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profile.c (compute_branch_probabilities): Compute and dump the overlap between the static estimation and the...

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2011-10-20  Dehao Chen  <dehao@google.com>

	* profile.c (compute_branch_probabilities): Compute and dump the
	overlap between the static estimation and the instrumentation profile.
	(OVERLAP_BASE): New macro.
	(compute_frequency_overlap): New function

From-SVN: r180233
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Dehao Chen 2011-10-20 00:39:12 +00:00 committed by Dehao Chen
parent 8b6843f176
commit fa2988b4ff
2 changed files with 47 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-10-20 Dehao Chen <dehao@google.com>
* profile.c (compute_branch_probabilities): Compute and dump the
overlap between the static estimation and the instrumentation profile.
(OVERLAP_BASE): New macro.
(compute_frequency_overlap): New function
2011-10-19 Jakub Jelinek <jakub@redhat.com>
* config/i386/i386.c (expand_vec_perm_vpshufb2_vpermq_even_odd): Use

41
gcc/profile.c
View File

@ -437,6 +437,39 @@ read_profile_edge_counts (gcov_type *exec_counts)
return num_edges;
}
#define OVERLAP_BASE 10000
/* Compare the static estimated profile to the actual profile, and
return the "degree of overlap" measure between them.
Degree of overlap is a number between 0 and OVERLAP_BASE. It is
the sum of each basic block's minimum relative weights between
two profiles. And overlap of OVERLAP_BASE means two profiles are
identical. */
static int
compute_frequency_overlap (void)
{
gcov_type count_total = 0, freq_total = 0;
int overlap = 0;
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
count_total += bb->count;
freq_total += bb->frequency;
}
if (count_total == 0 || freq_total == 0)
return 0;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
overlap += MIN (bb->count * OVERLAP_BASE / count_total,
bb->frequency * OVERLAP_BASE / freq_total);
return overlap;
}
/* Compute the branch probabilities for the various branches.
Annotate them accordingly.
@ -607,7 +640,13 @@ compute_branch_probabilities (unsigned cfg_checksum, unsigned lineno_checksum)
}
}
if (dump_file)
dump_flow_info (dump_file, dump_flags);
{
int overlap = compute_frequency_overlap ();
dump_flow_info (dump_file, dump_flags);
fprintf (dump_file, "Static profile overlap: %d.%d%%\n",
overlap / (OVERLAP_BASE / 100),
overlap % (OVERLAP_BASE / 100));
}
total_num_passes += passes;
if (dump_file)