h8300.h (MODES_TIEABLE_P): Accept a combination of QImode and HImode on all architectures and a...

        * h8300.h (MODES_TIEABLE_P): Accept a combination of QImode and
        HImode on all architectures and a combination of HImode and SImode
        on H8/300H and H8/S.

From-SVN: r35372

gcc/ChangeLog

 2000-07-31  Kazu Hirata  <kazu@hxi.com>
 
+	* h8300.h (MODES_TIEABLE_P): Accept a combination of QImode and
+	HImode on all architectures and a combination of HImode and SImode
+	on H8/300H and H8/S.
+
 	* h8300.c (split_adds_subs): Rearrange code for conciseness.
 
 Mon Jul 31 12:27:55 MET DST 2000  Jan Hubicka  <jh@suse.cz>

gcc/config/h8300/h8300.h

@@ -308,7 +308,13 @@ do {				\
    when one has mode MODE1 and one has mode MODE2.
    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
    for any hard reg, then this must be 0 for correct output.  */
-#define MODES_TIEABLE_P(MODE1, MODE2)  ((MODE1) == (MODE2))
+#define MODES_TIEABLE_P(MODE1, MODE2)					\
+  ((MODE1) == (MODE2)							\
+   || ((MODE1) == HImode && (MODE2) == QImode)				\
+   || ((MODE1) == QImode && (MODE2) == HImode)				\
+   || ((TARGET_H8300H || TARGET_H8300S)					\
+       && (((MODE1) == SImode && (MODE2) == HImode)			\
+	   || ((MODE1) == HImode && (MODE2) == SImode))))
 
 /* Specify the registers used for certain standard purposes.
    The values of these macros are register numbers.  */