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Re: [PATCH 3/4] Add ILP32 support to aarch64

• From: Wilco Dijkstra <Wilco dot Dijkstra at arm dot com>
• To: "Ellcey, Steve" <Steve dot Ellcey at cavium dot com>, Joseph Myers<joseph at codesourcery dot com>
• Cc: nd <nd at arm dot com>, "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>
• Date: Thu, 3 Aug 2017 22:32:54 +0000
• Subject: Re: [PATCH 3/4] Add ILP32 support to aarch64
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Steve Ellecy wrote:> I hadn't considered that.  So maybe I could save the environment> (feholdexcept), do the calculation and see which exceptions, if any,> got raised.  Then restore the original environment (fesetenv) and raise> one or the other exceptions if needed.  Does that sound like a workable> solution?The fenv calls are slow on fast OoO cores so are a bad idea in fast paths.The generic implementation may well be faster... I'm not sure where therequirement of not raising inexact comes from (I don't see it in the definitionof lrint, and we generally don't care since inexact is set by almost every FPcalculation), but if it is absolutely required you'd special case values largerthan LONG_MAX.Wilco

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  • Re: [PATCH 3/4] Add ILP32 support to aarch64
    • From: Joseph Myers