re PR target/42869 (GOMP_critical_start wrong on Itanium due to __sync miscompilation)

2010-03-12  Steve Ellcey  <sje@cup.hp.com>

	PR target/42869
	* config/ia64/sync.md (sync_compare_and_swap): Move memory fence.

From-SVN: r157410

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9bb215a..580ccc4 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-12  Steve Ellcey  <sje@cup.hp.com>
+
+       PR target/42869
+       * config/ia64/sync.md (sync_compare_and_swap): Move memory fence.
+
 2010-03-12  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
        PR middle-end/42431

diff --git a/gcc/config/ia64/sync.md b/gcc/config/ia64/sync.md
index b40e208..9aec0fe 100644 (file)
--- a/gcc/config/ia64/sync.md
+++ b/gcc/config/ia64/sync.md
@@ -135,8 +135,8 @@
   if (GET_MODE (dst) != DImode)
     dst = gen_reg_rtx (DImode);
 
-  emit_insn (gen_memory_barrier ());
   emit_insn (gen_cmpxchg_rel_<mode> (dst, operands[1], ccv, operands[3]));
+  emit_insn (gen_memory_barrier ());
 
   if (dst != operands[0])
     emit_move_insn (operands[0], gen_lowpart (<MODE>mode, dst));