re PR target/48336 (Error in generation of ARM ldrd instruction)

2011-03-29  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/48336
	PR middle-end/48342
	PR rtl-optimization/48345
	* ira-color.c (setup_conflict_profitable_regs): Exclude prohibited
	hard regs for given mode from profitable regs when doing secondary
	allocation.

From-SVN: r171713

gcc/ChangeLog

+2011-03-29  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR target/48336
+	PR middle-end/48342
+	PR rtl-optimization/48345
+	* ira-color.c (setup_conflict_profitable_regs): Exclude prohibited
+	hard regs for given mode from profitable regs when doing secondary
+	allocation.
+
 2011-03-29  Jeff Law  <law@redhat.com>
 
 	PR bootstrap/48327

gcc/ira-color.c

@@ -1447,7 +1447,9 @@ update_conflict_hard_regno_costs (int *costs, enum reg_class aclass,
 }
 
 /* Set up conflicting and profitable regs (through CONFLICT_REGS and
-   PROFITABLE_REGS) for each object of allocno A.  */
+   PROFITABLE_REGS) for each object of allocno A.  Remember that the
+   profitable regs exclude hard regs which can not hold value of mode
+   of allocno A.  */
 static inline void
 setup_conflict_profitable_regs (ira_allocno_t a, bool retry_p,
 				HARD_REG_SET *conflict_regs,
@@ -1463,8 +1465,13 @@ setup_conflict_profitable_regs (ira_allocno_t a, bool retry_p,
       COPY_HARD_REG_SET (conflict_regs[i],
 			 OBJECT_TOTAL_CONFLICT_HARD_REGS (obj));
       if (retry_p)
-	COPY_HARD_REG_SET (profitable_regs[i],
-			   reg_class_contents[ALLOCNO_CLASS (a)]);
+	{
+	  COPY_HARD_REG_SET (profitable_regs[i],
+			     reg_class_contents[ALLOCNO_CLASS (a)]);
+	  AND_COMPL_HARD_REG_SET (profitable_regs[i],
+				  ira_prohibited_class_mode_regs
+				  [ALLOCNO_CLASS (a)][ALLOCNO_MODE (a)]);
+	}
       else
 	COPY_HARD_REG_SET (profitable_regs[i],
 			   OBJECT_COLOR_DATA (obj)->profitable_hard_regs);