* config/tc-arm.c (rotate_left): Avoid undefined behaviour when N = 0.

gas/ChangeLog

@@ -1,3 +1,8 @@
+2014-11-20  Richard Earnshaw  <rearnsha@arm.com>
+
+	* config/tc-arm.c (rotate_left): Avoid undefined behaviour when
+	N = 0.
+
 2014-11-20  Richard Earnshaw  <rearnsha@arm.com>
 
 	* config/tc-aarch64.c (warn_unpredictable_ldst): Check that transfer

gas/config/tc-arm.c

@@ -7251,7 +7251,7 @@ parse_operands (char *str, const unsigned int *pattern, bfd_boolean thumb)
 
 /* Functions for operand encoding.  ARM, then Thumb.  */
 
-#define rotate_left(v, n) (v << n | v >> (32 - n))
+#define rotate_left(v, n) (v << (n & 31) | v >> ((32 - n) & 31))
 
 /* If VAL can be encoded in the immediate field of an ARM instruction,
    return the encoded form.  Otherwise, return FAIL.  */