PR rtl-optimization/33644

	* cfgcleanup.c: Do not include dce.h.
	* cfgrtl.c (delete_insn_chain_and_edges): Resurrect.
	* combine.c (distribute_notes): Delete REG_LIBCALL_ID case.
	* dce.c (something_changed): Delete.
	(libcall_dead_p): New predicate.
	(delete_unmarked_insns): Use it to delete dead libcalls.
	Deal with REG_LIBCALL and REG_RETVAL notes.
	(prescan_libcall_for_dce): New function.
	(prescan_insns_for_dce): Use it to deal with libcalls.
	(mark_reg_dependencies): Do nothing special for libcalls.
	(dce_process_block): Likewise.
	(fast_dce): Delete unused local variable.
	(run_fast_dce): Do not return a value.
	* dce.h (struct df): Delete.
	(run_fast_dce): Adjust prototype.
	* optabs.c (libcall_id): Delete.
	(maybe_encapsulate_block): Do not emit REG_LIBCALL_ID notes.
	(emit_no_conflict_block): Do not look for REG_LIBCALL_ID notes.
	* reload1.c (reload): Delete REG_LIBCALL_ID case.
	* rtl.h (delete_insn_chain_and_edges): Resurrect prototype.
	* see.c (see_update_relevancy): Look for REG_LIBCALL and REG_RETVAL
	notes instead of REG_LIBCALL_ID notes.
	* reg-notes.def (LIBCALL_ID): Delete.
	* Makefile.in (see.o): Add dce.h dependency.
	(cfgcleanup.o): Remove dce.h dependency.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@129556 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 6 deletions

diff --git a/gcc/see.c b/gcc/see.c
index 0302af2d94f..8191b2d8103 100644
--- a/gcc/see.c
+++ b/gcc/see.c
@@ -3649,9 +3649,9 @@ see_update_defs_relevancy (rtx insn, struct df_ref *ref,
 
    The information of the u'th use is stored in use_entry[u] and the
    information of the d'th definition is stored in def_entry[d].
-   
+
    Currently all the uses are relevant for the optimization except for
-   uses that are in LIBCALL instructions.  */
+   uses that are in LIBCALL or RETVAL instructions.  */
 
 static void
 see_update_relevancy (void)
@@ -3676,13 +3676,12 @@ see_update_relevancy (void)
 	  unsigned int uid = INSN_UID (insn);
 	  if (INSN_P (insn))
 	    {
-	      
-	      /* If this is an insn in a libcall, do not touch the uses.  */
-	      if (find_reg_note (insn, REG_LIBCALL_ID, NULL_RTX))
+	      if (find_reg_note (insn, REG_LIBCALL, NULL_RTX)
+		  || find_reg_note (insn, REG_RETVAL, NULL_RTX))
 		et = NOT_RELEVANT;
 	      else
 		et = RELEVANT_USE;
-	      
+
 	      for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
 		{
 		  struct df_ref *use = *use_rec;