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ffe308e4fc
glibc/sysdeps
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Joseph Myers ffe308e4fc Fix test-math-vector-sincos.h aliasing. 
x86_64 libmvec tests have been failing to build lately with GCC
mainline with -Wuninitialized errors, and Markus Trippelsdorf traced
this to an aliasing issue
<https://sourceware.org/ml/libc-alpha/2017-03/msg00169.html>.

This patch fixes the aliasing issue, so that the vectors-of-pointers
are initialized using a union instead of pointer casts.  This also
fixes the testsuite build failures with GCC mainline.

Tested for x86_64 (full testsuite with GCC 6; testsuite build with GCC
mainline with build-many-glibcs.py).

	* sysdeps/x86/fpu/test-math-vector-sincos.h (INIT_VEC_PTRS_LOOP):
	Use a union when storing pointers.
	(VECTOR_WRAPPER_fFF_2): Do not take address of integer vector and
	cast result when passing to INIT_VEC_PTRS_LOOP.
	(VECTOR_WRAPPER_fFF_3): Likewise.
	(VECTOR_WRAPPER_fFF_4): Likewise.
2017-03-15 17:32:46 +00:00
..
aarch64 New pthread rwlock that is more scalable. 2017-01-10 11:50:17 +01:00
alpha Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
arm Update arm, mips, powerpc-nofpu libm-test-ulps. 2017-02-17 23:10:01 +00:00
generic Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
gnu Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
hppa Remove very old libm-test-ulps entries. 2017-01-20 23:58:49 +00:00
i386 Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
ia64 Allow direct use of math_ldbl.h in testsuite. 2017-02-25 10:40:48 -05:00
ieee754 Narrowing the visibility of libc-internal.h even further. 2017-03-01 20:33:46 -05:00
init_array Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
m68k m68k: fix 64bit atomic ops 2017-02-01 01:32:31 +01:00
mach hurd: Make send/recv more posixish 2017-03-13 20:41:12 +01:00
microblaze Remove very old libm-test-ulps entries. 2017-01-20 23:58:49 +00:00
mips Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
nacl Narrowing the visibility of libc-internal.h even further. 2017-03-01 20:33:46 -05:00
nios2 New pthread rwlock that is more scalable. 2017-01-10 11:50:17 +01:00
nptl Narrowing the visibility of libc-internal.h even further. 2017-03-01 20:33:46 -05:00
posix Remove the str(n)dup inlines from string/bits/string2.h. Although inlining 2017-03-13 18:45:42 +00:00
powerpc Miscellaneous low-risk changes preparing for _ISOMAC testsuite. 2017-03-01 20:32:50 -05:00
pthread Refer to <signal.h> instead of <pthread.h> in <bits/sigthread.h> 2017-02-28 10:34:15 +01:00
s390 Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
sh sh: Fix building with gcc5/6 2017-03-12 17:29:32 -03:00
sparc Remove _dl_platform_string 2017-03-14 17:18:52 +01:00
tile tile: Check for pointer add overflow in memchr 2017-01-16 15:44:48 -05:00
unix Fix missing posix_fadvise64 mips64 static build (BZ #21232) 2017-03-14 16:42:08 -03:00
wordsize-32 Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
wordsize-64 Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
x86 Fix test-math-vector-sincos.h aliasing. 2017-03-15 17:32:46 +00:00
x86_64 Document and fix --enable-bind-now [BZ #21015] 2017-03-02 14:44:28 +01:00