Re: RFC: Simplify rules for ctz/clz patterns and RTL

[David Edelsohn]

        I think the cost would be something like:

Index: rs6000.c
===================================================================
--- rs6000.c    (revision 127484)
+++ rs6000.c    (working copy)
@@ -20292,10 +20292,15 @@
        *total += COSTS_N_INSNS (2);
       return false;
 
+    case CTZ:
     case FFS:
       *total = COSTS_N_INSNS (4);
       return false;
 
+    case POPCOUNT:
+      *total = COSTS_N_INSNS (3);
+      return false;
+
     case NOT:
       if (outer_code == AND || outer_code == IOR || outer_code == XOR)
        {
@@ -20305,6 +20310,7 @@
       /* FALLTHRU */
 
     case AND:
+    case CLZ:
     case IOR:
     case XOR:
     case ZERO_EXTRACT: