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Re: gold speed for small programs

From: Pádraig Brady
Subject: Re: gold speed for small programs
Date: Tue, 14 Dec 2010 09:53:50 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

On 14/12/10 07:04, Ralf Wildenhues wrote:
> Trying out gold (no LTO) on GCC's cc1, a log shows that the single
> biggest part (20%) of user time for such a medium sized program may be
> spent in SHA1 computation for the build id.  I think the SHA1 code in
> libiberty would benefit from an SSE implementation, such as the one
> found in git or described on <http://en.wikipedia.org/wiki/SHA-1>.
> Adding bug-gnulib in Cc: because that's where the libiberty SHA1
> implementation comes from.

Linus' portable SHA1 implementation is much faster:
There was talk of licensing changes, but nothing came of that.

There was also talk of an SSE version:
Although architecture specific, it's probably worth including given
the ubiquity of the architecture and the performance gain it provides.


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