Ping? David
On Sat, Aug 3, 2013 at 12:36 PM, Xinliang David Li <davi...@google.com> wrote: > Hi, GCC/i386 currently has about 73 boolean parameters/knobs (defined > in ix86_tune_features[], indexed by ix86_tune_indices) to perform > micro-arch specific performance tuning. However such settings are hard > coded (fixed with a given -mtune setting) and is very hard to do > performance experiment. > > The attached patch fixes the problem. The patch introduces a new > option -mtune-ctrl=. Its parameter is a comma separated list of > feature names to turn on associated features. Feature name can be > prefixed by ^ to do the opposite. For instance, > > -mtune-ctrl=prologue_using_move,epilogue_using_move,^pad_returns > > tells the compiler to use move instructions in prologue/epilogue > (instead of push/pop), and *not* pad return instructions. > > To facilitate the change, the feature tuning enums defined in i386.h > are moved to a new file x86-tune.def and this file can be used to > generate both the enums and names of the features. > > > Ok for trunk? > > > thanks, > > David > > 2013-08-03 Xinliang David Li <davi...@google.com> > > * config/i386/i386.opt: New option -mtune-ctrl=. > * config/i386/x86-tune.def: New file. > * config/i386/i386.h: include x86-tune.def. > * config/i386/i386.c (ix86_option_override_internal): > Parsing -mtune-ctrl= option and set tune features.
