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GNU C Library master sources branch, master, updated. glibc-2.15-1174-g10285c2
- From: jsm28 at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 15 Jun 2012 11:28:04 -0000
- Subject: GNU C Library master sources branch, master, updated. glibc-2.15-1174-g10285c2
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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=10285c21134b280457094a6acaa9341862bc65ef
commit 10285c21134b280457094a6acaa9341862bc65ef
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Jun 15 11:27:51 2012 +0000
Fix pow (0.0, -Inf) (bug 14241).
diff --git a/ChangeLog b/ChangeLog
index f632292..f066a88 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2012-06-15 Joseph Myers <joseph@codesourcery.com>
+
+ [BZ #14241]
+ * sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use 0.0 instead
+ of ABS(x) in calculating zero to negative powers other than odd
+ integers.
+ * math/libm-test.inc (pow_test): Add more tests.
+
2012-06-15 Andreas Jaeger <aj@suse.de>
* manual/contrib.texi (Contributors): Update entry of Liubov
diff --git a/NEWS b/NEWS
index 91b2644..96b351c 100644
--- a/NEWS
+++ b/NEWS
@@ -29,7 +29,7 @@ Version 2.16
13963, 13967, 13968, 13970, 13973, 13979, 13983, 13986, 13996, 14012,
14027, 14033, 14034, 14036, 14040, 14043, 14044, 14048, 14049, 14053,
14055, 14059, 14064, 14075, 14080, 14083, 14103, 14104, 14109, 14112,
- 14122, 14123, 14134, 14153, 14183, 14188, 14199, 14210, 14218
+ 14122, 14123, 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14241
* Support for the x32 ABI on x86-64 added. The x32 target is selected by
configuring glibc with:
diff --git a/math/libm-test.inc b/math/libm-test.inc
index d32dde3..8e4d02e 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -6290,6 +6290,8 @@ pow_test (void)
TEST_ff_f (pow, minus_zero, 11.1L, 0);
TEST_ff_f (pow, 0, plus_infty, 0);
TEST_ff_f (pow, minus_zero, plus_infty, 0);
+ TEST_ff_f (pow, 0, minus_infty, plus_infty, DIVIDE_BY_ZERO_EXCEPTION_OK);
+ TEST_ff_f (pow, minus_zero, minus_infty, plus_infty, DIVIDE_BY_ZERO_EXCEPTION_OK);
#ifndef TEST_INLINE
/* pow (x, +inf) == +inf for |x| > 1. */
diff --git a/sysdeps/ieee754/dbl-64/e_pow.c b/sysdeps/ieee754/dbl-64/e_pow.c
index 6c41af9..3fd5e65 100644
--- a/sysdeps/ieee754/dbl-64/e_pow.c
+++ b/sysdeps/ieee754/dbl-64/e_pow.c
@@ -112,12 +112,12 @@ __ieee754_pow(double x, double y) {
if (((v.i[HIGH_HALF] & 0x7fffffff) == 0x7ff00000 && v.i[LOW_HALF] != 0)
|| (v.i[HIGH_HALF] & 0x7fffffff) > 0x7ff00000)
return y;
- if (ABS(y) > 1.0e20) return (y>0)?0:1.0/ABS(x);
+ if (ABS(y) > 1.0e20) return (y>0)?0:1.0/0.0;
k = checkint(y);
if (k == -1)
return y < 0 ? 1.0/x : x;
else
- return y < 0 ? 1.0/ABS(x) : 0.0; /* return 0 */
+ return y < 0 ? 1.0/0.0 : 0.0; /* return 0 */
}
qx = u.i[HIGH_HALF]&0x7fffffff; /* no sign */
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 8 ++++++++
NEWS | 2 +-
math/libm-test.inc | 2 ++
sysdeps/ieee754/dbl-64/e_pow.c | 4 ++--
4 files changed, 13 insertions(+), 3 deletions(-)
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