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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
| commit | 7540cfc5a8c39eca9ba7b631dd30b35f6530f54d (patch) | |
| tree | c24b888cf113ef3ec9a6e55ad495a1917c6e57bb /math/w_log2f.c | |
| parent | d6cc0b4feaacf7514167cde0b3935f0c9b2c2d88 (diff) | |
| download | glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.tar.gz glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.tar.xz glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.zip | |
Fix x86 / x86_64 expl, exp10l missing underflows (bug 16361).
Similar to various other bugs in this area, the x86 and x86_64 implementations of expl / exp10l can fail to produce underflow exceptions when the unscaled result has trailing 0 bits so the scaling down to subnormal precision is exact. This patch fixes this by forcing the exception in the case of tiny results. Tested for x86_64 and x86. [BZ #16361] * sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for tiny results. * sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for tiny results. * math/auto-libm-test-in: Add more tests of exp and exp10. Do not mark underflow exceptions as possibly missing for bug 16361. * math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'math/w_log2f.c')
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