linux-kernel - Re: [patch 5/6] [RFD] timekeeping: Provide optional 128bit math

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Date:   Fri, 9 Dec 2016 11:18:00 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Liav Rehana <liavr@...lanox.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Richard Cochran <richardcochran@...il.com>,
        Parit Bhargava <prarit@...hat.com>,
        Laurent Vivier <lvivier@...hat.com>,
        "Christopher S. Hall" <christopher.s.hall@...el.com>
Subject: Re: [patch 5/6] [RFD] timekeeping: Provide optional 128bit math

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