how to modify gcc to compile a[b] differently

[Gry Gunvor]

The documentation I find online for modifying gcc is rather old.  Is
there an up to date map of at least where in gcc the different stages
occur?

Suppose I just want to modify the instruction emitted for the "*"
operator.  Where is that?
Gry


On Wed, Apr 1, 2015 at 2:19 AM, Richard Biener
<richard.guenther@gmail.com> wrote:
> On Wed, Apr 1, 2015 at 12:20 AM, Gry Gunvor <gry.gunvor@gmail.com> wrote:
>> I want to modify gcc 4.9.2 so that array subscripting expressions a[b]
>> generate a new instruction/syscall foo(a, b) (that is, taking a and b
>> as arguments) rather than just being turned into *(a+b).
>>
>> Further, I want accesses into multi-dimensional arrays a[b][c] to turn
>> into foo(a, (b * row_size + c)) rather than *(a + b * row_size + c).
>>
>> Any help finding a simple and robust way to do this would be greatly
>> appreciated.
>
> You probably want to do this in the frontends.
>
> Richard.
>
>> Gry