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S390: Configure check for vector support in gcc.

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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])