reload.c (find_reloads): Mark new USE insns with QImode.

* reload.c (find_reloads): Mark new USE insns with QImode.
(find_reloads_toplev, find_reloads_address, subst_reg_equivs,
find_reloads_subreg_address): Likewise.
* regrename.c (note_sets, clear_dead_regs): Abort if pseudos are
encountered.
* reload1.c (reload_combine_note_use): Likewise, inside USEs and
CLOBBERs.
(reload): Make sure there are no USEs with mode other than
VOIDmode.  At the end, remove those marked with QImode.

From-SVN: r45889

1 files changed, 27 insertions, 5 deletions

diff --git a/gcc/reload.c b/gcc/reload.c
index 8e6d2b3afbf..cde34609127 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -3816,7 +3816,11 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
 	    if (GET_CODE (operand) == REG)
 	      {
 		if (modified[i] != RELOAD_WRITE)
-		  emit_insn_before (gen_rtx_USE (VOIDmode, operand), insn);
+		  /* We mark the USE with QImode so that we recognize
+		     it as one that can be safely deleted at the end
+		     of reload.  */
+		  PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, operand),
+					      insn), QImode);
 		if (modified[i] != RELOAD_READ)
 		  emit_insn_after (gen_rtx_CLOBBER (VOIDmode, operand), insn);
 	      }
@@ -4302,7 +4306,11 @@ find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest, insn,
 		 this substitution.  We have to emit a USE of the pseudo so
 		 that delete_output_reload can see it.  */
 	      if (replace_reloads && recog_data.operand[opnum] != x)
-		emit_insn_before (gen_rtx_USE (VOIDmode, x), insn);
+		/* We mark the USE with QImode so that we recognize it
+		   as one that can be safely deleted at the end of
+		   reload.  */
+		PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, x), insn),
+			  QImode);
 	      x = mem;
 	      i = find_reloads_address (GET_MODE (x), &x, XEXP (x, 0), &XEXP (x, 0),
 					opnum, type, ind_levels, insn);
@@ -4561,7 +4569,12 @@ find_reloads_address (mode, memrefloc, ad, loc, opnum, type, ind_levels, insn)
 		      && ! rtx_equal_p (tem, reg_equiv_mem[regno]))
 		    {
 		      *loc = tem;
-		      emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn);
+		      /* We mark the USE with QImode so that we
+			 recognize it as one that can be safely
+			 deleted at the end of reload.  */
+		      PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, ad),
+						  insn), QImode);
+
 		      /* This doesn't really count as replacing the address
 			 as a whole, since it is still a memory access.  */
 		    }
@@ -4892,7 +4905,11 @@ subst_reg_equivs (ad, insn)
 	    if (! rtx_equal_p (mem, reg_equiv_mem[regno]))
 	      {
 		subst_reg_equivs_changed = 1;
-		emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn);
+		/* We mark the USE with QImode so that we recognize it
+		   as one that can be safely deleted at the end of
+		   reload.  */
+		PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode, ad), insn),
+			  QImode);
 		return mem;
 	      }
 	  }
@@ -5724,7 +5741,12 @@ find_reloads_subreg_address (x, force_replace, opnum, type,
 		 this substitution.  We have to emit a USE of the pseudo so
 		 that delete_output_reload can see it.  */
 	      if (replace_reloads && recog_data.operand[opnum] != x)
-		emit_insn_before (gen_rtx_USE (VOIDmode, SUBREG_REG (x)), insn);
+		/* We mark the USE with QImode so that we recognize it
+		   as one that can be safely deleted at the end of
+		   reload.  */
+		PUT_MODE (emit_insn_before (gen_rtx_USE (VOIDmode,
+							 SUBREG_REG (x)),
+					    insn), QImode);
 	      x = tem;
 	    }
 	}