optabs.c (gen_move_insn): Move logic for synthesizing MODE_CC moves from here ...

	* optabs.c (gen_move_insn): Move logic for synthesizing MODE_CC
	moves from here ...
	* expr.c (emit_move_insn_1): ... to here.

From-SVN: r64015

1 files changed, 55 insertions, 0 deletions

diff --git a/gcc/expr.c b/gcc/expr.c
index c0119af..46b264e 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -3384,6 +3384,61 @@ emit_move_insn_1 (x, y)
       return get_last_insn ();
     }
 
+  /* Handle MODE_CC modes:  If we don't have a special move insn for this mode,
+     find a mode to do it in.  If we have a movcc, use it.  Otherwise,
+     find the MODE_INT mode of the same width.  */
+  else if (GET_MODE_CLASS (mode) == MODE_CC
+	   && mov_optab->handlers[(int) mode].insn_code == CODE_FOR_nothing)
+    {
+      enum insn_code insn_code;
+      enum machine_mode tmode = VOIDmode;
+      rtx x1 = x, y1 = y;
+
+      if (mode != CCmode
+	  && mov_optab->handlers[(int) CCmode].insn_code != CODE_FOR_nothing)
+	tmode = CCmode;
+      else
+	for (tmode = QImode; tmode != VOIDmode;
+	     tmode = GET_MODE_WIDER_MODE (tmode))
+	  if (GET_MODE_SIZE (tmode) == GET_MODE_SIZE (mode))
+	    break;
+
+      if (tmode == VOIDmode)
+	abort ();
+
+      /* Get X and Y in TMODE.  We can't use gen_lowpart here because it
+	 may call change_address which is not appropriate if we were
+	 called when a reload was in progress.  We don't have to worry
+	 about changing the address since the size in bytes is supposed to
+	 be the same.  Copy the MEM to change the mode and move any
+	 substitutions from the old MEM to the new one.  */
+
+      if (reload_in_progress)
+	{
+	  x = gen_lowpart_common (tmode, x1);
+	  if (x == 0 && GET_CODE (x1) == MEM)
+	    {
+	      x = adjust_address_nv (x1, tmode, 0);
+	      copy_replacements (x1, x);
+	    }
+
+	  y = gen_lowpart_common (tmode, y1);
+	  if (y == 0 && GET_CODE (y1) == MEM)
+	    {
+	      y = adjust_address_nv (y1, tmode, 0);
+	      copy_replacements (y1, y);
+	    }
+	}
+      else
+	{
+	  x = gen_lowpart (tmode, x);
+	  y = gen_lowpart (tmode, y);
+	}
+	  
+      insn_code = mov_optab->handlers[(int) tmode].insn_code;
+      return emit_insn (GEN_FCN (insn_code) (x, y));
+    }
+
   /* This will handle any multi-word or full-word mode that lacks a move_insn
      pattern.  However, you will get better code if you define such patterns,
      even if they must turn into multiple assembler instructions.  */