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Date: Wed, 18 Sep 2013 20:47:00 -0000
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From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: eliz@gnu.org
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In-reply-to: <83zjram6sw.fsf@gnu.org> (message from Eli Zaretskii on Wed, 18	Sep 2013 19:30:07 +0300)
Subject: Re: [PATCH+DOC] Print registers not saved in the frame as "<not saved>", instead of "<optimized out>".
References: <5200F55E.2050308@broadcom.com> <201308061318.r76DIMdd016369@glazunov.sibelius.xs4all.nl> <5200FECF.7030304@broadcom.com> <201308061541.r76FfYQN022875@glazunov.sibelius.xs4all.nl> <520142D9.4030304@redhat.com> <5208E3C8.7060107@broadcom.com> <5208E938.3080305@redhat.com> <201308122001.r7CK1862007934@glazunov.sibelius.xs4all.nl> <520E7255.7080206@redhat.com> <5211F25A.5070907@broadcom.com> <5228B15F.7060108@redhat.com> <5228B2D8.7060604@broadcom.com> <5237567C.8050406@redhat.com> <5239B2D8.4030403@broadcom.com> <5239CCB3.605@redhat.com> <83zjram6sw.fsf@gnu.org>
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> Date: Wed, 18 Sep 2013 19:30:07 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Also, shouldn't we mention optimizations as (the main) reason for
> registers being unavailable?

I don't consider optimisations as an important cause of registers not
being saved.  It is primarily a consequence of the fact that most ABIs
reserve some registers as "scratch" registers that don't need to be
saved.