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author | Joseph Myers <joseph@codesourcery.com> | 2014-06-29 11:49:08 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2014-06-29 11:49:08 +0000 |
commit | edea402804bce917cfd7cd1af76212e6364c23db (patch) | |
tree | d7688292b5b41de2f5707affccea4b992db30df2 /LICENSES | |
parent | dd0ba018122e88937a5f14b6594b9a40693b2e58 (diff) | |
download | glibc-edea402804bce917cfd7cd1af76212e6364c23db.tar.gz glibc-edea402804bce917cfd7cd1af76212e6364c23db.tar.xz glibc-edea402804bce917cfd7cd1af76212e6364c23db.zip |
Fix ldbl-128 powl sign of result in overflow / underflow cases (bug 17097).
This patch fixes bug 17097, ldbl-128 powl producing overflowing / underflowing results with positive sign when the result should have been negative. This was shown up by the tests in non-default rounding modes added by my patch for bug 16315, but isn't actually limited to non-default rounding modes: rather, when rounding to nearest the wrappers produced a result with the correct sign and so always hid the bug unless -lieee was used to disable the wrappers. The problem is that in the cases where Y is large enough that the result overflows or underflows for X not very close to 1, but not large enough to overflow or underflow for all X != +/- 1 (in the latter case Y is always an even integer), a positive overflowing / underflowing result is always returned, rather than one with the correct sign. This patch moves the relevant part of computation of the sign earlier and returns a result of the correct sign. Tested for mips64. [BZ #17097] * sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Return result with correct sign in case of exponents that produce overflow except for X very close to 1.
Diffstat (limited to 'LICENSES')
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