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