double-int.h (double_int_popcount): New inline function.

2012-07-17  Tom de Vries  <tom@codesourcery.com>

	* double-int.h (double_int_popcount): New inline function.
	* hwint.c (popcount_hwi): New function.
	* hwint.h (popcount_hwi): Declare function.  New inline function.

From-SVN: r189575

4 files changed, 45 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3744447..f9f3f5f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-07-17  Tom de Vries  <tom@codesourcery.com>
+
+	* double-int.h (double_int_popcount): New inline function.
+	* hwint.c (popcount_hwi): New function.
+	* hwint.h (popcount_hwi): Declare function.  New inline function.
+
 2012-07-17  Richard Henderson  <rth@redhat.com>
 
 	* tree-vect-stmts.c (supportable_widening_operation): Remove decl
diff --git a/gcc/double-int.h b/gcc/double-int.h
index 50a9bda..eab9c3c 100644
--- a/gcc/double-int.h
+++ b/gcc/double-int.h
@@ -284,6 +284,14 @@ double_int_equal_p (double_int cst1, double_int cst2)
   return cst1.low == cst2.low && cst1.high == cst2.high;
 }
 
+/* Return number of set bits of CST.  */
+
+static inline int
+double_int_popcount (double_int cst)
+{
+  return popcount_hwi (cst.high) + popcount_hwi (cst.low);
+}
+
 
 /* Legacy interface with decomposed high/low parts.  */
 
diff --git a/gcc/hwint.c b/gcc/hwint.c
index bfc5e3d..024fb7e 100644
--- a/gcc/hwint.c
+++ b/gcc/hwint.c
@@ -107,6 +107,22 @@ ffs_hwi (unsigned HOST_WIDE_INT x)
   return 1 + floor_log2 (x & -x);
 }
 
+/* Return the number of set bits in X.  */
+
+int
+popcount_hwi (unsigned HOST_WIDE_INT x)
+{
+  int i, ret = 0;
+
+  for (i = 0; i < sizeof (x); i += 1)
+    {
+      ret += x & 1;
+      x >>= 1;
+    }
+
+  return ret;
+}
+
 #endif /* GCC_VERSION < 3004 */
 
 /* Compute the absolute value of X.  */
diff --git a/gcc/hwint.h b/gcc/hwint.h
index 00c9538..ca47148 100644
--- a/gcc/hwint.h
+++ b/gcc/hwint.h
@@ -179,6 +179,9 @@ extern int clz_hwi (unsigned HOST_WIDE_INT x);
 extern int ctz_hwi (unsigned HOST_WIDE_INT x);
 extern int ffs_hwi (unsigned HOST_WIDE_INT x);
 
+/* Return the number of set bits in X.  */
+extern int popcount_hwi (unsigned HOST_WIDE_INT x);
+
 /* Return log2, or -1 if not exact.  */
 extern int exact_log2                  (unsigned HOST_WIDE_INT);
 
@@ -232,6 +235,18 @@ ffs_hwi (unsigned HOST_WIDE_INT x)
 }
 
 static inline int
+popcount_hwi (unsigned HOST_WIDE_INT x)
+{
+# if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
+  return __builtin_popcountl (x);
+# elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
+  return __builtin_popcountll (x);
+# else
+  return __builtin_popcount (x);
+# endif
+}
+
+static inline int
 floor_log2 (unsigned HOST_WIDE_INT x)
 {
   return HOST_BITS_PER_WIDE_INT - 1 - clz_hwi (x);