rs6000: Delete HAVE_AS_LWSYNC and TARGET_LWSYNC_INSTRUCTION

All supported assemblers know lwsync, so we never need to generate this
instruction using the .long escape hatch.


	* config.in (HAVE_AS_LWSYNC): Delete.
	* config/powerpcspe/powerpcspe.h (TARGET_LWSYNC_INSTRUCTION): Delete.
	* config/powerpcspe/sync.md (*lwsync): Always generate lwsync, never
	do it as a .long .
	* config/rs6000/rs6000.h (TARGET_LWSYNC_INSTRUCTION): Delete.
	* config/rs6000/sync.md (*lwsync): Always generate lwsync, never do it
	as a .long .
	* configure.ac: Delete HAVE_AS_LWSYNC.
	* configure: Regenerate.

From-SVN: r264702

8 files changed, 14 insertions, 86 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 96baa7d..cf52864 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,15 @@
+2018-09-28  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config.in (HAVE_AS_LWSYNC): Delete.
+	* config/powerpcspe/powerpcspe.h (TARGET_LWSYNC_INSTRUCTION): Delete.
+	* config/powerpcspe/sync.md (*lwsync): Always generate lwsync, never
+	do it as a .long .
+	* config/rs6000/rs6000.h (TARGET_LWSYNC_INSTRUCTION): Delete.
+	* config/rs6000/sync.md (*lwsync): Always generate lwsync, never do it
+	as a .long .
+	* configure.ac: Delete HAVE_AS_LWSYNC.
+	* configure: Regenerate.
+
 2018-09-28  Eric Botcazou  <ebotcazou@adacore.com>
             Pierre-Marie de Rodat  <derodat@adacore.com>
 
diff --git a/gcc/config.in b/gcc/config.in
index 48dfd23..1242326 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -528,12 +528,6 @@
 #endif
 
 
-/* Define if your assembler supports LWSYNC instructions. */
-#ifndef USED_FOR_TARGET
-#undef HAVE_AS_LWSYNC
-#endif
-
-
 /* Define if your assembler supports the -mabi option. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_MABI_OPTION
diff --git a/gcc/config/powerpcspe/powerpcspe.h b/gcc/config/powerpcspe/powerpcspe.h
index a30fe34..2bb32c7 100644
--- a/gcc/config/powerpcspe/powerpcspe.h
+++ b/gcc/config/powerpcspe/powerpcspe.h
@@ -216,14 +216,6 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define TARGET_MFCRF 0
 #endif
 
-/* Define TARGET_LWSYNC_INSTRUCTION if the assembler knows about lwsync.  If
-   not, generate the lwsync code as an integer constant.  */
-#ifdef HAVE_AS_LWSYNC
-#define TARGET_LWSYNC_INSTRUCTION 1
-#else
-#define TARGET_LWSYNC_INSTRUCTION 0
-#endif
-
 /* Define TARGET_TLS_MARKERS if the target assembler does not support
    arg markers for __tls_get_addr calls.  */
 #ifndef HAVE_AS_TLS_MARKERS
diff --git a/gcc/config/powerpcspe/sync.md b/gcc/config/powerpcspe/sync.md
index f4f7bc2..dff3932 100644
--- a/gcc/config/powerpcspe/sync.md
+++ b/gcc/config/powerpcspe/sync.md
@@ -91,13 +91,10 @@
 	(unspec:BLK [(match_dup 0)] UNSPEC_LWSYNC))]
   ""
 {
-  /* Some AIX assemblers don't accept lwsync, so we use a .long.  */
   if (TARGET_NO_LWSYNC)
     return "sync";
-  else if (TARGET_LWSYNC_INSTRUCTION)
-    return "lwsync";
   else
-    return ".long 0x7c2004ac";
+    return "lwsync";
 }
   [(set_attr "type" "sync")])
 
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 232d442..d2fe795 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -219,14 +219,6 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define TARGET_MFCRF 0
 #endif
 
-/* Define TARGET_LWSYNC_INSTRUCTION if the assembler knows about lwsync.  If
-   not, generate the lwsync code as an integer constant.  */
-#ifdef HAVE_AS_LWSYNC
-#define TARGET_LWSYNC_INSTRUCTION 1
-#else
-#define TARGET_LWSYNC_INSTRUCTION 0
-#endif
-
 /* Define TARGET_TLS_MARKERS if the target assembler does not support
    arg markers for __tls_get_addr calls.  */
 #ifndef HAVE_AS_TLS_MARKERS
diff --git a/gcc/config/rs6000/sync.md b/gcc/config/rs6000/sync.md
index ee98049..f18b6b7 100644
--- a/gcc/config/rs6000/sync.md
+++ b/gcc/config/rs6000/sync.md
@@ -91,13 +91,10 @@
 	(unspec:BLK [(match_dup 0)] UNSPEC_LWSYNC))]
   ""
 {
-  /* Some AIX assemblers don't accept lwsync, so we use a .long.  */
   if (TARGET_NO_LWSYNC)
     return "sync";
-  else if (TARGET_LWSYNC_INSTRUCTION)
-    return "lwsync";
   else
-    return ".long 0x7c2004ac";
+    return "lwsync";
 }
   [(set_attr "type" "sync")])
 
diff --git a/gcc/configure b/gcc/configure
index f2d5a6f..5d2fd18 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -26723,49 +26723,6 @@ fi
 
 
     case $target in
-      *-*-aix*) conftest_s='	.csect .text[PR]
-	lwsync';;
-      *) conftest_s='	.text
-	lwsync';;
-    esac
-
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for lwsync support" >&5
-$as_echo_n "checking assembler for lwsync support... " >&6; }
-if test "${gcc_cv_as_powerpc_lwsync+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  gcc_cv_as_powerpc_lwsync=no
-    if test $in_tree_gas = yes; then
-    if test $gcc_cv_gas_vers -ge `expr \( \( 2 \* 1000 \) + 19 \) \* 1000 + 2`
-  then gcc_cv_as_powerpc_lwsync=yes
-fi
-  elif test x$gcc_cv_as != x; then
-    $as_echo "$conftest_s" > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a32 -o conftest.o conftest.s >&5'
-  { { eval echo "\"\$as_me\":${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
-	gcc_cv_as_powerpc_lwsync=yes
-    else
-      echo "configure: failed program was" >&5
-      cat conftest.s >&5
-    fi
-    rm -f conftest.o conftest.s
-  fi
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_powerpc_lwsync" >&5
-$as_echo "$gcc_cv_as_powerpc_lwsync" >&6; }
-if test $gcc_cv_as_powerpc_lwsync = yes; then
-
-$as_echo "#define HAVE_AS_LWSYNC 1" >>confdefs.h
-
-fi
-
-
-    case $target in
       *-*-aix*) conftest_s='	.machine "476"
 	.csect .text[PR]
 	dci 0';;
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 470fde6..3c1e0ad 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4558,19 +4558,6 @@ LCF0:
 	  [Define if your assembler supports VSX instructions.])])
 
     case $target in
-      *-*-aix*) conftest_s='	.csect .text[[PR]]
-	lwsync';;
-      *) conftest_s='	.text
-	lwsync';;
-    esac
-
-    gcc_GAS_CHECK_FEATURE([lwsync support],
-      gcc_cv_as_powerpc_lwsync, [2,19,2], -a32,
-      [$conftest_s],,
-      [AC_DEFINE(HAVE_AS_LWSYNC, 1,
-	  [Define if your assembler supports LWSYNC instructions.])])
-
-    case $target in
       *-*-aix*) conftest_s='	.machine "476"
 	.csect .text[[PR]]
 	dci 0';;