diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f2959dd7e87..66d8a9f6047 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-06-13  Bill Schmidt  <wschmidt@linux.ibm.com>
+
+	PR tree-optimization/53647
+	* tree-ssa-phiopt.c (gate_hoist_loads): Skip transformation for
+	targets with no defined cache line size.
+
 2012-06-13  Bill Schmidt  <wschmidt@linux.ibm.com>
 
 	* targhooks.c (default_builtin_vectorized_conversion): Handle
diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c
index 6e47f6f85b3..c64e8e2a984 100644
--- a/gcc/tree-ssa-phiopt.c
+++ b/gcc/tree-ssa-phiopt.c
@@ -1976,12 +1976,14 @@ hoist_adjacent_loads (basic_block bb0, basic_block bb1,
 /* Determine whether we should attempt to hoist adjacent loads out of
    diamond patterns in pass_phiopt.  Always hoist loads if
    -fhoist-adjacent-loads is specified and the target machine has
-   a conditional move instruction.  */
+   both a conditional move instruction and a defined cache line size.  */
 
 static bool
 gate_hoist_loads (void)
 {
-  return (flag_hoist_adjacent_loads == 1 && HAVE_conditional_move);
+  return (flag_hoist_adjacent_loads == 1
+	  && PARAM_VALUE (PARAM_L1_CACHE_LINE_SIZE)
+	  && HAVE_conditional_move);
 }
 
 /* Always do these optimizations if we have SSA