From f7be737659813220e1f29c8850c386a9654d549a Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Fri, 21 Mar 2014 18:13:58 +0000 Subject: Fix log (1) in round-downward mode (bug 16731). 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. --- math/libm-test.inc | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'math') diff --git a/math/libm-test.inc b/math/libm-test.inc index 7abc7c14b5..5e50f0ee3d 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -7786,9 +7786,7 @@ static const struct test_f_f_data log_test_data[] = static void log_test (void) { - START (log, 0); - RUN_TEST_LOOP_f_f (log, log_test_data, ); - END; + ALL_RM_TEST (log, 0, log_test_data, RUN_TEST_LOOP_f_f, END); } -- cgit 1.4.1