Fix PR rtl-optimization/108274

Unlike other IPA passes, the ICF pass can be run at -O0 and some testcases
rely on this in the testsuite.  Now it effectively creates a tail call so
the DF information needs be updated in this case after epilogue creation.

gcc/
	PR rtl-optimization/108274
	* function.cc (thread_prologue_and_epilogue_insns): Also update the
	DF information for calls in a few more cases.

diff --git a/gcc/function.cc b/gcc/function.cc
index 27ba880..cfc4d2f 100644 (file)
--- a/gcc/function.cc
+++ b/gcc/function.cc
@@ -6266,7 +6266,10 @@ thread_prologue_and_epilogue_insns (void)
 
   /* Threading the prologue and epilogue changes the artificial refs in the
      entry and exit blocks, and may invalidate DF info for tail calls.  */
-  if (optimize)
+  if (optimize
+      || flag_optimize_sibling_calls
+      || flag_ipa_icf_functions
+      || in_lto_p)
     df_update_entry_exit_and_calls ();
   else
     {