> Questions: > * shorten_branches() computes sizes of instructions so I know what the > distance is between a jump instr and its target label. But how do I know > what is the maximum distance each kind of branch can safely take? > bb-reorder.c assumes that its only when cold/hot partitions are crossed > it has to use indirect jumps, which is not the appropriate test in my case.
You cannot easily, it's buried in the architecture back-ends. > * do I get it right that shorten_branches() does not really modify > instructions but it helps to shorten branches by providing more accurate > insns lengths? Yes, but this should work automatically. IOW, as Ian said, you shouldn't need to do anything special. Maybe it's simply a latent bug in the PPC back-end. -- Eric Botcazou
