2013-07-17 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>

	* config/s390/s390.c: (s390_expand_builtin): Allow -mhtm to be
	enabled without -march=zEC12.
	* config/s390/s390.h (TARGET_HTM): Do not require EC12 machine
	flags to be set.

2013-07-17  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* acinclude.m4: Add htm asm check for s390.
	* configure.tgt: Add -mhtm and -Wa,-march=zEC12 to the options.
	* configure: Regenerate.
	* config/s390/target.h: Remove __HTM__ check.
	(htm_available): Call getauxval to get hwcaps and check whether
	HTM is available or not.





git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@201004 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 73 insertions, 8 deletions

diff --git a/libitm/ChangeLog b/libitm/ChangeLog
index 6b8ac0be157..3e9a7067979 100644
--- a/libitm/ChangeLog
+++ b/libitm/ChangeLog
@@ -1,3 +1,12 @@
+2013-07-17  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	* acinclude.m4: Add htm asm check for s390.
+	* configure.tgt: Add -mhtm and -Wa,-march=zEC12 to the options.
+	* configure: Regenerate.
+	* config/s390/target.h: Remove __HTM__ check.
+	(htm_available): Call getauxval to get hwcaps and check whether
+	HTM is available or not.
+
 2013-07-15  Peter Bergner  <bergner@vnet.ibm.com>
 
 	* acinclude.m4 (LIBITM_CHECK_AS_HTM): New.
diff --git a/libitm/acinclude.m4 b/libitm/acinclude.m4
index eacf8d45383..ca7e0a92118 100644
--- a/libitm/acinclude.m4
+++ b/libitm/acinclude.m4
@@ -135,6 +135,17 @@ powerpc*)
     AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
   fi
   ;;
+s390*)
+  AC_CACHE_CHECK([if the assembler supports HTM], libitm_cv_as_htm, [
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -march=zEC12"
+    AC_TRY_COMPILE([], [asm("tbegin 0,0; tend");],
+		   [libitm_cv_as_htm=yes], [libitm_cv_as_htm=no])
+    CFLAGS="$save_CFLAGS"])
+  if test x$libitm_cv_as_htm = xyes; then
+    AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
+  fi
+  ;;
 esac])
 
 sinclude(../libtool.m4)
diff --git a/libitm/config/s390/target.h b/libitm/config/s390/target.h
index 580606f0270..17228f844dd 100644
--- a/libitm/config/s390/target.h
+++ b/libitm/config/s390/target.h
@@ -22,11 +22,9 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
-
-#include <htmintrin.h>
-
-/* Number of retries for transient failures.  */
-#define _HTM_ITM_RETRIES 10
+#ifdef HAVE_SYS_AUXV_H
+#include <sys/auxv.h>
+#endif
 
 namespace GTM HIDDEN {
 
@@ -58,13 +56,24 @@ cpu_relax (void)
   __asm volatile ("" : : : "memory");
 }
 
-#ifdef __HTM__
+
+// Use HTM if it is supported by the system.
+// See gtm_thread::begin_transaction for how these functions are used.
+#if defined (__linux__) \
+    && defined (HAVE_AS_HTM) \
+    && defined (HAVE_GETAUXVAL) \
+    && defined (HWCAP_S390_TE)
+
+#include <htmintrin.h>
+
+/* Number of retries for transient failures.  */
+#define _HTM_ITM_RETRIES 10
 #define USE_HTM_FASTPATH
 
 static inline bool
 htm_available ()
 {
-  return true;
+  return (getauxval (AT_HWCAP) & HWCAP_S390_TE) ? true : false;
 }
 
 static inline uint32_t
diff --git a/libitm/configure b/libitm/configure
index 7b3c0692e8f..21361b031ad 100644
--- a/libitm/configure
+++ b/libitm/configure
@@ -17399,6 +17399,42 @@ $as_echo "#define HAVE_AS_HTM 1" >>confdefs.h
 
   fi
   ;;
+s390*)
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking if the assembler supports HTM" >&5
+$as_echo_n "checking if the assembler supports HTM... " >&6; }
+if test "${libitm_cv_as_htm+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -march=zEC12"
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+asm("tbegin 0,0; tend");
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libitm_cv_as_htm=yes
+else
+  libitm_cv_as_htm=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    CFLAGS="$save_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libitm_cv_as_htm" >&5
+$as_echo "$libitm_cv_as_htm" >&6; }
+  if test x$libitm_cv_as_htm = xyes; then
+
+$as_echo "#define HAVE_AS_HTM 1" >>confdefs.h
+
+  fi
+  ;;
 esac
 
 
diff --git a/libitm/configure.tgt b/libitm/configure.tgt
index d8f3ca52876..4dc2807cfe5 100644
--- a/libitm/configure.tgt
+++ b/libitm/configure.tgt
@@ -109,8 +109,8 @@ case "${target_cpu}" in
 	ARCH=x86
 	;;
   s390|s390x)
+	XCFLAGS="${XCFLAGS} -mzarch -mhtm -Wa,-march=zEC12"
 	ARCH=s390
-	XCFLAGS="${XCFLAGS} -mzarch"
 	;;
 
   *)