alpha.c (alpha_split_lock_test_and_set): Move memory barrier to below the test-and-set.

        * config/alpha/alpha.c (alpha_split_lock_test_and_set): Move
        memory barrier to below the test-and-set.
        (alpha_split_lock_test_and_set_12): Likewise.

From-SVN: r139950

gcc/ChangeLog

+2008-09-03  Richard Henderson  <rth@redhat.com>
+
+	* config/alpha/alpha.c (alpha_split_lock_test_and_set): Move
+	memory barrier to below the test-and-set.
+	(alpha_split_lock_test_and_set_12): Likewise.
+
 2008-09-03  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-opt/37243

gcc/config/alpha/alpha.c

@@ -4600,8 +4600,6 @@ alpha_split_lock_test_and_set (rtx retval, rtx mem, rtx val, rtx scratch)
   enum machine_mode mode = GET_MODE (mem);
   rtx label, x, cond = gen_lowpart (DImode, scratch);
 
-  emit_insn (gen_memory_barrier ());
-
   label = gen_rtx_LABEL_REF (DImode, gen_label_rtx ());
   emit_label (XEXP (label, 0));
 
@@ -4611,6 +4609,8 @@ alpha_split_lock_test_and_set (rtx retval, rtx mem, rtx val, rtx scratch)
 
   x = gen_rtx_EQ (DImode, cond, const0_rtx);
   emit_unlikely_jump (x, label);
+
+  emit_insn (gen_memory_barrier ());
 }
 
 void
@@ -4649,7 +4649,6 @@ alpha_split_lock_test_and_set_12 (enum machine_mode mode, rtx dest, rtx addr,
   mem = gen_rtx_MEM (DImode, align);
   MEM_VOLATILE_P (mem) = 1;
 
-  emit_insn (gen_memory_barrier ());
   label = gen_rtx_LABEL_REF (DImode, gen_label_rtx ());
   emit_label (XEXP (label, 0));
 
@@ -4673,6 +4672,8 @@ alpha_split_lock_test_and_set_12 (enum machine_mode mode, rtx dest, rtx addr,
 
   x = gen_rtx_EQ (DImode, scratch, const0_rtx);
   emit_unlikely_jump (x, label);
+
+  emit_insn (gen_memory_barrier ());
 }
 
 /* Adjust the cost of a scheduling dependency.  Return the new cost of