linux-kernel - Re: [PATCH] perf annotate: Remove precision for mnemonics

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Message-Id: <f807f61c-da67-14f2-a16c-d8ce6855703f@linux.vnet.ibm.com>
Date:   Wed, 15 Nov 2017 13:41:12 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, treeze.taeung@...il.com,
        linux-kernel@...r.kernel.org, dstence@...ibm.com,
        ravi.bangoria@...ux.vnet.ibm.com
Subject: Re: [PATCH] perf annotate: Remove precision for mnemonics


On 11/14/2017 06:34 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 14, 2017 at 08:55:40AM +0530, Ravi Bangoria escreveu:
>> There are many instructions, esp on powerpc, whose mnemonics are
>> longer than 6 characters. Using precision limit causes truncation
>> of such mnemonics.
>>
>> Fix this by removing precision limit. Note that, 'width' is still
>> 6, so alignment won't get affected for length <= 6.
>>
>> Before:
>>
>>     li     r11,-1
>>     xscvdp vs1,vs1
>>     add.   r10,r10,r11
>>
>> After:
>>
>>    li     r11,-1
>>    xscvdpsxds vs1,vs1
>>    add.   r10,r10,r11
> Ok, this improves the situation, as we stop truncating info, but I think
> that we should look for the longest instruction name and then use that
> to align the operands, will add that to my todo list if nobody does it
> first :-)

Hmm.. I could see longest one of 15 characters (f.e. AESKEYGENASSIST)
by a quick glance over list of instructions for x86 and powerpc. Need
to check for other archs.

> Thanks, applied.

Thanks,
Ravi