Date: Wed, 27 Apr 2011 11:27:11 +0200 From: Marius Strobl <marius@alchemy.franken.de> To: Super Bisquit <superbisquit@gmail.com> Cc: freebsd-sparc64@freebsd.org Subject: Re: -mvis, Will it improve performance. Message-ID: <20110427092711.GA37921@alchemy.franken.de> In-Reply-To: <BANLkTimN1H5iwBiWorCJEp=evjh=aXL0FA@mail.gmail.com> References: <BANLkTimN1H5iwBiWorCJEp=evjh=aXL0FA@mail.gmail.com>
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On Tue, Apr 26, 2011 at 12:12:20AM -0400, Super Bisquit wrote: > Wonder if there is an advantage to the flag or not. VIS is the SIMD instruction set of US1 and later sun4u CPUs (and with a reduced set it's also available with sun4u), as such it should improve performance if applicable to the data. GCC automatically enables the use of VIS when optimizing for US1 (which as I already wrote before is the default for the FreeBSD system compiler) or later CPUs. So again, you don't need to worry about this when using the system compiler. Marius
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