[PATCH v8 07/12] Enable musttail tail conversion even when not optimizing

[Andi Kleen]

On Mon, Jul 08, 2024 at 05:27:53PM +0200, Richard Biener wrote:
> 
> 
> > Am 08.07.2024 um 17:22 schrieb Andi Kleen <ak@linux.intel.com>:
> > 
> > On Mon, Jul 08, 2024 at 08:53:27AM +0200, Richard Biener wrote:
> >> Ah, I see.  So this pass is responsible for both -O0 and
> >> -fno-optimized-sibling-calls.
> >> But I'm quite sure the other pass doesn't run with -O0
> >> -foptimize-sibling-calls, does it?
> > 
> > It does run:
> > 
> > ./cc1 -O0 -fdump-passes -foptimize-sibling-calls t.c 2>&1 | grep tail
> >         tree-tailr1                                   :  ON
> >      tree-tailr2                                      :  ON
> >      tree-tailc                                       :  ON
> 
> I would not trust -fdump-passes, IIRC that just executes the gate functions.

You're right it's not invoked according to gdb.

So the musttail gate needs a || optimize == 0.

-Andi