* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@189997 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index bcfd22b..9d629e6 100644 (file)
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,10 @@
+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.

diff --git a/libgcc/config/stormy16/clrsbhi2.c b/libgcc/config/stormy16/clrsbhi2.c
new file mode 100644 (file)
index 0000000..3ce41ac
--- /dev/null
+++ b/libgcc/config/stormy16/clrsbhi2.c
@@ -0,0 +1,2 @@
+#define XSTORMY16_CLRSBHI2
+#include "lib2funcs.c"

diff --git a/libgcc/config/stormy16/lib2funcs.c b/libgcc/config/stormy16/lib2funcs.c
index a10a9b2..a996fd1 100644 (file)
--- a/libgcc/config/stormy16/lib2funcs.c
+++ b/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,

diff --git a/libgcc/config/stormy16/t-stormy16 b/libgcc/config/stormy16/t-stormy16
index d62d167..48ded89 100644 (file)
--- a/libgcc/config/stormy16/t-stormy16
+++ 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