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Fix a corner case: tan(large + Inf i) == NaN + NaN i.

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This commit is contained in:
David Schultz 2011-10-21 06:30:16 +00:00
parent c6df46bafb
commit bc23acdc32
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=226600
2 changed files with 10 additions and 0 deletions
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7
lib/msun/src/s_ctanh.c
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@ -107,6 +107,13 @@ ctanh(double complex z)
return (cpack(x, copysign(0, isinf(y) ? y : sin(y) * cos(y))));
}
/*
* ctanh(x + i NAN) = NaN + i NaN
* ctanh(x +- i Inf) = NaN + i NaN
*/
if (!isfinite(y))
return (cpack(y - y, y - y));
/*
* ctanh(+-huge + i +-y) ~= +-1 +- i 2sin(2y)/exp(2x), using the
* approximation sinh^2(huge) ~= exp(2*huge) / 4.

3
lib/msun/src/s_ctanhf.c
View File

@ -57,6 +57,9 @@ ctanhf(float complex z)
copysignf(0, isinf(y) ? y : sinf(y) * cosf(y))));
}
if (!isfinite(y))
return (cpackf(y - y, y - y));
if (ix >= 0x41300000) { /* x >= 11 */
float exp_mx = expf(-fabsf(x));
return (cpackf(copysignf(1, x),