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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: Mon, 06 Jan 2003 09:16:42 -0500 (EST)
- Subject: [patch] h8300.md: Add a new pattern.
Hi,
Attached is a patch to add a new pattern.
The new pattern optimizes
unsigned short A;
((unsigned long) A) << 15;
into
(A << 16) >> 1
This occurs in newlib.
Tested on h8300 port. Committed.
Kazu Hirata
2003-01-06 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (*twoshifts_l16_r1): New.
Index: h8300.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.md,v
retrieving revision 1.145
diff -u -r1.145 h8300.md
--- h8300.md 5 Jan 2003 23:04:48 -0000 1.145
+++ h8300.md 6 Jan 2003 14:00:33 -0000
@@ -2576,6 +2576,28 @@
(clobber (scratch:QI))])]
"")
+;; and:SI
+
+;; ((SImode) HImode) << 15
+
+(define_insn_and_split "*twoshifts_l16_r1"
+ [(set (match_operand:SI 0 "register_operand" "=r")
+ (and:SI (ashift:SI (match_operand:SI 1 "register_operand" "0")
+ (const_int 15))
+ (const_int 2147450880)))]
+ "(TARGET_H8300H || TARGET_H8300S)"
+ "#"
+ "&& reload_completed"
+ [(parallel [(set (match_dup 0)
+ (ashift:SI (match_dup 0)
+ (const_int 16)))
+ (clobber (scratch:QI))])
+ (parallel [(set (match_dup 0)
+ (lshiftrt:SI (match_dup 0)
+ (const_int 1)))
+ (clobber (scratch:QI))])]
+ "")
+
;; plus:SI
(define_insn "*addsi3_lshiftrt_16_zexthi"