Re: [C++0x] contiguous bitfields race implementation

[Jason Merrill]

It seems like you're calculating maxbits correctly now, but an access 
doesn't necessarily start from the beginning of the sequence of 
bit-fields, especially given store_split_bit_field.  That is,

struct A
{
  int i;
  int j: 32;
  int k: 8;
  char c[2];
};
Here maxbits would be 40, so we decide that it's OK to use SImode to 
access the word starting with k, and clobber c in the process.  Am I wrong?

Jason