The answer is ARM can. However, if you look into the bugs PR30282 and PR38644, PR44199, you may find in history, there are several different cases
in different ports reporting the similar failures, covering x86, PowerPC and ARM. You are right, they were all fixed in back-ends in the past, but we should fix the bug in a general way to make GCC infrastructure stronger, rather than fixing the problem target-by-target and case-by-case! If you further look into the back-end fixes in x86 and PowerPC, you may find they looks quite similar in back-ends. Thanks, -Jiangning > -----Original Message----- > From: gcc-patches-ow...@gcc.gnu.org [mailto:gcc-patches-ow...@gcc.gnu.org] > On Behalf Of Jakub Jelinek > Sent: Monday, August 01, 2011 5:12 PM > To: Jiangning Liu > Cc: 'Joern Rennecke'; gcc@gcc.gnu.org; gcc-patc...@gcc.gnu.org; > vmaka...@redhat.com; dje....@gmail.com; Richard Henderson; Ramana > Radhakrishnan; 'Ramana Radhakrishnan' > Subject: Re: [RFC] Add middle end hook for stack red zone size > > On Mon, Aug 01, 2011 at 11:44:04AM +0800, Jiangning Liu wrote: > > It's quite necessary to solve the general problem in middle-end rather than in > back-end. > > That's what we disagree on. All back-ends but ARM are able to handle it > right, why can't ARM too? The ABI rules for stack handling in the epilogues > are simply too diverse and complex to be handled easily in the scheduler. > > Jakub
