Date: Mon, 2 May 2005 04:16:21 +0000 From: Joseph Koshy <joseph.koshy@gmail.com> To: Robert Watson <rwatson@freebsd.org> Cc: Mike Tancsa <mike@sentex.net> Subject: Re: 64bit CPUs Message-ID: <84dead7205050121166c326294@mail.gmail.com> In-Reply-To: <20050502044655.E78953@fledge.watson.org> References: <6.2.1.2.0.20050501094429.06974910@64.7.153.2> <20050502044655.E78953@fledge.watson.org>
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> RAM/address space is the big reason. In fact, applications=20 > compiled for 64-bits may well run slower than 32-bit ones=20 > running on the 64-bit kernel. On the other hand we have 16 registers to play with on the AMD64 and they can be used far more orthogonally than on the i386. That would cut down on the frequent register spills and reloads that are the bane of the i386 and thus help improve performance.
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