On Wed, Mar 20, 2013 at 12:20:27PM +0100, Richard Biener wrote:
> Walking the SSA def chain would also be possible - preferably from
> cfgexpand.c when we process the stmt. But you'll eventually lose
> debug info like for
>
> int i = 1;
> __builtin_foo (i);
>
> when we then never expand the SSA name def i_2 = 1 because we are
> never visiting its use ...
If i is a user variable, then for -O0 we'd better create a memory slot for
it and expand the i = 1 store as store to that memory location.
Jakub
