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Message-ID: <ffe2f454-992b-4dd4-822f-e91edbd934c1@gmail.com>
Date: Tue, 20 Jan 2026 19:56:05 -0500
From: Demi Marie Obenour <demiobenour@...il.com>
To: musl@...ts.openwall.com, Rich Felker <dalias@...c.org>,
Xan Phung <xan.phung@...il.com>
Subject: Re: [PATCH v1] wctype: reduce text size of iswalpha & iswpunct
by 53%
On 1/20/26 10:09, Rich Felker wrote:
> On Tue, Jan 20, 2026 at 01:35:26AM +1100, Xan Phung wrote:
(snip)
>> +
>> +int iswalpha(wint_t wc) {
>> + unsigned *huffm = (unsigned *)(table + PAGEH), target;
>
> The aliasing violation here isn't acceptable. Is there any good way to
> avoid it? I've only skimmed this submission so far; I assume the
> motivation is doing the popcount across 4 bytes, but I don't yet
> understand why popcount was chosen as the way of storing an index.
Do compilers optimize using memcpy() for type-punning?
--
Sincerely,
Demi Marie Obenour (she/her/hers)
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