First phase of unifying the computation of profile scale factors/probabilities

and the actual scaling to use rounding divides:
- Add new macro GCOV_COMPUTE_SCALE to basic-block.h to compute the scale
factor/probability via a rounding divide.
- Change all locations that already perform rounding divides (inline or via RDIV)
to use the appropriate helper: GCOV_COMPUTE_SCALE, apply_probability or
combine_probabilities.
- Change ipa-cp.c truncating divides to use rounding divides.
- Add comments to all other locations (currently using truncating divides) to
switch them to one of the helpers so they use a rounding divide.

Next phase will be to replace the locations using truncating divides, marked
with a comment here, into rounding divides via the helper methods.

2013-04-08  Teresa Johnson  <tejohnson@google.com>

	* basic-block.h (GCOV_COMPUTE_SCALE): Define.
	* ipa-inline-analysis.c (param_change_prob): Use helper rounding divide
        methods.
	(estimate_edge_size_and_time): Add comment to suggest using rounding
	methods.
	(estimate_node_size_and_time): Ditto.
	(remap_edge_change_prob): Use helper rounding divide methods.
	* value-prof.c (gimple_divmod_fixed_value_transform): Ditto.
	(gimple_mod_pow2_value_transform): Ditto.
	(gimple_mod_subtract_transform): Ditto.
	(gimple_ic_transform): Ditto.
	(gimple_stringops_transform): Ditto.
	* stmt.c (conditional_probability): Ditto.
	(emit_case_dispatch_table): Ditto.
	* lto-cgraph.c (merge_profile_summaries): Ditto.
	* tree-optimize.c (execute_fixup_cfg): Ditto.
	* cfgcleanup.c (try_forward_edges): Ditto.
	* cfgloopmanip.c (scale_loop_profile): Ditto.
	(loopify): Ditto.
	(duplicate_loop_to_header_edge): Ditto.
	(lv_adjust_loop_entry_edge): Ditto.
	* tree-vect-loop.c (vect_transform_loop): Ditto.
	* profile.c (compute_branch_probabilities): Ditto.
	* cfgbuild.c (compute_outgoing_frequencies): Ditto.
	* lto-streamer-in.c (input_cfg): Ditto.
	* gimple-streamer-in.c (input_bb): Ditto.
	* ipa-cp.c (update_profiling_info): Ditto.
	(update_specialized_profile): Ditto.
	* tree-vect-loop-manip.c (slpeel_tree_peel_loop_to_edge): Ditto.
	* cfg.c (update_bb_profile_for_threading): Add comment to suggest using
        rounding methods.
	* sched-rgn.c (compute_dom_prob_ps): Ditto.
	(compute_trg_info): Ditto.
	* cfgrtl.c (force_nonfallthru_and_redirect): Ditto.
	(purge_dead_edges): Ditto.
	* loop-unswitch.c (unswitch_loop): Ditto.
	* cgraphclones.c (cgraph_clone_edge): Ditto.
	(cgraph_clone_node): Ditto.
	* tree-inline.c (copy_bb): Ditto.
	(copy_edges_for_bb): Ditto.
	(initialize_cfun): Ditto.
	(copy_cfg_body): Ditto.
	(expand_call_inline): Ditto.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@197595 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 2 insertions, 0 deletions

diff --git a/gcc/cgraphclones.c b/gcc/cgraphclones.c
index 3a2e3d679e2..fa6a9113a1e 100644
--- a/gcc/cgraphclones.c
+++ b/gcc/cgraphclones.c
@@ -102,6 +102,7 @@ cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n,
 		   int freq_scale, bool update_original)
 {
   struct cgraph_edge *new_edge;
+  /* Update this to use GCOV_COMPUTE_SCALE.  */
   gcov_type count = e->count * count_scale / REG_BR_PROB_BASE;
   gcov_type freq;
 
@@ -204,6 +205,7 @@ cgraph_clone_node (struct cgraph_node *n, tree decl, gcov_type count, int freq,
       if (new_node->count > n->count)
         count_scale = REG_BR_PROB_BASE;
       else
+        /* Update to use GCOV_COMPUTE_SCALE.  */
         count_scale = new_node->count * REG_BR_PROB_BASE / n->count;
     }
   else