lib2funcs.c (__clrsbhi2): New function.

	* config/stormy16/lib2funcs.c (__clrsbhi2): New function.
	Implements __clrsb for an HImode argument.
	* config/stormy16/clrsbhi2.c: New file:
	* config/stormy16/t-stormy16 (LIB2ADD): Add clrsbhi2.c.

From-SVN: r189997

libgcc/ChangeLog

+2012-07-31  Nick Clifton  <nickc@redhat.com>
+
+	* config/stormy16/lib2funcs.c (__clrsbhi2): New function.
+	Implements __clrsb for an HImode argument.
+	* config/stormy16/clrsbhi2.c: New file:
+	* config/stormy16/t-stormy16 (LIB2ADD): Add clrsbhi2.c.
+
 2012-07-22  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* libgcov.c (__gcov_ior_profiler): Benign comment fix.

libgcc/config/stormy16/clrsbhi2.c

+#define XSTORMY16_CLRSBHI2
+#include "lib2funcs.c"

libgcc/config/stormy16/lib2funcs.c

@@ -311,6 +311,22 @@ __ffshi2 (UHWtype u)
 }
 #endif
 
+#ifdef XSTORMY16_CLRSBHI2
+/* Returns the number of leading redundant sign bits in X.
+   I.e. the number of bits following the most significant bit which are
+   identical to it.  There are no special cases for 0 or other values.  */
+
+int
+__clrsbhi2 (HWtype x)
+{
+  if (x < 0)
+    x = ~x;
+  if (x == 0)
+    return 15;
+  return __builtin_clz (x) - 1;
+}
+#endif
+
 #ifdef XSTORMY16_UCMPSI2
 /* Performs an unsigned comparison of two 32-bit values: A and B.
    If A is less than B, then 0 is returned.  If A is greater than B,

libgcc/config/stormy16/t-stormy16

@@ -33,6 +33,7 @@ LIB2ADD = \
 	$(srcdir)/config/stormy16/clzhi2.c \
 	$(srcdir)/config/stormy16/ctzhi2.c \
 	$(srcdir)/config/stormy16/ffshi2.c \
+	$(srcdir)/config/stormy16/clrsbhi2.c \
 	$(srcdir)/config/stormy16/cmpsi2.c \
 	$(srcdir)/config/stormy16/ucmpsi2.c