 22 */ if (ix < 0x41b00000) { /* |x|<22 */ + if (ix == 0) + return x; /* x == +-0 */ if (ix<0x24000000) /* |x|<2**-55 */ return x*(one+x); /* tanh(small) = small */ if (ix>=0x3f800000) { /* |x|>=1 */ |