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Re: Structure-return bug on powerpc32 (patch)

From: Wim Lewis <wiml at hhhh dot org>
To: Andreas Tobler <andreast-list at fgznet dot ch>
Cc: libffi-discuss at sources dot redhat dot com
Date: Thu, 4 Jun 2009 00:00:51 -0700
Subject: Re: Structure-return bug on powerpc32 (patch)
References: <20090530014135.GA4607@underhill.hhhh.org> <4A242FB6.1000902@fgznet.ch>

On Jun 1, 2009, at 12:44 PM, Andreas Tobler wrote:

I'll get this patch into the gcc repo, I already have the approval.

Thanks!

The use of mtxer and stswx is a bit costy.

Hmm. Are we talking "pipeline stall" costly or "kernel trap" costly? My ppc docs are maddeningly vague on this point. Would it be faster as an explicit rotate/stbu/bdnz loop?

References:
- Re: Structure-return bug on powerpc32 (patch)
  - From: Wim Lewis
- Re: Structure-return bug on powerpc32 (patch)
  - From: Andreas Tobler

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