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Fix ctan, ctanh missing underflows (bug 18595).

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Similar to various other bugs in this area, ctan and ctanh can fail to
raise the underflow exception for some cases of results that are tiny
and inexact.  This patch forces the exception in a similar way to
previous fixes.

Tested for x86_64 and x86.

	[BZ #18595]
	* math/s_ctan.c (__ctan): Force underflow exception for results
	whose real or imaginary part has small absolute value.
	* math/s_ctanf.c (__ctanf): Likewise.
	* math/s_ctanh.c (__ctanh): Likewise.
	* math/s_ctanhf.c (__ctanhf): Likewise.
	* math/s_ctanhl.c (__ctanhl): Likewise.
	* math/s_ctanl.c (__ctanl): Likewise.
	* math/auto-libm-test-in: Do not allow missing underflow for ctan
	and ctanh.  Add more tests of ctan and ctanh.
This commit is contained in:
Joseph Myers
2015-09-15 17:46:08 +00:00
parent 694aabefd2
commit 0b87419b69
10 changed files with 923 additions and 214 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
math/s_ctanl.c
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@ -117,6 +117,16 @@ __ctanl (__complex__ long double x)
__real__ res = sinrx * cosrx / den;
__imag__ res = sinhix * coshix / den;
}
if (fabsl (__real__ res) < LDBL_MIN)
{
long double force_underflow = __real__ res * __real__ res;
math_force_eval (force_underflow);
}
if (fabsl (__imag__ res) < LDBL_MIN)
{
long double force_underflow = __imag__ res * __imag__ res;
math_force_eval (force_underflow);
}
}
return res;