On Tue, Sep 08, 2015 at 06:39:19PM +0000, Aditya K wrote: > IIUC, in the haifa-sched.c, the default scheduling algorithm seems to be > top-down (before reload). > Is there a way to schedule the other way (bottom up), or both ways? > > As a use case for bottom-up or some other heuristic: > Currently, the first priority in the selection is given to the longest path, > in some cases this may produce code with stalls at the end of the basic > block. Whereas in the case of combined top-down + bottom-up scheduling we > would end up having stalls in the middle of the basic block.
Why would that be better? Segher
