Hi,
On Wed, 3 May 2017, grischka wrote:
> However, suppose we have a field with bit_pos=5,bit_size=32.
> In order to read it we need to read 40 bits, yes? How do we
> do that on a 32-bit target, for example?
Yep, we don't (i.e. we're buggy in these cases and always were). It's one
example of the class of problems I'd added a comment on (tcctest.c ca.
line 2070):
#ifndef __i386__
/* on i386 we don't correctly support long long bit-fields.
The bitfields can straddle long long boundaries (at least with
GCC bitfield layout) and code generation isn't prepared for this
(would have to work with two words in that case). */
...
;-)
This also extends to long bit-fields straddling more than four bytes on
32bit (or eight bytes on 64 bit). Luckily those seems to happen
relatively seldom in practice.
> Test code attached, have fun ... (no hurry ;)
He, thanks. Yeah, eventually.
Ciao,
Michael.
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