expr.c (emit_move_insn_1): Handle arbitrary moves that are the same size as a word.

	* expr.c (emit_move_insn_1): Handle arbitrary moves that are
	the same size as a word.

	* regrename.c (find_oldest_value_reg): Take WORDS_BIG_ENDIAN /
	BYTES_BIG_ENDIAN into account.

From-SVN: r55482

gcc/ChangeLog

+Tue Jul 16 11:57:45 2002  J"orn Rennecke <joern.rennecke@superh.com>
+
+	* expr.c (emit_move_insn_1): Handle arbitrary moves that are
+	the same size as a word.
+
+	* regrename.c (find_oldest_value_reg): Take WORDS_BIG_ENDIAN /
+	BYTES_BIG_ENDIAN into account.
+
 Tue Jul 16 12:22:44 CEST 2002  Jan Hubicka  <jh@suse.cz>
 
 	* i386.md (prefetch): Fix for 64bit mode.

gcc/expr.c

@@ -3058,10 +3058,10 @@ emit_move_insn_1 (x, y)
       return get_last_insn ();
     }
 
-  /* This will handle any multi-word mode that lacks a move_insn pattern.
-     However, you will get better code if you define such patterns,
+  /* 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.  */
-  else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
+  else if (GET_MODE_SIZE (mode) >= UNITS_PER_WORD)
     {
       rtx last_insn = 0;
       rtx seq, inner;

gcc/regrename.c

@@ -1335,14 +1335,26 @@ find_oldest_value_reg (class, reg, vd)
     }
 
   for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno)
+    {
+      enum machine_mode oldmode = vd->e[i].mode;
+
     if (TEST_HARD_REG_BIT (reg_class_contents[class], i)
-	&& (vd->e[i].mode == mode
-	    || mode_change_ok (vd->e[i].mode, mode, i)))
+	&& (oldmode == mode
+	    || mode_change_ok (oldmode, mode, i)))
       {
-	rtx new = gen_rtx_raw_REG (mode, i);
+	int offset = GET_MODE_SIZE (oldmode) - GET_MODE_SIZE (mode);
+	int byteoffset = offset % UNITS_PER_WORD;
+	int wordoffset = offset - byteoffset;
+	rtx new;
+
+	offset = ((WORDS_BIG_ENDIAN ? wordoffset : 0)
+		  + (BYTES_BIG_ENDIAN ? byteoffset : 0));
+	new = (gen_rtx_raw_REG
+	       (mode, i + subreg_regno_offset (i, oldmode, offset, mode)));
 	ORIGINAL_REGNO (new) = ORIGINAL_REGNO (reg);
 	return new;
       }
+    }
 
   return NULL_RTX;
 }