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[patch] h8300.md: Define define_asm_attributes.
- From: Kazu Hirata <kazu at cs dot umass dot edu>
- To: gcc-patches at gcc dot gnu dot org
- Date: Thu, 09 Oct 2003 09:14:25 -0400 (EDT)
- Subject: [patch] h8300.md: Define define_asm_attributes.
Hi,
Attached is a patch to define define_asm_attributes, "length" in
particular.
With this patch, many 16-bit offset branches in asm-intensive programs
like uClinux will collapse to 8-bit offset branch.
Tested on h8300 port with Roger's patch to optabs.c
Kazu Hirata
2003-10-09 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (define_asm_attributes): New.
Index: h8300.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.md,v
retrieving revision 1.236
diff -u -r1.236 h8300.md
--- h8300.md 29 Sep 2003 16:34:09 -0000 1.236
+++ h8300.md 5 Oct 2003 17:00:05 -0000
@@ -101,6 +101,12 @@
(define_attr "cc" "none,none_0hit,set_znv,set_zn,compare,clobber"
(const_string "clobber"))
+
+;; Provide the maximum length of an assembly instruction in an asm
+;; statement. The maximum length of 14 bytes is achieved on H8SX.
+
+(define_asm_attributes
+ [(set_attr "length" "14")])
;; ----------------------------------------------------------------------
;; MOVE INSTRUCTIONS