* flow.c (life_analysis_1): Do not clobber regs_ever_live after

        reload.  Never perform rescans of the insn chain after reload.
        (propagate_block): Do not delete insn or create new autoinc addressing
        modes after reload.
        * jump.c (jump_optimize): Unconditionally use the code that was
        previously conditional on PRESERVE_DEATH_INFO_REGNO_P.
        * reload1.c (reload): When reloading is finished, delete all
        REG_DEAD and REG_UNUSED notes.
        (emit_reload_insns): Delete all code that was conditional on
        PRESERVE_DEATH_INFO_REGNO_P.
        (no_longer_dead_regs): Delete variable.
        (reload_cse_delete_death_notes): Delete function.
        (reload_cse_no_longer_dead): Delete function.
        (reload_cse_regs_1): Delete all code to handle deletion of death
        notes.
        (reload_cse_noop_set_p): Likewise.
        (reload_cse_simplify_set): Likewise.
        (reload_cse_simplify_operands): Likewise.
        (reload_cse_move2add): Likewise.
        * reorg.c (used_spill_regs): Delete declaration.
        (max_label_num_after_reload): Delete declaration.
        (find_dead_or_set_registers): Don't assume that spill regs are
        dead at a CODE_LABEL.
        * rtlanal.c (dead_or_set_regno_p): Death notes are always accurate,
        even after reload.
        * sched.c (sched_analyze_insn): Likewise.
        (update_flow_info): Likewise.
        * haifa-sched.c (sched_analyze_insn): Likewise.
        (update_flow_info): Likewise.
        * tm.texi (PRESERVE_DEATH_INFO_REGNO_P): Delete documentation.
        * toplev.c (max_label_num_after_reload): Delete variable.
        (rest_of_compilation): Don't set max_label_num_after_reload.
        Call life_analysis after reload_cse_regs if optimizing.
        * config/gmicro/gmicro.h: Delete comment referring to
        PRESERVE_DEATH_INFO_REGNO_P.
        * config/i386/i386.h: Likewise.
        * config/m88k/m88k.h: Likewise.
        * config/m32r/m32r.h (PRESERVE_DEATH_INFO_REGNO_P): Delete definition.
        * config/sh/sh.h: Likewise.
Accurate REG_DEAD notes after reload.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23120 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1 insertions, 31 deletions

diff --git a/gcc/sched.c b/gcc/sched.c
index 78b879ff97b..1d81407c3f4 100644
--- a/gcc/sched.c
+++ b/gcc/sched.c
@@ -1554,27 +1554,6 @@ sched_analyze_insn (x, insn, loop_notes)
       REG_NOTES (insn) = loop_notes;
     }
 
-  /* After reload, it is possible for an instruction to have a REG_DEAD note
-     for a register that actually dies a few instructions earlier.  For
-     example, this can happen with SECONDARY_MEMORY_NEEDED reloads.
-     In this case, we must consider the insn to use the register mentioned
-     in the REG_DEAD note.  Otherwise, we may accidentally move this insn
-     after another insn that sets the register, thus getting obviously invalid
-     rtl.  This confuses reorg which believes that REG_DEAD notes are still
-     meaningful.
-
-     ??? We would get better code if we fixed reload to put the REG_DEAD
-     notes in the right places, but that may not be worth the effort.  */
-
-  if (reload_completed)
-    {
-      rtx note;
-
-      for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
-	if (REG_NOTE_KIND (note) == REG_DEAD)
-	  sched_analyze_2 (XEXP (note, 0), insn);
-    }
-
   EXECUTE_IF_SET_IN_REG_SET (reg_pending_sets, 0, i,
 			     {
 			       reg_last_sets[i] = insn;
@@ -3849,16 +3828,7 @@ update_flow_info (notes, first, last, orig_insn)
 		 register that was not needed by this instantiation of the
 		 pattern, so we can safely ignore it.  */
 	      if (insn == first)
-		{
-		  /* After reload, REG_DEAD notes come sometimes an
-		     instruction after the register actually dies.  */
-		  if (reload_completed && REG_NOTE_KIND (note) == REG_DEAD)
-		    {
-		      XEXP (note, 1) = REG_NOTES (insn);
-		      REG_NOTES (insn) = note;
-		      break;
-		    }
-			
+		{			
 		  if (REG_NOTE_KIND (note) != REG_UNUSED)
 		    abort ();