ira.c (ira_non_ordered_class_hard_regs): Define.

       * ira.c (ira_non_ordered_class_hard_regs): Define.
        (setup_class_hard_regs): Initialize ira_non_ordered_class_hard_regs.
        * ira-int.h (ira_non_ordered_class_hard_regs): Declare.
        * ira-costs.c (ira_tune_allocno_costs_and_cover_classes): Increase
        cost of unaligned hard regs when allocating multi-reg pseudos.

From-SVN: r159644

gcc/ChangeLog

+2009-09-14  Vladimir Makarov <vmakarov@redhat.com>
+
+	* ira.c (ira_non_ordered_class_hard_regs): Define.
+        (setup_class_hard_regs): Initialize ira_non_ordered_class_hard_regs.
+	* ira-int.h (ira_non_ordered_class_hard_regs): Declare.
+	* ira-costs.c (ira_tune_allocno_costs_and_cover_classes): Increase
+	cost of unaligned hard regs when allocating multi-reg pseudos.
+
 2010-05-20  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* config.gcc (mips*-sde-elf*): Don't use sdemtk.opt.

gcc/ira-costs.c

@@ -1773,5 +1773,32 @@ ira_tune_allocno_costs_and_cover_classes (void)
 	}
       if (min_cost != INT_MAX)
 	ALLOCNO_COVER_CLASS_COST (a) = min_cost;
+
+      /* Some targets allow pseudos to be allocated to unaligned
+         sequences of hard registers.  However, selecting an unaligned
+         sequence can unnecessarily restrict later allocations.  So
+         increase the cost of unaligned hard regs to encourage the use
+         of aligned hard regs.  */
+      {
+	int nregs, index;
+
+	if ((nregs = ira_reg_class_nregs[cover_class][ALLOCNO_MODE (a)]) > 1)
+	  {
+	    ira_allocate_and_set_costs
+	      (&ALLOCNO_HARD_REG_COSTS (a), cover_class,
+	       ALLOCNO_COVER_CLASS_COST (a));
+	    reg_costs = ALLOCNO_HARD_REG_COSTS (a);
+	    for (j = n - 1; j >= 0; j--)
+	      {
+		if (j % nregs != 0)
+		  {
+		    regno = ira_non_ordered_class_hard_regs[cover_class][j];
+		    index = ira_class_hard_reg_index[cover_class][regno];
+		    ira_assert (index != 0);
+		    reg_costs[index] += ALLOCNO_FREQ (a);
+		  }
+	      }
+	  }
+      }
     }
 }

gcc/ira-int.h

@@ -743,6 +743,11 @@ extern move_table *ira_may_move_out_cost[MAX_MACHINE_MODE];
    allocation.  */
 extern int ira_class_subset_p[N_REG_CLASSES][N_REG_CLASSES];
 
+/* Array of the number of hard registers of given class which are
+   available for allocation.  The order is defined by the the hard
+   register numbers.  */
+extern short ira_non_ordered_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
+
 /* Index (in ira_class_hard_regs) for given register class and hard
    register (in general case a hard register can belong to several
    register classes).  The index is negative for hard registers

gcc/ira.c

@@ -413,6 +413,11 @@ static HARD_REG_SET no_unit_alloc_regs;
    allocation order.  */
 short ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
 
+/* Array of the number of hard registers of given class which are
+   available for allocation.  The order is defined by the
+   the hard register numbers.  */
+short ira_non_ordered_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
+
 /* The number of elements of the above array for given register
    class.  */
 int ira_class_hard_regs_num[N_REG_CLASSES];
@@ -437,7 +442,10 @@ setup_class_hard_regs (void)
       AND_COMPL_HARD_REG_SET (temp_hard_regset, no_unit_alloc_regs);
       CLEAR_HARD_REG_SET (processed_hard_reg_set);
       for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+	{
+	  ira_non_ordered_class_hard_regs[cl][0] = -1;
 	  ira_class_hard_reg_index[cl][0] = -1;
+	}
       for (n = 0, i = 0; i < FIRST_PSEUDO_REGISTER; i++)
 	{
 #ifdef REG_ALLOC_ORDER
@@ -457,6 +465,10 @@ setup_class_hard_regs (void)
 	    }
 	}
       ira_class_hard_regs_num[cl] = n;
+      for (n = 0, i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+	if (TEST_HARD_REG_BIT (temp_hard_regset, i))
+	  ira_non_ordered_class_hard_regs[cl][n++] = i;
+      ira_assert (ira_class_hard_regs_num[cl] == n);
     }
 }