[patch] h8300: Add a new alternative to addhi3.

[Kazu Hirata]

Hi,

Attached is a patch to add a new alternative to addhi3.

If the constant appearing in (plus:HI (reg) (const_int)) is a multiple
of 256, we can do the addition without touching the lower half.

Tested on h8300 port.  Committed.

Kazu Hirata

2002-12-12  Kazu Hirata  <kazu@cs.umass.edu>

	* config/h8300/h8300.h (CONST_OK_FOR_J): New.
	(CONST_OK_FOR_LETTER_P): Use CONST_OK_FOR_J.
	* config/h8300/h8300.md (*addhi_h8300): Add a new alternative.
	(*addhi_h8300hs): Likewise.

Index: h8300.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.h,v
retrieving revision 1.122
diff -c -r1.122 h8300.h
*** h8300.h	11 Dec 2002 13:01:40 -0000	1.122
--- h8300.h	12 Dec 2002 21:08:25 -0000
***************
*** 461,466 ****
--- 461,467 ----
     Return 1 if VALUE is in the range specified by C.  */
  
  #define CONST_OK_FOR_I(VALUE) ((VALUE) == 0)
+ #define CONST_OK_FOR_J(VALUE) (((VALUE) & 0xff) == 0)
  #define CONST_OK_FOR_L(VALUE)				\
    (TARGET_H8300H || TARGET_H8300S			\
     ? (VALUE) == 1 || (VALUE) == 2 || (VALUE) == 4	\
***************
*** 472,477 ****
--- 473,479 ----
  
  #define CONST_OK_FOR_LETTER_P(VALUE, C)		\
    ((C) == 'I' ? CONST_OK_FOR_I (VALUE) :	\
+    (C) == 'J' ? CONST_OK_FOR_J (VALUE) :	\
     (C) == 'L' ? CONST_OK_FOR_L (VALUE) :	\
     (C) == 'N' ? CONST_OK_FOR_N (VALUE) :	\
     0)
Index: h8300.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.md,v
retrieving revision 1.119
diff -c -r1.119 h8300.md
*** h8300.md	11 Dec 2002 13:27:29 -0000	1.119
--- h8300.md	12 Dec 2002 21:08:30 -0000
***************
*** 762,793 ****
    ""
    "")
  
! (define_insn ""
!   [(set (match_operand:HI 0 "register_operand" "=r,r,r,r,&r")
! 	(plus:HI (match_operand:HI 1 "register_operand" "%0,0,0,0,g")
! 		 (match_operand:HI 2 "nonmemory_operand" "L,N,n,r,r")))]
    "TARGET_H8300"
    "@
     adds	%2,%T0
     subs	%G2,%T0
     add.b	%s2,%s0\;addx	%t2,%t0
     add.w	%T2,%T0
     mov.w	%T1,%T0\;add.w	%T2,%T0"
!   [(set_attr "length" "2,2,4,2,6")
!    (set_attr "cc" "none_0hit,none_0hit,clobber,set_zn,set_zn")])
  
! (define_insn ""
!   [(set (match_operand:HI 0 "register_operand" "=r,r,r,r")
! 	(plus:HI (match_operand:HI 1 "register_operand" "%0,0,0,0")
! 		 (match_operand:HI 2 "nonmemory_operand" "L,N,n,r")))]
    "TARGET_H8300H || TARGET_H8300S"
    "@
     adds	%2,%S0
     subs	%G2,%S0
     add.w	%T2,%T0
     add.w	%T2,%T0"
!   [(set_attr "length" "2,2,4,2")
!    (set_attr "cc" "none_0hit,none_0hit,set_zn,set_zn")])
  
  (define_split
    [(set (match_operand:HI 0 "register_operand" "")
--- 762,795 ----
    ""
    "")
  
! (define_insn "*addhi3_h8300"
!   [(set (match_operand:HI 0 "register_operand" "=r,r,r,r,r,&r")
! 	(plus:HI (match_operand:HI 1 "register_operand" "%0,0,0,0,0,g")
! 		 (match_operand:HI 2 "nonmemory_operand" "L,N,J,n,r,r")))]
    "TARGET_H8300"
    "@
     adds	%2,%T0
     subs	%G2,%T0
+    add.b	%t2,%t0
     add.b	%s2,%s0\;addx	%t2,%t0
     add.w	%T2,%T0
     mov.w	%T1,%T0\;add.w	%T2,%T0"
!   [(set_attr "length" "2,2,2,4,2,6")
!    (set_attr "cc" "none_0hit,none_0hit,clobber,clobber,set_zn,set_zn")])
  
! (define_insn "*addhi3_h8300hs"
!   [(set (match_operand:HI 0 "register_operand" "=r,r,r,r,r")
! 	(plus:HI (match_operand:HI 1 "register_operand" "%0,0,0,0,0")
! 		 (match_operand:HI 2 "nonmemory_operand" "L,N,J,n,r")))]
    "TARGET_H8300H || TARGET_H8300S"
    "@
     adds	%2,%S0
     subs	%G2,%S0
+    add.b	%t2,%t0
     add.w	%T2,%T0
     add.w	%T2,%T0"
!   [(set_attr "length" "2,2,2,4,2")
!    (set_attr "cc" "none_0hit,none_0hit,clobber,set_zn,set_zn")])
  
  (define_split
    [(set (match_operand:HI 0 "register_operand" "")