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authorJoseph Myers <joseph@codesourcery.com>2014-06-24 21:00:08 +0000
committerJoseph Myers <joseph@codesourcery.com>2014-06-24 21:00:08 +0000
commit4060283decf711ed95a6c4993ffeaba39f8cd40a (patch)
treed303f8bcf7bd9fafbbb5edddc48c7c2be827f84e /sysdeps/x86_64/x32
parente7dd3c8c1db8c6d293abb995e033893b7328ad19 (diff)
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Fix x86/x86_64 expm1l spurious underflow exceptions (bug 16539).
This patch fixes bug 16539, spurious underflow exceptions from x86 / x86-64 expm1l. The problem is that the computation of a base-2 exponent with extra precision involves spurious underflows for arguments that are small but not subnormal, so a check is added to just return the argument in those cases. (If the argument *is* subnormal, underflowing is correct and the existing code will always underflow, so it suffices to keep using the existing code in that case; some expm1 implementations have a bug (bug 16353) with missing underflow exceptions, but I don't think there's such a bug in this particular version.) Tested x86_64 and x86; no ulps updates needed. (auto-libm-test-out diffs omitted below.) [BZ #16539] * sysdeps/i386/fpu/e_expl.S (IEEE754_EXPL) [USE_AS_EXPM1L]: Just return the argument for normal arguments with exponent below -64. * sysdeps/x86_64/fpu/e_expl.S (IEEE754_EXPL) [USE_AS_EXPM1L]: Likewise. * math/auto-libm-test-in: Add another test of expm1. * math/auto-libm-test-out: Regenerated.
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