[gcc/devel/c++-coroutines] Add debug counter for IPA bits CP.

[Iain D Sandoe]

https://gcc.gnu.org/g:6c2583c14a8776e88f9834608686f34ec11f717f

commit 6c2583c14a8776e88f9834608686f34ec11f717f
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Aug 11 09:02:44 2020 +0200

    Add debug counter for IPA bits CP.
    
    gcc/ChangeLog:
    
            * dbgcnt.def (DEBUG_COUNTER): Add ipa_cp_bits.
            * ipa-cp.c (ipcp_store_bits_results): Use it when we store known
            bits for parameters.

Diff:
---
 gcc/dbgcnt.def |  1 +
 gcc/ipa-cp.c   | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/gcc/dbgcnt.def b/gcc/dbgcnt.def
index 3998c9636aa..cf8775b2b66 100644
--- a/gcc/dbgcnt.def
+++ b/gcc/dbgcnt.def
@@ -170,6 +170,7 @@ DEBUG_COUNTER (if_after_combine)
 DEBUG_COUNTER (if_after_reload)
 DEBUG_COUNTER (if_conversion)
 DEBUG_COUNTER (if_conversion_tree)
+DEBUG_COUNTER (ipa_cp_bits)
 DEBUG_COUNTER (ipa_sra_params)
 DEBUG_COUNTER (ipa_sra_retvalues)
 DEBUG_COUNTER (ira_move)
diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index 10cc59509d5..945a69977f3 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -123,6 +123,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-ssa-ccp.h"
 #include "stringpool.h"
 #include "attribs.h"
+#include "dbgcnt.h"
 
 template <typename valtype> class ipcp_value;
 
@@ -5788,9 +5789,13 @@ ipcp_store_bits_results (void)
 	  ipa_bits *jfbits;
 
 	  if (plats->bits_lattice.constant_p ())
-	    jfbits
-	      = ipa_get_ipa_bits_for_value (plats->bits_lattice.get_value (),
-					    plats->bits_lattice.get_mask ());
+	    {
+	      jfbits
+		= ipa_get_ipa_bits_for_value (plats->bits_lattice.get_value (),
+					      plats->bits_lattice.get_mask ());
+	      if (!dbg_cnt (ipa_cp_bits))
+		jfbits = NULL;
+	    }
 	  else
 	    jfbits = NULL;