[nasm:master] nasmlib: Plcate undefined behaviour in signed_bits

[nasm-bot f. C. G. <gor...@gm...>]

Commit-ID:  6377180e0873731f60a18fe5a61065f9c7795603
Gitweb:     http://repo.or.cz/w/nasm.git?a=commitdiff;h=6377180e0873731f60a18fe5a61065f9c7795603
Author:     Cyrill Gorcunov <gor...@gm...>
AuthorDate: Sun, 11 Oct 2015 17:57:04 +0300
Committer:  Cyrill Gorcunov <gor...@gm...>
CommitDate: Sun, 11 Oct 2015 18:06:30 +0300

nasmlib: Plcate undefined behaviour in signed_bits

http://bugzilla.nasm.us/show_bug.cgi?id=3392320

Reported-by: Dingbao Xie <xie...@gm...>
Signed-off-by: Cyrill Gorcunov <gor...@gm...>


---
 nasmlib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nasmlib.h b/nasmlib.h
index fb2bb08..a3a8c12 100644
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -456,7 +456,7 @@ static inline int64_t signed_bits(int64_t value, int bits)
     if (bits < 64) {
         value &= ((int64_t)1 << bits) - 1;
         if (value & (int64_t)1 << (bits - 1))
-            value |= (int64_t)-1 << bits;
+            value |= (int64_t)((uint64_t)-1 << bits);
     }
     return value;
 }