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Re: -mrelax does not work fully, 8 bit addressing issues

From: Kazu Hirata <kazu at cs dot umass dot edu>
To: ibrumm at arcor dot de
Cc: gcc at gcc dot gnu dot org
Date: Sat, 26 Oct 2002 08:59:49 -0400 (EDT)
Subject: Re: -mrelax does not work fully, 8 bit addressing issues
References: <9238900.1035625965556.JavaMail.ngmail@mx10.arcor-online.net>

Hi Ingmar,

> "-relax" does not work fully in GNU ld version 2.12.1
> It only reduces to 16bit instead of reducing to 8bit addresses

Actually, this is a gcc issue.

>   DMAC_DTCR0A |= 0x20;
>  206:	6a 0a ff 27       mov.b	@0xff27:16,r2l      ; here a bitset instruction
>  20a:	ca 20             or.b	#0x20,r2l           ; can be used instead:
>  20c:	6a 8a ff 27       mov.b	r2l,@0xff27:16      ; bset.b #5,@0xff:8

Use the following patch.  Another thing you can do is to use asm
statement.

http://h8300-hms.sourceforge.net/lab/h8300-volatileok.patch

Kazu Hirata

References:
- -mrelax does not work fully, 8 bit addressing issues
  - From: ibrumm

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