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authorJoseph Myers <joseph@codesourcery.com>2015-06-29 17:51:32 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-06-29 17:51:32 +0000
commit4aa10d01b654b7395c6e856b8e1e0959cfc80739 (patch)
tree01a52e164acecacf0e5b0e1851740d5defcd9d34 /sysdeps/i386
parent63dbe5f32238858c7b953b867ed0588c7808dd4f (diff)
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Fix ldbl-128 j1l spurious underflows (bug 18612).
The ldbl-128 implementation of j1l produces spurious underflow
exceptions for some small arguments, as a result of squaring the
argument.  This patch fixes it just to use a linear approximation for
sufficiently small arguments, and then to force an underflow exception
only in the cases where it is required.

Tested for mips64.

	[BZ #18612]
	* sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_j1l): For small
	arguments, just return 0.5 times the argument, with underflow
	forced as needed.
	* math/auto-libm-test-in: Add more tests of j1.
	* math/auto-libm-test-out: Regenerated.
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