From: Jan Hubicka <jh@suse.cz>
Date: Sun, 9 Jul 2023 13:14:54 +0000 (+0200)
Subject: Improve dumping of profile_count
X-Git-Tag: basepoints/gcc-15~7739
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6c1d7c4009bfe759719675ce3bc03ca503b9bf4;p=thirdparty%2Fgcc.git

Improve dumping of profile_count

Dumps of profile_counts are quite hard to interpret since they are 64bit fixed point
values.  In many cases one looks at a single function and it is better to think of
basic block frequency, that is how many times it is executed each invocatoin. This
patch makes CFG dumps to also print this info.

For example:
main()
{
	for (int i = 0; i < 10; i++)
		t();
}

the -fdump-tree-optimized-blocks-details now prints:
int main ()
{
  unsigned int ivtmp_1;
  unsigned int ivtmp_2;

;;   basic block 2, loop depth 0, count 97603128 (estimated locally, freq 1.0000), maybe hot
;;    prev block 0, next block 3, flags: (NEW, VISITED)
;;    pred:       ENTRY [always]  count:97603128 (estimated locally, freq 1.0000) (FALLTHRU,EXECUTABLE)
;;    succ:       3 [always]  count:97603128 (estimated locally, freq 1.0000) (FALLTHRU,EXECUTABLE)

;;   basic block 3, loop depth 1, count 976138697 (estimated locally, freq 10.0011), maybe hot
;;    prev block 2, next block 4, flags: (NEW, VISITED)
;;    pred:       3 [90.0% (guessed)]  count:878535568 (estimated locally, freq 9.0011) (TRUE_VALUE,EXECUTABLE)
;;                2 [always]  count:97603128 (estimated locally, freq 1.0000) (FALLTHRU,EXECUTABLE)
  # ivtmp_2 = PHI <ivtmp_1(3), 10(2)>
  t ();
  ivtmp_1 = ivtmp_2 + 4294967295;
  if (ivtmp_1 != 0)
    goto <bb 3>; [90.00%]
  else
    goto <bb 4>; [10.00%]
;;    succ:       3 [90.0% (guessed)]  count:878535568 (estimated locally, freq 9.0011) (TRUE_VALUE,EXECUTABLE)
;;                4 [10.0% (guessed)]  count:97603129 (estimated locally, freq 1.0000) (FALSE_VALUE,EXECUTABLE)

;;   basic block 4, loop depth 0, count 97603128 (estimated locally, freq 1.0000), maybe hot
;;    prev block 3, next block 1, flags: (NEW, VISITED)
;;    pred:       3 [10.0% (guessed)]  count:97603129 (estimated locally, freq 1.0000) (FALSE_VALUE,EXECUTABLE)
  return 0;
;;    succ:       EXIT [always]  count:97603128 (estimated locally, freq 1.0000) (EXECUTABLE)

}

Which makes it easier to see that the inner bb is executed 10 times per invocation

gcc/ChangeLog:

	* cfg.cc (check_bb_profile): Dump counts with relative frequency.
	(dump_edge_info): Likewise.
	(dump_bb_info): Likewise.
	* profile-count.cc (profile_count::dump): Add comma between quality and
	freq.

gcc/testsuite/ChangeLog:

	* gcc.dg/predict-22.c: Update template.
---

diff --git a/gcc/cfg.cc b/gcc/cfg.cc
index 740d4f3581d4..0de6d6b9e71d 100644
--- a/gcc/cfg.cc
+++ b/gcc/cfg.cc
@@ -475,9 +475,9 @@ check_bb_profile (basic_block bb, FILE * file, int indent)
 	{
 	  fprintf (file, ";; %sInvalid sum of incoming counts ",
 		   s_indent);
-	  sum.dump (file);
+	  sum.dump (file, fun);
 	  fprintf (file, ", should be ");
-	  bb->count.dump (file);
+	  bb->count.dump (file, fun);
 	  fprintf (file, "\n");
 	}
     }
@@ -525,7 +525,7 @@ dump_edge_info (FILE *file, edge e, dump_flags_t flags, int do_succ)
   if (e->count ().initialized_p () && do_details)
     {
       fputs (" count:", file);
-      e->count ().dump (file);
+      e->count ().dump (file, cfun);
     }
 
   if (e->flags && do_details)
@@ -808,7 +808,7 @@ dump_bb_info (FILE *outf, basic_block bb, int indent, dump_flags_t flags,
 	  if (bb->count.initialized_p ())
 	    {
 	      fputs (", count ", outf);
-	      bb->count.dump (outf);
+	      bb->count.dump (outf, cfun);
 	    }
 	  if (maybe_hot_bb_p (fun, bb))
 	    fputs (", maybe hot", outf);
diff --git a/gcc/profile-count.cc b/gcc/profile-count.cc
index 6bf9700d8db6..2c07ebc59428 100644
--- a/gcc/profile-count.cc
+++ b/gcc/profile-count.cc
@@ -94,7 +94,7 @@ profile_count::dump (char *buffer, struct function *fun) const
   else if (fun && initialized_p ()
 	   && fun->cfg
 	   && ENTRY_BLOCK_PTR_FOR_FN (fun)->count.initialized_p ())
-    sprintf (buffer, "%" PRId64 " (%s freq %.4f)", m_val,
+    sprintf (buffer, "%" PRId64 " (%s, freq %.4f)", m_val,
 	     profile_quality_display_names[m_quality],
 	     to_sreal_scale (ENTRY_BLOCK_PTR_FOR_FN (fun)->count).to_double ());
   else
diff --git a/gcc/testsuite/gcc.dg/predict-22.c b/gcc/testsuite/gcc.dg/predict-22.c
index f14c2b688613..1aed03fae792 100644
--- a/gcc/testsuite/gcc.dg/predict-22.c
+++ b/gcc/testsuite/gcc.dg/predict-22.c
@@ -55,5 +55,5 @@ foo (int x, int y, int z)
   baz (&f);
 }
 /* { dg-final { scan-tree-dump-times "Invalid sum" 0 "optimized"} } */
-/* { dg-final { scan-tree-dump-times "count 0 .precise.," 1 "optimized"} } */
+/* { dg-final { scan-tree-dump-times "count 0 .precise" 1 "optimized"} } */
 /* { dg-final { scan-rtl-dump-times "COLD_PARTITION" 1 "bbpart"} } */