Am Wed, Apr 12, 2023 at 05:16:55AM -0700 schrieb Carlo Arenas: > On Wed, Apr 12, 2023 at 5:07 AM Joerg Sonnenberger <jo...@bec.de> wrote: > > > > Am Wed, Apr 12, 2023 at 09:17:49AM -0000 schrieb Michael van Elst: > > > jo...@bec.de (Joerg Sonnenberger) writes: > > > > > > >Which compiler from this century doesn't allocate stack space > > > >independent from the source order? > > > > > > gcc with -O0 and -O1 allocates variables in source order. > > > > More by accident, not guaranteed. > > FWIW clang also does with -O0, not sure if it proves it is a common > mistake to make or there might be some intention to it.
It's not a mistake. Just that -O0 (and for gcc, -O1) effectively ask the compiler "just do whatever is easiest". Given how bad code generation in those modes is anyway, it's completely pointless to argue and optimize for this mode. Joerg
