* combine.c (get_pos_from_mask): Test exact_log2 result as signed.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34280 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 8 insertions, 2 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6b70bbbc8a2..885b7398c88 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2000-05-30  Richard Henderson  <rth@cygnus.com>
 
+	* combine.c (get_pos_from_mask): Test exact_log2 result as signed.
+
+2000-05-30  Richard Henderson  <rth@cygnus.com>
+
 	* bb-reorder.c (emit_jump_to_block_after): Protect use of HAVE_return.
 
 2000-05-30  Bruce Korb  <bkorb@gnu.org>
diff --git a/gcc/combine.c b/gcc/combine.c
index 47642f3d42f..8d7cadccbb7 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6588,17 +6588,19 @@ get_pos_from_mask (m, plen)
 {
   /* Get the bit number of the first 1 bit from the right, -1 if none.  */
   int pos = exact_log2 (m & - m);
+  int len;
 
   if (pos < 0)
     return -1;
 
   /* Now shift off the low-order zero bits and see if we have a power of
      two minus 1.  */
-  *plen = exact_log2 ((m >> pos) + 1);
+  len = exact_log2 ((m >> pos) + 1);
 
-  if (*plen <= 0)
+  if (len <= 0)
     return -1;
 
+  *plen = len;
   return pos;
 }