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Re: gold speed for small programs

From: Ian Lance Taylor
Subject: Re: gold speed for small programs
Date: Tue, 14 Dec 2010 07:35:17 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Ralf Wildenhues <address@hidden> writes:

> 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>.

I think that would be great.

Since you bring it up, I copied the default of "sha1" from GNU ld, but
actually I don't think that is a very good default.  While a build ID
has some obvious uses, I have a hard time seeing why it matters that the
build ID is cryptographically secure.  I think we should consider adding
a new crc32 or crc64 option and making that the default.  The sha1
option would remain for those uses where cryptographic security is


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