> New optimization flags and new params need documentation in > gcc/doc/invoke.texi. >
Thanks. Added description in invoke.texi. The patch is in trunk. > The description of the --params suggest they provide fixed values - is > there no way to autodetect sensible values with a cost-model? I > hardly doubt that you can find two fixed values that apply for a whole > program... There are a lot of models/heuristics, but in the general case tile sizes remain kind of an open problem. For the time being, this option and its parameters are intended mostly to compiler developers interested to bring the loop to a specific form enabling further optimizations. Mircea.
