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[patch] h8300.md: Add a new pattern.
- From: Kazu Hirata <kazu at cs dot umass dot edu>
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 14 Feb 2003 11:23:07 -0500 (EST)
- Subject: [patch] h8300.md: Add a new pattern.
Hi,
Attached is a patch to add a new pattern. On H8/300H and H8S,
(A >> 1) | (A & 1)
can be done quite quickly with a carry flag. In terms of assembly
code, gcc without the patch generates
mov.l er0,er2
shlr.l er0
bld #0,r2l
bor #0,r0l
bst #0,r0l
With the patch
shlr.l er0
bor #0,r0l
bst #0,r0l
Tested on h8300 port. Committed.
Kazu Hirata
2003-02-14 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (*iorsi2_and_1_lshiftrt_1): New.
Index: h8300.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.md,v
retrieving revision 1.165
diff -u -r1.165 h8300.md
--- h8300.md 13 Feb 2003 16:33:00 -0000 1.165
+++ h8300.md 14 Feb 2003 12:53:36 -0000
@@ -2878,6 +2878,17 @@
(match_dup 0)))]
"operands[3] = gen_rtx_REG (HImode, REGNO (operands[2]));")
+(define_insn "*iorsi2_and_1_lshiftrt_1"
+ [(set (match_operand:SI 0 "register_operand" "=r")
+ (ior:SI (and:SI (match_operand:SI 1 "register_operand" "0")
+ (const_int 1))
+ (lshiftrt:SI (match_dup 1)
+ (const_int 1))))]
+ "TARGET_H8300H || TARGET_H8300S"
+ "shlr.l\\t%S0\;bor\\t#0,%w0\;bst\\t#0,%w0"
+ [(set_attr "length" "6")
+ (set_attr "cc" "clobber")])
+
;; Used to add the exponent of a float.
(define_insn "*addsi3_shift"