linux-kernel - Re: [PATCH] ext4: improve str2hashbuf by processing 4-byte chunks

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Message-ID: <87a50flko1.fsf@igel.home>
Date: Fri, 21 Nov 2025 11:55:26 +0100
From: Andreas Schwab <schwab@...ux-m68k.org>
To: "Theodore Tso" <tytso@....edu>
Cc: David Laight <david.laight.linux@...il.com>,  Guan-Chun Wu
 <409411716@....tku.edu.tw>,  Andreas Dilger <adilger.kernel@...ger.ca>,
  linux-ext4@...r.kernel.org,  linux-kernel@...r.kernel.org,
  visitorckw@...il.com
Subject: Re: [PATCH] ext4: improve str2hashbuf by processing 4-byte chunks

On Nov 20 2025, Theodore Tso wrote:

> Secondly, it's not that a promotion happens before "any" arithmetic.
> If we add two 8-bit values together, promotion doesn't happen.

That is not true.  Integer promotion is applied individually to each
operand independent of context.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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