Avoid undefined behaviour in rorate_left() macro. From NetBSD via FreeBSD.

Makes gas work when compiled with clang.

ok patrick@, millert@

diff --git a/gnu/usr.bin/binutils-2.17/gas/config/tc-arm.c b/gnu/usr.bin/binutils-2.17/gas/config/tc-arm.c
index da965a0..e00afa2 100644 (file)
--- a/gnu/usr.bin/binutils-2.17/gas/config/tc-arm.c
+++ b/gnu/usr.bin/binutils-2.17/gas/config/tc-arm.c
@@ -4266,7 +4266,7 @@ parse_operands (char *str, const unsigned char *pattern)
 
 /* Functions for operand encoding.  ARM, then Thumb.  */
 
-#define rotate_left(v, n) (v << n | v >> (32 - n))
+#define rotate_left(v, n) (v << (n % 32) | v >> ((32 - n) % 32))
 
 /* If VAL can be encoded in the immediate field of an ARM instruction,
    return the encoded form.  Otherwise, return FAIL.  */