This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: PATCH PING: stop ivopts from pessimizing code (PR42505)


> Ping?

what are the effects on the compile time? The tree-ssa-loop-ivopts.c part of the
patch is OK, assuming that they are negligible.

>> 2010-06-18  Sandra Loosemore  <>
>>     PR middle-end/42505
>>     gcc/
>>     * tree-ssa-loop-ivopts.c (determine_set_costs): Delete obsolete
>>     comments about cost model.
>>     (try_add_cand_for):  Add second strategy for choosing initial set
>>     based on original IVs, controlled by ORIGINALP argument.
>>     (get_initial_solution): Add ORIGINALP argument.
>>     (find_optimal_iv_set_1): New function, split from find_optimal_iv_set.
>>     (find_optimal_iv_set): Try two different strategies for choosing
>>     the IV set, and return the one with lower cost.

As for this change:

>>     * cfgloopanal.c (init_set_costs): Use call_used_regs rather than
>>     fixed_regs to count number of registers available for loop variables.

Should not we make call_used_regs unavailable only if there is a function call in the


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]