re PR middle-end/45098 (Missed induction variable optimization)

2011-05-18  Tom de Vries  <tom@codesourcery.com>

	PR target/45098
	* tree-ssa-loop-ivopts.c (computation_cost): Prevent cost of 0.

From-SVN: r173872

gcc/ChangeLog

+2011-05-18  Tom de Vries  <tom@codesourcery.com>
+
+	PR target/45098
+	* tree-ssa-loop-ivopts.c (computation_cost): Prevent cost of 0.
+
 2011-05-18  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*tls_global_dynamic_32_gnu): Split asm template.

gcc/tree-ssa-loop-ivopts.c

@@ -2866,6 +2866,8 @@ computation_cost (tree expr, bool speed)
   if (MEM_P (rslt))
     cost += address_cost (XEXP (rslt, 0), TYPE_MODE (type),
 			  TYPE_ADDR_SPACE (type), speed);
+  else if (!REG_P (rslt))
+    cost += rtx_cost (rslt, SET, speed);
 
   return cost;
 }