Re: Scheduling and inserting NOPs

[Boris Boesler <baembel at gmx dot de>]

Am 21.11.2007 um 18:39 schrieb Andrew Haley:

> > Walk the instructions in each BB, and if you see a violation stuff  
> > a NOP.
> >
> > This is so simple that I'm wondering if there's something important
> > that I'm failing to understand.
>
> Ah, hold on.  Is it that you don't know where sched inserted the empty
> cycles, and there's no easy way to find out?

 Finally. YES.

 To solve this someone simply stored cycle and insn (recorded in  
TARGET_SCHED_REORDER) in a hash-table and reused this info in  
TARGET_MACHINE_DEPENDENT_REORG. But I read that there passes which  
might reorder or insert additional code. In that case the info in the  
hash-table might be incorrect or not valid.

 Any ideas?

Boris