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Re: [avr-gcc-list] [avr-as]: How to assembler a 24-bit integer?
From: |
Joerg Wunsch |
Subject: |
Re: [avr-gcc-list] [avr-as]: How to assembler a 24-bit integer? |
Date: |
Tue, 1 Nov 2011 11:33:56 +0100 (MET) |
In article <address@hidden> you write:
>For now, the reccommendation, I could give you is, to try to place all
>of your "data type" constant tables in the first 64k of memory by use of
>an appropriate linker script. As long as they reside within the first
>64k, a 16 bit pointer will do.
As Johann works on the named address space implementation in GCC, I
think he really wants a true 24-bit data type. The overall goal is to
be able to eventually replace all those workarounds ("use only the first
64 KiB", "use a 32-bit number instead") by a genuine 24-bit addressing,
so you can write something like:
__farflash const char *stringtable[] = { ... };
and have the compiler insert the correct (ELPM) instruction to access
them when referencing "stringtable" data.
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)