On Tue, Feb 7, 2012 at 11:04 AM, Richard Guenther <richard.guent...@gmail.com> wrote:
>> (BTW: I think that the change to combine.c would be nice to have, to >> find more other combine opportunities. I will propose the patch >> separately.) > > Shouldn't there be a canonical order for parallels throughout the whole > compiler? Maybe just enforced by gen_rtx_PARALLEL / RTL checking? > At least as far as I understand "execution order" of insns inside a PARALLEL > is undefined. All operations inside parallel happen "at the same time". And there is no canonical order enforced, as sadly shown by the discrepancy between combine and compare elimination passes. Uros.