- Add ctz patterns.

From-SVN: r62572

gcc/ChangeLog

@@ -2,8 +2,10 @@
 
 	* config/rs6000/rs6000.h (CLZ_DEFINED_VALUE_AT_ZERO): Define.
 	* config/rs6000/rs6000.md (clzsi2): Rename from cntlzw2.
+	(ctzsi2): New pattern.
 	(ffssi2): Use clz instead of unspec.
 	(clzdi2): Rename from cntlzd2.
+	(ctzdi2): New pattern.
 	(ffsdi2): Use clz instead of unspec.
 
 2003-02-07  Loren James Rittle  <ljrittle@acm.org>

gcc/config/rs6000/rs6000.h

@@ -2270,10 +2270,13 @@ do {									     \
    is done just by pretending it is already truncated.  */
 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
 
-/* The cntlzw and cntlzd instructions return 32 and 64 for zero.  */
+/* The cntlzw and cntlzd instructions return 32 and 64 for input of zero.  */
 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
   ((VALUE) = ((MODE) == SImode ? 32 : 64))
 
+/* The CTZ patterns return -1 for input of zero.  */
+#define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = -1)
+
 /* Specify the machine mode that pointers have.
    After generation of rtl, the compiler makes no further distinction
    between pointers and any other objects of this machine mode.  */

gcc/config/rs6000/rs6000.md

@@ -36,7 +36,6 @@
 ;; 16		macho_correct_pic
 ;; 19		movesi_from_cr
 ;; 20		movesi_to_cr
-;; 21		cntlz{w,d}2	count lead zero word/double word
 
 ;; Define an insn type attribute.  This is used in function unit delay
 ;; computations.