Messages in this thread | | | Subject | Re: [patch 5/6] [RFD] timekeeping: Provide optional 128bit math | From | Chris Metcalf <> | Date | Fri, 9 Dec 2016 12:20:52 -0500 |
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On 12/9/2016 5:18 AM, Peter Zijlstra wrote: > On Fri, Dec 09, 2016 at 07:38:47AM +0100, Peter Zijlstra wrote: > >> Turns out using GCC-6.2.1 we have the same problem on i386, GCC doesn't >> recognise the 32x32 mults and generates crap. >> >> This used to work :/ > I tried: > > gcc-4.4: good > gcc-4.6, gcc-4.8, gcc-5.4, gcc-6.2: bad
I also found 4.4 was good on tilegx at recognizing the 32x32, and bad on the later versions I tested; I don't recall which specific later versions I tried, though.
-- Chris Metcalf, Mellanox Technologies http://www.mellanox.com
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