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Fix soft-float ldbl-128ibm atan2l signs of zero results (bug 16390). 

This patch fixes bug 16390, incorrect signs of zero results from
ldbl-128ibm atan2l, soft-float only.  The problem is a longstanding
GCC bug with fabsl not being correct for signed zero for soft float,
and the fix is using -fno-builtin-fabsl as a workaround, as already
done for various other source files.  Tested powerpc-nofpu.

	* sysdeps/powerpc/nofpu/Makefile [$(subdir) = math]
	(CFLAGS-e_atan2l.c): Use -fno-builtin-fabsl.
This commit is contained in:
Joseph Myers 2014-01-03 20:56:18 +00:00
parent 0da43124a9
commit 22562bb222
3 changed files with 8 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2014-01-03 Joseph Myers <joseph@codesourcery.com>
[BZ #16390]
* sysdeps/powerpc/nofpu/Makefile [$(subdir) = math]
(CFLAGS-e_atan2l.c): Use -fno-builtin-fabsl.
2014-01-03 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/multiarch/strcasecmp-power7.S: Remove

2
NEWS
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@ -24,7 +24,7 @@ Version 2.19
16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172, 16195, 16214,
16245, 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337,
16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385,
16386.
16386, 16390.
* Slovenian translations for glibc messages have been contributed by the
Translation Project's Slovenian team of translators.

1
sysdeps/powerpc/nofpu/Makefile
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@ -15,6 +15,7 @@ CPPFLAGS += -I../soft-fp/
# gcc-4.1.1 and may be too late for gcc-4.2. So we need these flags
# until the fix in a gcc release and glibc drops support for earlier
# versions of gcc.
CFLAGS-e_atan2l.c += -fno-builtin-fabsl
CFLAGS-e_hypotl.c += -fno-builtin-fabsl
CFLAGS-e_powl.c += -fno-builtin-fabsl
CFLAGS-s_ccoshl.c += -fno-builtin-fabsl