* gcse.c (hoist_code): Generate new pseudo for every new set insn.

From-SVN: r162591

gcc/ChangeLog

 2010-07-27  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
+	* gcse.c (hoist_code): Generate new pseudo for every new set insn.
+
+2010-07-27  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
 	PR rtl-optimization/40956
 	PR target/42495
 	PR middle-end/42574

gcc/gcse.c

@@ -4581,8 +4581,12 @@ hoist_code (void)
 
 		      /* Create a pseudo-reg to store the result of reaching
 			 expressions into.  Get the mode for the new pseudo
-			 from the mode of the original destination pseudo.  */
-		      if (expr->reaching_reg == NULL)
+			 from the mode of the original destination pseudo.
+
+			 It is important to use new pseudos whenever we
+			 emit a set.  This will allow reload to use
+			 rematerialization for such registers.  */
+		      if (!insn_inserted_p)
 			expr->reaching_reg
 			  = gen_reg_rtx_and_attrs (SET_DEST (set));