On 06/19/2014 09:40 AM, Richard Henderson wrote: > It appears that regs_ever_live includes any register mentioned explicitly, and > thus the only registers it doesn't contain are those killed by the callees. > That should be an easier scan than the rtl, since we have those already > collected in the cgraph.
And I forgot to mention it might be worth while to notice simple recursion. Avoid the early exit path if caller == callee, despite the caller-save info not being valid. r~
