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| author | Joseph Myers <joseph@codesourcery.com> | 2015-08-19 22:42:01 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2015-08-19 22:42:01 +0000 |
| commit | 948e12a238715b2931cc42486db9e502ff943e54 (patch) | |
| tree | c0790fb5b46d6a49e015f15cbec9c45464dd1dc2 /io | |
| parent | b75d1cfce647df871700a9027cde35484127d727 (diff) | |
| download | glibc-948e12a238715b2931cc42486db9e502ff943e54.tar.gz glibc-948e12a238715b2931cc42486db9e502ff943e54.tar.xz glibc-948e12a238715b2931cc42486db9e502ff943e54.zip | |
Fix csqrt missing underflows (bug 18370).
The csqrt implementations in glibc can miss underflow exceptions when the real or imaginary part of the result becomes tiny in the course of scaling down (in particular, multiplication by 0.5) and that scaling is exact although the relevant part of the mathematical result isn't. This patch forces the exception in a similar way to previous fixes. Tested for x86_64 and x86. [BZ #18370] * math/s_csqrt.c (__csqrt): Force underflow exception for results whose real or imaginary part has small absolute value. * math/s_csqrtf.c (__csqrtf): Likewise. * math/s_csqrtl.c (__csqrtl): Likewise. * math/auto-libm-test-in: Add more tests of csqrt. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
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