bitmap.h (+bmp_iter_next_bit): New.

	* bitmap.h (+bmp_iter_next_bit): New.
	(bmp_iter_set, bmp_iter_and, bmp_iter_and_compl):
	Use it.

From-SVN: r160637

gcc/ChangeLog

+2010-06-11  Jan Hubicka  <jh@suse.cz>
+
+	* bitmap.h (+bmp_iter_next_bit): New.
+	(bmp_iter_set, bmp_iter_and, bmp_iter_and_compl):
+	Use it.
+
 2010-06-11  Sandra Loosemore  <sandra@codesourcery.com>
             Eric Botcazou  <ebotcazou@adacore.com>
 

gcc/bitmap.h

@@ -385,6 +385,27 @@ bmp_iter_next (bitmap_iterator *bi, unsigned *bit_no)
   *bit_no += 1;
 }
 
+/* Advance to first set bit in BI.  */
+
+static inline void
+bmp_iter_next_bit (bitmap_iterator * bi, unsigned *bit_no)
+{
+#if (GCC_VERSION >= 3004)
+  {
+    unsigned int n = __builtin_ctzl (bi->bits);
+    gcc_assert (sizeof (unsigned long) == sizeof (BITMAP_WORD));
+    bi->bits >>= n;
+    *bit_no += n;
+  }
+#else
+  while (!(bi->bits & 1))
+    {
+      bi->bits >>= 1;
+      *bit_no += 1;
+    }
+#endif
+}
+
 /* Advance to the next nonzero bit of a single bitmap, we will have
    already advanced past the just iterated bit.  Return true if there
    is a bit to iterate.  */
@@ -396,11 +417,7 @@ bmp_iter_set (bitmap_iterator *bi, unsigned *bit_no)
   if (bi->bits)
     {
     next_bit:
-      while (!(bi->bits & 1))
-	{
-	  bi->bits >>= 1;
-	  *bit_no += 1;
-	}
+      bmp_iter_next_bit (bi, bit_no);
       return true;
     }
 
@@ -443,11 +460,7 @@ bmp_iter_and (bitmap_iterator *bi, unsigned *bit_no)
   if (bi->bits)
     {
     next_bit:
-      while (!(bi->bits & 1))
-	{
-	  bi->bits >>= 1;
-	  *bit_no += 1;
-	}
+      bmp_iter_next_bit (bi, bit_no);
       return true;
     }
 
@@ -510,11 +523,7 @@ bmp_iter_and_compl (bitmap_iterator *bi, unsigned *bit_no)
   if (bi->bits)
     {
     next_bit:
-      while (!(bi->bits & 1))
-	{
-	  bi->bits >>= 1;
-	  *bit_no += 1;
-	}
+      bmp_iter_next_bit (bi, bit_no);
       return true;
     }