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authorJoseph Myers <joseph@codesourcery.com>2014-03-21 18:13:58 +0000
committerJoseph Myers <joseph@codesourcery.com>2014-03-21 18:13:58 +0000
commitf7be737659813220e1f29c8850c386a9654d549a (patch)
treec047f314e8eca5df155322e4fe9471593fb07b67 /math
parenta387428ca7330513d5f2a0924c45e6382d477052 (diff)
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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.
Diffstat (limited to 'math')
-rw-r--r--math/libm-test.inc4
1 files changed, 1 insertions, 3 deletions
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);
 }