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

	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:
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