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From 29f8926b153d59ba18f67ce5445dce66bacc0cbf Mon Sep 17 00:00:00 2001
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From: Stefan Liebler <stli@linux.vnet.ibm.com>
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Date: Mon, 7 Nov 2016 15:25:04 +0100
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Subject: [PATCH 02/17] S390: Configure check for vector support in gcc.
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Upstream commit 9b7f05599a92dead97d6683bc838a57bc63ac52b
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The S390 specific test checks if the gcc has support for vector registers
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by compiling an inline assembly which clobbers vector registers.
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On success the macro HAVE_S390_VX_GCC_SUPPORT is defined.
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This macro can be used to determine if e.g. clobbering vector registers
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is allowed or not.
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ChangeLog:
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* config.h.in (HAVE_S390_VX_GCC_SUPPORT): New macro undefine.
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* sysdeps/s390/configure.in: Add test for S390 vector register
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support in gcc.
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* sysdeps/s390/configure: Regenerated.
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---
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config.h.in | 4 ++++
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sysdeps/s390/configure | 33 +++++++++++++++++++++++++++++++++
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sysdeps/s390/configure.in | 22 ++++++++++++++++++++++
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3 files changed, 59 insertions(+)
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diff --git a/config.h.in b/config.h.in
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index f7f2388..62e04c7 100644
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--- a/config.h.in
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+++ b/config.h.in
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@@ -113,6 +113,10 @@
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/* Define if assembler supports vector instructions on S390. */
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#undef HAVE_S390_VX_ASM_SUPPORT
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+/* Define if gcc supports vector registers as clobbers in inline assembly
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+ on S390. */
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+#undef HAVE_S390_VX_GCC_SUPPORT
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+
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/* Define if gcc supports FMA4. */
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#undef HAVE_FMA4_SUPPORT
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diff --git a/sysdeps/s390/configure b/sysdeps/s390/configure
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index cc4c1e0..eb49a4c 100644
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--- a/sysdeps/s390/configure
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+++ b/sysdeps/s390/configure
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@@ -42,3 +42,36 @@ else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Use binutils with vector-support in order to use optimized implementations." >&5
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$as_echo "$as_me: WARNING: Use binutils with vector-support in order to use optimized implementations." >&2;}
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fi
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+
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 vector support in gcc" >&5
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+$as_echo_n "checking for S390 vector support in gcc... " >&6; }
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+if ${libc_cv_gcc_s390_vx+:} false; then :
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+ $as_echo_n "(cached) " >&6
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+else
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+ cat > conftest.c <<\EOF
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+void testvecclobber ()
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+{
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+ __asm__ ("" : : : "v16");
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+}
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+EOF
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+if { ac_try='${CC-cc} --shared conftest.c -o conftest.o &> /dev/null'
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+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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+ (eval $ac_try) 2>&5
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+ ac_status=$?
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+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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+ test $ac_status = 0; }; } ;
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+then
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+ libc_cv_gcc_s390_vx=yes
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+else
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+ libc_cv_gcc_s390_vx=no
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+fi
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+rm -f conftest*
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_s390_vx" >&5
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+$as_echo "$libc_cv_gcc_s390_vx" >&6; }
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+
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+if test "$libc_cv_gcc_s390_vx" = yes ;
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+then
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+ $as_echo "#define HAVE_S390_VX_GCC_SUPPORT 1" >>confdefs.h
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+
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+fi
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diff --git a/sysdeps/s390/configure.in b/sysdeps/s390/configure.in
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index 733e356..a3b1f25 100644
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--- a/sysdeps/s390/configure.in
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+++ b/sysdeps/s390/configure.in
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@@ -31,3 +31,25 @@ then
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else
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AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
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fi
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+
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+AC_CACHE_CHECK(for S390 vector support in gcc, libc_cv_gcc_s390_vx, [dnl
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+cat > conftest.c <<\EOF
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+void testvecclobber ()
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+{
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+ __asm__ ("" : : : "v16");
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+}
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+EOF
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+dnl
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+dnl test, if gcc supports S390 vector registers as clobber in inline assembly
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+if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
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+then
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+ libc_cv_gcc_s390_vx=yes
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+else
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+ libc_cv_gcc_s390_vx=no
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+fi
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+rm -f conftest* ])
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+
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+if test "$libc_cv_gcc_s390_vx" = yes ;
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+then
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+ AC_DEFINE(HAVE_S390_VX_GCC_SUPPORT)
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+fi
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--
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1.8.3.1
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