On Mon, Jul 08, 2024 at 05:27:53PM +0200, Richard Biener wrote: > > > > Am 08.07.2024 um 17:22 schrieb Andi Kleen <a...@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
