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RE: [patch,avr] device specific instruction support for avr devices

> -----Original Message-----
> From: []
> On Behalf Of S, Pitchumani
> Sent: Monday, March 03, 2014 11:21 AM
> To:
> Cc:
> Subject: [patch,avr] device specific instruction support for avr devices
> Hi,
> Few AVR Xmega devices have specific instruction support than the
> architecture
> it belongs to. For example atxmega128b1 device has RMW instructions
> LAS and LAT) support, but not all avrxmega6 devices have.
> Now, avr-gcc passes architecture name to assembler instead of device name.
> So,
> RMW instructions are not recognized (illegal opcode error) by assembler.
> I have attached a patch to address this issue in assembler.
> - It adds a option '-mrmw' to assembler.
> - Based on -mrmw option device specific instructions are added to current
>   instruction set (mcu_types[i].isa | AVR_ISA_RMW)
> Now assembler can recognize rmw instructions for respective devices.
> It is necessary to update gcc to pass -mrmw option to assembler if the
> selected device has rmw instructions. I'll send a patch for gcc as well.
> Please review the attached patch and give your suggestions.


I have updated the patch to include -mrmw option to binutils.
Patch for gcc update submitted in avr-gcc list.


2014-03-24 Pitchumani Sivanupandi <>
    * config/tc-avr.c: Add specified_mcu variable for selected mcu.
    (enum options): add OPTION_ISA_RMW for -mrmw option.
    (struct option md_longopts): Add mrmw option.
    (md_show_usage): add -mrmw option description.
    (md_parse_option): Update isa details if -mrmw option specified.
    * doc/c-avr.texi: Add doc for new option -mrmw.
2014-02-25 Pitchumani Sivanupandi <>
    * gas/avr/avr.exp: Run new tests.
    * gas/avr/rmw.d: Add test for additional ISA support.
    * gas/avr/rmw.s: Ditto.

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