On Tue, Apr 10, 2012 at 4:56 PM, Richard Guenther <rguent...@suse.de> wrote: > I'm sure more RTL optimiziation fallout will pop up - and I wonder > if we should simply avoid modifying the CFG all over the place and > instead do that in cleanup_cfg. Thus, in the if-conversion case, > simply do the speculation and leave the empty forwarder blocks > to be cleaned up by cleanup_cfg (or for CSE to leave unconditional > jumps conditional, as if (0/1), for example).
The problem with that could be that if(0|1) is not a valid instruction for every machine. You may need to set a register (pseudo, or hard reg) that may not be available (e.g. if it is live). Ciao! Steven
