Re: Puzzle about CFG on rtl during delay slot schedule

> Cheng, can you explain what lead you to this "discovery", and what > you're trying to achieve? Thanks for all your enthusiastic explanation. Well, we are now trying to find our processor's critical timing path by running it at higher frequency than it was designed for. One timing prob we found i

Re: Puzzle about CFG on rtl during delay slot schedule

On Fri, Apr 2, 2010 at 4:26 PM, Jeff Law wrote: > On 04/02/10 05:26, Steven Bosscher wrote: >> >> Yes. The CFG is constructed on GIMPLE and then maintained all the way >> through to reorg.c (or actually pass_free_cfg). Once destroyed, we >> cannot resurrect the CFG. >> >> In a perfect world, reorg

Re: Puzzle about CFG on rtl during delay slot schedule

On 04/02/10 05:26, Steven Bosscher wrote: Yes. The CFG is constructed on GIMPLE and then maintained all the way through to reorg.c (or actually pass_free_cfg). Once destroyed, we cannot resurrect the CFG. In a perfect world, reorg.c would get a rewrite and we'd maintain the CFG all the way thro

Re: Puzzle about CFG on rtl during delay slot schedule

On Fri, Apr 2, 2010 at 12:41 PM, Amker.Cheng wrote: >> The CFG is not maintained during delay slot scheduling. This is, in >> fact, a very old and well-known problem. Look for any e-mail on this >> list that mentions reorg.c :-) >> > Thanks, further more , It seems cfg are not maintained after del

Fwd: Puzzle about CFG on rtl during delay slot schedule

> The CFG is not maintained during delay slot scheduling. This is, in > fact, a very old and well-known problem. Look for any e-mail on this > list that mentions reorg.c :-) > Thanks, further more , It seems cfg are not maintained after delay slot scheduling. also find that problem just before fina

Re: Puzzle about CFG on rtl during delay slot schedule

On Fri, Apr 2, 2010 at 11:28 AM, Amker.Cheng wrote: > Hi : >   I'm wondering whether cfg is maintained properly during delay slot > scheduling, The CFG is not maintained during delay slot scheduling. This is, in fact, a very old and well-known problem. Look for any e-mail on this list that mentio

Puzzle about CFG on rtl during delay slot schedule

Hi : I'm wondering whether cfg is maintained properly during delay slot scheduling, Because when compiling libgcc/_divsc3.o, rtl dump in libgcc2.c.198r.mach has following lines: no bb for insn with uid = 293. deleting insn with uid = 690. deleting insn with uid = 904. .. (note 298 905 303