On Tue, Jan 11, 2022 at 8:49 PM Andrew MacLeod via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> The simplify_and_fold engine uses the EDGE_EXECUTABLE flag to eliminate
> branches:
>
> substitute_and_fold_dom_walker::before_dom_children:
>
> if (gimple_code (stmt) == GIMPLE_COND)
> {
> if ((EDGE_SUCC (bb, 0)->flags & EDGE_EXECUTABLE)
> ^ (EDGE_SUCC (bb, 1)->flags & EDGE_EXECUTABLE))
>
> ... but if certain passes before VRP2 are turned off, the flag can be in
> an uninitialized state upon entry to VRP2. This patch simply always
> sets EDGE_EXECUTABLE on all edges before invoking ranger and the S&F engine.
>
> Bootstraps on x86_64-pc-linux-gnu with no regressions.
>
> OK for trunk?
OK.
> Andrew
>
>
>
>
>
