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Date: Tue, 27 Aug 2013 13:28:36 -0400
From: Jeremy Huntwork <>
Subject: Re: Optimized C memset [v2]

On Aug 27, 2013, at 12:22 PM, Rich Felker <> wrote:

> Here's version 2 (filename version 6, in honor of glibc ;) of the
> memset code. I fixed a bug in the logic for coverage of the tail (the
> part past what's covered by the loop) for some values of n and
> alignments, and cleaned up the __GNUC__ usage a bit to use less
> #ifdeffery. The remaining test at the top for the __GNUC__ version is
> ugly, I admit, and should possibly just be removed and replaced by a
> configure check to add -D__may_alias__= to the CFLAGS if the compiler
> defines __GNUC__ but does not recognize __attribute__((__may_alias__))
> -- opinions on this?

Doing the test via configure and setting a flag seems more consistent with comments that have been made elsewhere on this list about the correct way to feature test.


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