67ce9099bc
This patch enhances the ability of IPA to reason under what conditions loops in a function have known iteration counts or strides because it replaces single predicates which currently hold conjunction of predicates for all loops with vectors capable of holding multiple predicates, each with a cumulative frequency of loops with the property. This second property is then used by IPA-CP to much more aggressively boost its heuristic score for cloning opportunities which make iteration counts or strides of frequent loops compile time constant. gcc/ChangeLog: 2020-09-03 Martin Jambor <mjambor@suse.cz> * ipa-fnsummary.h (ipa_freqcounting_predicate): New type. (ipa_fn_summary): Change the type of loop_iterations and loop_strides to vectors of ipa_freqcounting_predicate. (ipa_fn_summary::ipa_fn_summary): Construct the new vectors. (ipa_call_estimates): New fields loops_with_known_iterations and loops_with_known_strides. * ipa-cp.c (hint_time_bonus): Multiply param_ipa_cp_loop_hint_bonus with the expected frequencies of loops with known iteration count or stride. * ipa-fnsummary.c (add_freqcounting_predicate): New function. (ipa_fn_summary::~ipa_fn_summary): Release the new vectors instead of just two predicates. (remap_hint_predicate_after_duplication): Replace with function remap_freqcounting_preds_after_dup. (ipa_fn_summary_t::duplicate): Use it or duplicate new vectors. (ipa_dump_fn_summary): Dump the new vectors. (analyze_function_body): Compute the loop property vectors. (ipa_call_context::estimate_size_and_time): Calculate also loops_with_known_iterations and loops_with_known_strides. Adjusted dumping accordinly. (remap_hint_predicate): Replace with function remap_freqcounting_predicate. (ipa_merge_fn_summary_after_inlining): Use it. (inline_read_section): Stream loopcounting vectors instead of two simple predicates. (ipa_fn_summary_write): Likewise. * params.opt (ipa-max-loop-predicates): New parameter. * doc/invoke.texi (ipa-max-loop-predicates): Document new param. gcc/testsuite/ChangeLog: 2020-09-03 Martin Jambor <mjambor@suse.cz> * gcc.dg/ipa/ipcp-loophint-1.c: New test. |
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