"Bingfeng Mei" <[EMAIL PROTECTED]> writes: > Of couse, for processors without long/short instructions, this copy > propagation is benefiical for performance by reducing unnecessary > dependency. Therefore, whether to apply this copy propagation is machine > dependent to some degree. > > What I do now is to add some check in tree-ssa-copy.c and tree-ssa-dom.c > for our target. But this is not very clean. My question is whether there > is better way to implement such machine-dependent tree-level > optimization (like hooks in RTL level). I believe there are other > processors that have the similar problem. What is common solution?
This should normally be done at the RTL level by making long constants more expensive in RTX_COSTS. With luck that will let gcse pick this up. Ian
