On Sun, 2005-11-13 at 22:20 +0100, Steven Bosscher wrote: > On Sunday 13 November 2005 22:02, Jeffrey A Law wrote: > > No great insights on how to make dbr_schedule CFG aware -- just > > remember that a filled delay slot can represent 3 different cases: > > > > 1. An extension of the block containing the sequence. > > > > 2. An extension of the block at the target of a branch. > > > > 3. An extension of the fall-thru block. > > > > 4. An entirely new basic block on its own. > > When can option 4 happen?? IIRC it occurs when there was only 1 insn in either the target or fall-thru block. When it gets sucked into the delay slot of a branch, then it is effectively its own basic block.
Or something along those lines -- it's been about 15 years since I've had to reconstruct CFGs from PA assembly code and branch traces ;) jeff
