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S390: Configure check for vector support in gcc. 

The S390 specific test checks if the gcc has support for vector registers
by compiling an inline assembly which clobbers vector registers.
On success the macro HAVE_S390_VX_GCC_SUPPORT is defined.
This macro can be used to determine if e.g. clobbering vector registers
is allowed or not.

ChangeLog:

	* config.h.in (HAVE_S390_VX_GCC_SUPPORT): New macro undefine.
	* sysdeps/s390/configure.ac: Add test for S390 vector register
	support in gcc.
	* sysdeps/s390/configure: Regenerated.
This commit is contained in:
Stefan Liebler 2016-05-25 17:18:04 +02:00
parent c70e9913d2
commit 9b7f05599a
4 changed files with 64 additions and 0 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2016-05-25 Stefan Liebler <stli@linux.vnet.ibm.com>
* config.h.in (HAVE_S390_VX_GCC_SUPPORT): New macro undefine.
* sysdeps/s390/configure.ac: Add test for S390 vector register
support in gcc.
* sysdeps/s390/configure: Regenerated.
2016-05-25 Stefan Liebler <stli@linux.vnet.ibm.com>
* iconvdata/Makefile ($(inst_gconvdir)/gconv-modules):

4
config.h.in
View File

@ -73,6 +73,10 @@
/* Define if assembler supports vector instructions on S390. */
#undef HAVE_S390_VX_ASM_SUPPORT
/* Define if gcc supports vector registers as clobbers in inline assembly
on S390. */
#undef HAVE_S390_VX_GCC_SUPPORT
/* Define if assembler supports Intel MPX. */
#undef HAVE_MPX_SUPPORT

32
sysdeps/s390/configure vendored
View File

@ -144,6 +144,38 @@ else
$as_echo "$as_me: WARNING: Use binutils with vector-support in order to use optimized implementations." >&2;}
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 vector support in gcc" >&5
$as_echo_n "checking for S390 vector support in gcc... " >&6; }
if ${libc_cv_gcc_s390_vx+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.c <<\EOF
void testvecclobber ()
{
__asm__ ("" : : : "v16");
}
EOF
if { ac_try='${CC-cc} --shared conftest.c -o conftest.o &> /dev/null'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } ;
then
libc_cv_gcc_s390_vx=yes
else
libc_cv_gcc_s390_vx=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_s390_vx" >&5
$as_echo "$libc_cv_gcc_s390_vx" >&6; }
if test "$libc_cv_gcc_s390_vx" = yes ;
then
$as_echo "#define HAVE_S390_VX_GCC_SUPPORT 1" >>confdefs.h
fi
test -n "$critic_missing" && as_fn_error $? "
*** $critic_missing" "$LINENO" 5

21
sysdeps/s390/configure.ac
View File

@ -64,6 +64,27 @@ else
AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
fi
AC_CACHE_CHECK(for S390 vector support in gcc, libc_cv_gcc_s390_vx, [dnl
cat > conftest.c <<\EOF
void testvecclobber ()
{
__asm__ ("" : : : "v16");
}
EOF
dnl
dnl test, if gcc supports S390 vector registers as clobber in inline assembly
if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
then
libc_cv_gcc_s390_vx=yes
else
libc_cv_gcc_s390_vx=no
fi
rm -f conftest* ])
if test "$libc_cv_gcc_s390_vx" = yes ;
then
AC_DEFINE(HAVE_S390_VX_GCC_SUPPORT)
fi
test -n "$critic_missing" && AC_MSG_ERROR([
*** $critic_missing])