- Add ctz patterns.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@62572 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 92e0d2b..0c5d5ae 100644 (file)
--- a/gcc/ChangeLog
+++ b/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>

diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 31c88a0..1381ca4 100644 (file)
--- a/gcc/config/rs6000/rs6000.h
+++ b/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.  */

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index e4a17cf..142159d 100644 (file)
--- a/gcc/config/rs6000/rs6000.md
+++ b/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
 \f
 ;; Define an insn type attribute.  This is used in function unit delay
 ;; computations.