[Bug other/55441] New: ThreadSanitizer: handle bitfields

["dvyukov at google dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55441

             Bug #: 55441
           Summary: ThreadSanitizer: handle bitfields
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dvyukov@google.com


Currently gcc/tsan.c handles only bitfield accesses that are byte-aligned and
has byte-granularity:

+  if (bitpos % (size * BITS_PER_UNIT)
+      || bitsize != size * BITS_PER_UNIT)
+    return false;

It must be fixed to handle all bitfield access by extending access to the whole
bitfiled. I.e. an access to an uint64 bitfield touches the whole uint64.