From 2d04109858181ed8c7dc3e4ae42923a26c1d3591 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Thu, 8 Oct 2015 10:47:37 +0200
Subject: [PATCH 08/30] S390: configure check for vector instruction support in
assembler.
upstream-commit-id: 4f0a1cea34c05fb2acc16f1a2d291f53230eb4fb
https://www.sourceware.org/ml/libc-alpha/2015-07/msg00153.html
The S390 specific test checks if the assembler has support for the new z13
vector instructions by compiling a vector instruction. The .machine and
.machinemode directives are needed to compile the vector instruction without
-march=z13 option on 31/64 bit.
On success the macro HAVE_S390_VX_ASM_SUPPORT is defined. This macro is used
to determine if the optimized functions can be build without compile errors.
If the used assembler lacks vector support, then a warning is dumped while
configuring and only the common code functions are build.
The z13 instruction support was introduced in
"[Committed] S/390: Add support for IBM z13."
(https://sourceware.org/ml/binutils/2015-01/msg00197.html)
ChangeLog:
* config.h.in (HAVE_S390_VX_ASM_SUPPORT): New macro undefine.
* sysdeps/s390/configure.ac: Add test for S390 vector instruction
assembler support.
* sysdeps/s390/configure: Regenerated.
---
config.h.in | 3 +++
sysdeps/s390/configure | 39 +++++++++++++++++++++++++++++++++++++++
sysdeps/s390/configure.in | 27 +++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
diff --git a/config.h.in b/config.h.in
index 68321d4..f7f2388 100644
--- a/config.h.in
+++ b/config.h.in
@@ -110,6 +110,9 @@
/* Define if assembler supports Intel MPX. */
#undef HAVE_MPX_SUPPORT
+/* Define if assembler supports vector instructions on S390. */
+#undef HAVE_S390_VX_ASM_SUPPORT
+
/* Define if gcc supports FMA4. */
#undef HAVE_FMA4_SUPPORT
diff --git a/sysdeps/s390/configure b/sysdeps/s390/configure
index 669bb9b..cc4c1e0 100644
--- a/sysdeps/s390/configure
+++ b/sysdeps/s390/configure
@@ -3,3 +3,42 @@
$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for S390 vector instruction support" >&5
+$as_echo_n "checking for S390 vector instruction support... " >&6; }
+if ${libc_cv_asm_s390_vx+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<\EOF
+void testvecinsn ()
+{
+ __asm__ (".machine \"z13\" \n\t"
+ ".machinemode \"zarch_nohighgprs\" \n\t"
+ "vistrbs %%v16,%%v17 \n\t"
+ "locghie %%r1,0" : :);
+}
+EOF
+if { ac_try='${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_asm_s390_vx=yes
+else
+ libc_cv_asm_s390_vx=no
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_s390_vx" >&5
+$as_echo "$libc_cv_asm_s390_vx" >&6; }
+
+if test "$libc_cv_asm_s390_vx" = yes ;
+then
+ $as_echo "#define HAVE_S390_VX_ASM_SUPPORT 1" >>confdefs.h
+
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Use binutils with vector-support in order to use optimized implementations." >&5
+$as_echo "$as_me: WARNING: Use binutils with vector-support in order to use optimized implementations." >&2;}
+fi
diff --git a/sysdeps/s390/configure.in b/sysdeps/s390/configure.in
index b5af4e1..733e356 100644
--- a/sysdeps/s390/configure.in
+++ b/sysdeps/s390/configure.in
@@ -4,3 +4,30 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
AC_DEFINE(PI_STATIC_AND_HIDDEN)
+
+AC_CACHE_CHECK(for S390 vector instruction support, libc_cv_asm_s390_vx, [dnl
+cat > conftest.c <<\EOF
+void testvecinsn ()
+{
+ __asm__ (".machine \"z13\" \n\t"
+ ".machinemode \"zarch_nohighgprs\" \n\t"
+ "vistrbs %%v16,%%v17 \n\t"
+ "locghie %%r1,0" : :);
+}
+EOF
+dnl
+dnl test, if assembler supports S390 vector instructions
+if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
+then
+ libc_cv_asm_s390_vx=yes
+else
+ libc_cv_asm_s390_vx=no
+fi
+rm -f conftest* ])
+
+if test "$libc_cv_asm_s390_vx" = yes ;
+then
+ AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT)
+else
+ AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
+fi
--
2.3.0