* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@139950 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 87e5fcc..60a17b2 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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

diff --git a/gcc/config/alpha/alpha.c b/gcc/config/alpha/alpha.c
index a4d3bf1..3d546be 100644 (file)
--- a/gcc/config/alpha/alpha.c
+++ b/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 ());
 }
 \f
 /* Adjust the cost of a scheduling dependency.  Return the new cost of