* config/elfos.h, config/spu/spu.c, tree-ssa-operands.h,

[pf3gnuchains/gcc-fork.git] / gcc / regclass.c

diff --git a/gcc/regclass.c b/gcc/regclass.c
index 7b2d5b1..8a0bab1 100644 (file)
--- a/gcc/regclass.c
+++ b/gcc/regclass.c
@@ -811,7 +811,8 @@ struct costs
 /* Structure used to record preferences of given pseudo.  */
 struct reg_pref
 {
-  /* (enum reg_class) prefclass is the preferred class.  */
+  /* (enum reg_class) prefclass is the preferred class.  May be
+     NO_REGS if no class is better than memory.  */
   char prefclass;
 
   /* altclass is a register class that we should use for allocating
@@ -1314,6 +1315,10 @@ regclass (rtx f, int nregs)
                best = reg_class_subunion[(int) best][class];
            }
 
+         /* If no register class is better than memory, use memory. */
+         if (p->mem_cost < best_cost)
+           best = NO_REGS;
+
          /* Record the alternate register class; i.e., a class for which
             every register in it is better than using memory.  If adding a
             class would make a smaller class (i.e., no union of just those
@@ -1524,7 +1529,7 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops,
                     to what we would add if this register were not in the
                     appropriate class.  */
 
-                 if (reg_pref)
+                 if (reg_pref && reg_pref[REGNO (op)].prefclass != NO_REGS)
                    alt_cost
                      += (may_move_in_cost[mode]
                          [(unsigned char) reg_pref[REGNO (op)].prefclass]
@@ -1750,7 +1755,7 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops,
                     to what we would add if this register were not in the
                     appropriate class.  */
 
-                 if (reg_pref)
+                 if (reg_pref && reg_pref[REGNO (op)].prefclass != NO_REGS)
                    alt_cost
                      += (may_move_in_cost[mode]
                          [(unsigned char) reg_pref[REGNO (op)].prefclass]
@@ -1836,7 +1841,8 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops,
          int class;
          unsigned int nr;
 
-         if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0)
+         if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0
+             && reg_pref[regno].prefclass != NO_REGS)
            {
              enum reg_class pref = reg_pref[regno].prefclass;