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RFC: Optimize caller-saved register

From: "H.J. Lu" <hjl dot tools at gmail dot com>
To: GCC <gcc at gcc dot gnu dot org>
Date: Fri, 9 May 2008 08:52:57 -0700
Subject: RFC: Optimize caller-saved register

Hi,

Currently we save the entire register content for caller-saved
register, even though
only lower 4/8 bytes are used, as in the case of SSE math without
vectorizer. Is it
possible to only save the used portion of register content for
caller-saved register?

Thanks.


H.J.

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