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Re: unexpected NOP encodings

From: Peter Bergner <bergner at linux dot ibm dot com>
To: Alan Modra <amodra at gmail dot com>, Jan Beulich <JBeulich at suse dot com>
Cc: binutils at sourceware dot org
Date: Mon, 24 Jun 2019 10:33:34 -0500
Subject: Re: unexpected NOP encodings
References: <5D10D6A0020000780023AA94@prv1-mh.provo.novell.com> <20190624150538.GA20628@bubble.grove.modra.org>

On 6/24/19 10:05 AM, Alan Modra wrote:
> On Mon, Jun 24, 2019 at 07:56:48AM -0600, Jan Beulich wrote:
>> All,
>>
>> is it known (and intended) that
> 
> No, you've found a bug.

Agreed, the group ending nop generated by the .p2align should match
the .machine that is currently in effect, so power8, not power6.

Peter


>> 	.text
>> 	.machine power8
>> power8:
>> 	nop
>> 	# The NOP inserted here is controlled by the "power6" machine
>> 	# setting below, not the one currently in effect.
>> 	.p2align 3
>> 	blr
>>
>> 	.machine power6
>>
>> doesn't produce the expected NOP encoding, because the encoding is
>> chosen only at the end of the assembly process (i.e. when the final
>> directive has already been seen and processed)?
>>
>> Jan
>>
>

References:
- unexpected NOP encodings
  - From: Jan Beulich
- Re: unexpected NOP encodings
  - From: Alan Modra

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