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f7be737659
According to ISO C Annex F, log (1) should be +0 in all rounding modes, but some implementations in glibc wrongly return -0 in round-downward mode (mapping to log1p (x - 1) is problematic because 1 - 1 is -0 in round-downward mode, and log1p (-0) is -0). This patch fixes this. (It helps with some implementations of other functions such as acosh, log2 and log10 that call out to log, but not enough to enable all-rounding-modes testing for those functions without further fixes to other implementations of them.) Tested x86_64 and x86 and ulps updated accordingly, and did spot tests for mips64 for the ldbl-128 fix, and i586 for the sysdeps/i386/fpu implementations shadowed by those in sysdeps/i386/i686/fpu. [BZ #16731] * sysdeps/i386/fpu/e_log.S (__ieee754_log): Take absolute value when x - 1 is zero. * sysdeps/i386/fpu/e_logf.S (__ieee754_logf): Likewise. * sysdeps/i386/fpu/e_logl.S (__ieee754_logl): Likewise. * sysdeps/i386/i686/fpu/e_logl.S (__ieee754_logl): Likewise. * sysdeps/ieee754/dbl-64/e_log.c (__ieee754_log): Return +0 when argument is 1. * sysdeps/ieee754/ldbl-128/e_logl.c (__ieee754_logl): Likewise. * sysdeps/x86_64/fpu/e_logl.S: Take absolute value when x - 1 is zero. * math/libm-test.inc (log_test): Use ALL_RM_TEST. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise. |
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| .. | ||
| fpu | ||
| multiarch | ||
| add_n.S | ||
| bcopy.S | ||
| bzero.S | ||
| cacheinfo.c | ||
| dl-hash.h | ||
| ffs.c | ||
| hp-timing.c | ||
| hp-timing.h | ||
| Implies | ||
| Makefile | ||
| memcmp.S | ||
| memcpy_chk.S | ||
| memcpy.S | ||
| memmove_chk.S | ||
| memmove.S | ||
| mempcpy_chk.S | ||
| mempcpy.S | ||
| memset_chk.S | ||
| memset.S | ||
| memusage.h | ||
| strcmp.S | ||
| strtok_r.S | ||
| strtok.S | ||
| tst-stack-align.h | ||