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From:   Andrey Abramov <st5pub@yandex.ru>
To:     Vineet Gupta <vineet.gupta1@synopsys.com>,
        David Laight <david.laight@aculab.com>,
        "'gregkh@linuxfoundation.org'" <gregkh@linuxfoundation.org>
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Subject: Re: [PATCH 5/5] Lib: sort.h: replace int size with size_t size in the swap function
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Date:   Mon, 01 Apr 2019 21:14:39 +0300
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01.04.2019, 21:02, "Vineet Gupta" <vineet.gupta1@synopsys.com>:
> On 4/1/19 7:46 AM, David Laight wrote:
>>  From: gregkh@linuxfoundation.org
>>>  Sent: 31 March 2019 11:54
>>  ...
>>>  Yes, "int" is a very nice variable for "size", you need to explain why
>>>  it is better to use size_t here please.
>>  Actually, on x86_64 you probably want 'unsigned int' to avoid the
>>  compiler having to generate a sign-extending register move if the
>>  value is ever used in a 64bit expression (eg an address calculation).
>
> Thats likely true for non x86 arches too (for certain on ARC). That is also the
> reason I dislike "bool", despite its "software engineering" benefits. Per ARC ABI
> (and likely others too) it is signed 8 bits and any use thereof, requires the
> compiler to generate an additional EXTB instruction to promote to 32-bit int with
> sign extension before using the value.
>
> -Vineet

George Spelvin wrote "So how about *deleting* the parameter instead?
That simplifies everything.", and he is right,
so I am just going to completely remove it.

Any objections?

--
With Best Regards,
Andrey Abramov