enabling sse2, 3dnow, etc. USE flags on unsupported chips

mikegpitt · Advocate Joined: 22 May 2004 Posts: 3224

Some packages like mplayer have optional USE flags for processor extensions like sse2, 3dnow, etc. If these are enabled and subsequently the code was run on a machine that didn't support this extension, will bad things happen, or will it simply ignore the optimizations?

nixnut · Posted: Tue Mar 18, 2008 6:24 pm Post subject:

Well, if you consider failing compiles bad, then yes bad things can happen. You might see binaries failing with illegal instruction error messages too.
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