re PR tree-optimization/53647 (gcc.c-torture/compile/20011229-1.c and…

re PR tree-optimization/53647 (gcc.c-torture/compile/20011229-1.c and gcc.c-torture/compile/pr25311.c)

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.

From-SVN: r188509

gcc/ChangeLog

 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
 	vec_construct, using vectype to base cost on subparts.
 	* target.h (enum vect_cost_for_stmt): Add vec_construct.

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