ira.c (update_equiv_regs): Prohibit move insns if pressure-sensitive scheduling was done.

2010-12-06  Vladimir Makarov  <vmakarov@redhat.com>

	* ira.c (update_equiv_regs): Prohibit move insns if
	pressure-sensitive scheduling was done.

From-SVN: r167519

gcc/ChangeLog

+2010-12-06  Vladimir Makarov  <vmakarov@redhat.com>
+
+	* ira.c (update_equiv_regs): Prohibit move insns if
+	pressure-sensitive scheduling was done.
+
 2010-12-06  Nicola Pero  <nicola.pero@meta-innovation.com>
 
 	* c-parser.c (c_parser_for_statement): Use c_fully_fold() instead

gcc/ira.c

@@ -2585,7 +2585,13 @@ update_equiv_regs (void)
 		  rtx equiv_insn;
 
 		  if (! reg_equiv[regno].replace
-		      || reg_equiv[regno].loop_depth < loop_depth)
+		      || reg_equiv[regno].loop_depth < loop_depth
+		      /* There is no sense to move insns if we did
+			 register pressure-sensitive scheduling was
+			 done because it will not improve allocation
+			 but worsen insn schedule with a big
+			 probability.  */
+		      || (flag_sched_pressure && flag_schedule_insns))
 		    continue;
 
 		  /* reg_equiv[REGNO].replace gets set only when