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| author | Joseph Myers <joseph@codesourcery.com> | 2015-02-26 15:13:22 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-02-26 15:14:58 +0000 |
| commit | 380bd0fd2418f8988217de950f8b8ff18af0cb2b (patch) | |
| tree | abb55a322fc5e1b829761d91a23510ecfc6bf1ee /bits | |
| parent | 4a28f4d55a6cc33474c0792fe93b5942d81bf185 (diff) | |
| download | glibc-380bd0fd2418f8988217de950f8b8ff18af0cb2b.tar.gz glibc-380bd0fd2418f8988217de950f8b8ff18af0cb2b.tar.xz glibc-380bd0fd2418f8988217de950f8b8ff18af0cb2b.zip | |
Fix ldbl-128ibm logbl near powers of 2 (bug 18030).
The ldbl-128ibm implementation of logbl produces incorrect results when the high part of the argument is a power of 2 and the low part a nonzero number with the opposite sign (and so the returned exponent should be 1 less than that of the high part). For example, logbl (0x1.ffffffffffffffp1L) returns 2 but should return 1. (This is similar to (fixed) bug 16740 for frexpl, and (fixed) bug 18029 for ilogbl.) This patch adds checks for that case. Tested for powerpc. [BZ #18030] * sysdeps/ieee754/ldbl-128ibm/s_logbl.c (__logbl): Adjust exponent of power of 2 down when low part has opposite sign. * math/libm-test.inc (logb_test_data): Add more tests.
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