Re: [Tinycc-devel] Tinycc-devel Digest, Vol 134, Issue 16

[jiang]

This is my patch (see Annex)

tcc result is correct
--> 254 / 30 / 126

1 1 1 1 1 1 1 0 -> 254
254 & 0x7f (c:7)

1 1 1 1 1 1 1 0 -> 254
0 1 1 1 1 1 1 1 -> 0x7f
---------------------&-----
0 1 1 1 1 1 1 0 -> 126

(b:5)
0 1 1 1 1 1 1 0 -> 126
0 0 0 1 1 1 1 1 -> 0x1f
---------------------&-----
0 0 0 1 1 1 1 0 -> 30


(a:9)
0 0 0 0 1 1 1 1 0 -> 30
1 1 1 1 1 1 1 1 1 -> 0x1ff
---------------------&-----
0 0 0 1 1 1 1 0 -> 30

I guess gcc & mvc repeated use of the register, so wrong

于 2014年06月21日 22:25, address@hidden 写道:
> jiang wrote:
> > /* bitfield store handling */
> > + SValue tmp;
> > + tmp = vtop[0];
> > [...]
> > + vtop--;
> > + vpushv(&tmp);
>
>
> This is still not a solution. See
>
> #include <stdio.h>
> int main(int argc, char **argv)
> {
> struct {
> unsigned a:9, b:5, c:7;
> } _s, *s = &_s;
> int n = 250;
>
> s->a = s->b = s->c = n + 4;
> printf("--> %d / %d / %d\n", s->a, s->b, s->c);
> return 0;
> }
> --> 432 / 16 / 126
>
> gcc & msvc:
> --> 30 / 30 / 126
> tcc release_0_9_26
> --> 254 / 30 / 126
>
> FWIW, the line above is the reason why I'm trying to investigate
> this. Let's see if Mr. jiang can come up with something useful
> (and how long it will take).
>
> -- gr

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