From d04aacfc87503addc886a6a0ee9e69d73ffc280f Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Wed, 1 Aug 2012 09:36:01 +0000
Subject: lib2funcs.c (__clrsbhi2): New function.
* config/m32c/lib2funcs.c (__clrsbhi2): New function.
Implements __clrsb for an HImode argument.
From-SVN: r190032
---
libgcc/ChangeLog | 5 +++++
libgcc/config/m32c/lib2funcs.c | 16 +++++++++++++++-
2 files changed, 20 insertions(+), 1 deletion(-)
(limited to 'libgcc')
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 9d629e6..62f9446 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-01 Nick Clifton <nickc@redhat.com>
+
+ * config/m32c/lib2funcs.c (__clrsbhi2): New function.
+ Implements __clrsb for an HImode argument.
+
2012-07-31 Nick Clifton <nickc@redhat.com>
* config/stormy16/lib2funcs.c (__clrsbhi2): New function.
diff --git a/libgcc/config/m32c/lib2funcs.c b/libgcc/config/m32c/lib2funcs.c
index 274affc..76b237c 100644
--- a/libgcc/config/m32c/lib2funcs.c
+++ b/libgcc/config/m32c/lib2funcs.c
@@ -1,5 +1,5 @@
/* libgcc routines for R8C/M16C/M32C
- Copyright (C) 2005, 2009
+ Copyright (C) 2005, 2009, 2012
Free Software Foundation, Inc.
Contributed by Red Hat.
@@ -132,3 +132,17 @@ __umoddi3 (uint32_type a, uint32_type b)
{
return udivmodsi4 (a, b, 1);
}
+
+/* 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 (word_type x)
+{
+ if (x < 0)
+ x = ~x;
+ if (x == 0)
+ return 15;
+ return __builtin_clz (x) - 1;
+}
--
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