> On x86_64, when the expected size of memcpy/memset is known (e.g, with > FDO), libcall strategy is used with the size is > 8192. This value is > hard coded, which makes it hard to do performance tuning. This patch > adds two new parameters to do that. Potential usage includes > per-application libcall strategy min-size tuning based on summary data > with FDO (e.g, instruction workset size). > > Bootstrap and tested on x86_64/linux. Ok for trunk? > > thanks, > > David > > > 2013-08-02 Xinliang David Li <davi...@google.com> > > * params.def: New parameters. > * config/i386/i386.c (ix86_option_override_internal): > Override default libcall size limit with parameters.
Hi, problem with this is that we introduce generic --param that is used only by x86 backend. I am not really guru on the command line options, but I think this is first time we try to do such thing. I wonder if 1) We want to introduce target specific params.def 2) We want to use usual -msomething= options 3) We want to go this way? Honza
