On 2010-03-31 11:04:03 +0200, Marc Glisse wrote: > IMHO this transformation mostly makes sense for the > -ffinite-math-only case where you can replace: "put a constant and > multiply/divide" by "put a constant and add/sub" and never care > about extracting the exponent, overflowing, or anything else. And in > that case, it does look like a nice optimization.
I suppose that this could be interesting only if a same register can be seen as a FP one and an integer one (for the addition on the exponent field), hoping that mixing both kinds of operations won't stall the pipeline. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)
