Re: [Tinycc-devel] tcc grammar problems

[jiang]

I would like you to explain my patch.
I vstore () in bitfield values ​​on the right match, with gen_cast (dt) 
to achieve.
For example;
struct st {int a: 16; int b: 16} s;
s.a = 55;
Calculation process, with sa (left) Type 55 (right value) match, to call 
gen_cast (dt)
Complete the following calculations.
55 & 0xff
Next bit_pos and bit_size matching operation, complete vstore () in.

In vstore () in ret, cc, gen_ctrl, is played to optimize the size of the 
effect.
For example:
s.a = 55; // ret = 0, gv_dup () does not call
sb = sa = 55 // calculated to s.a time, ret = 1, gv_dup () call.
//Calculate when to s.b, ret = 0, gv_dup () does not call

There are the following cases:
int ii = sb = sa = 55; // need to use gen_ctrl, because ii 
initialization, there is a return value, see init_putv ()
Another is:
gen_cast () has been added
tcc_warning ("overflow in implicit constant conversion");
tcc_warning("large integer implicitly truncated to unsigned type");

The meaning is very simple patch

Jiang