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Qt 5.3 Might Depend On SSE2 CPUs

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  • Qt 5.3 Might Depend On SSE2 CPUs

    Phoronix: Qt 5.3 Might Depend On SSE2 CPUs

    Thiago Macieira of Intel is coordinating a proposal to enable SSE2 by default for the 32-bit builds of the Qt tool-kit beginning with the Qt 5.3 release. This likely change is due to the V4 JIT engine generating floating-point math for Qt's QML only using SSE x86 registers...

    http://www.phoronix.com/vr.php?view=MTUxMDM

  • #2
    Before everyone freaks out

    Distros can just compile Qt to allow older processors. This only affects people who download the binaries straight from the Qt website.

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    • #3
      Although the blog post is correct, the title is extremely misleading.

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      • #4
        The whole article seems rubbish, it's like Michael was completely drunk. Half of the writing is nonsensical gibberish.

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        • #5
          Time to retire you Athlon XP ;-)

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          • #6
            I've an old Pentium3 (Slot 1) too, that's now pretty irrelevant for daily use. I just use it as a download manager. CPUs with SSE2 support are a really good minimum.

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            • #7
              Who cares 32bit at this time? Or Why dont chose an SSE2 codepath if SSE2 is aviable, or Ship 2 Libary Builds and a Loader.

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              • #8
                Re

                This is actually great news, even if he tries to make it sound bad.
                Hardware accelerated operations would improve the performance.
                People with such old processors don't use new software, so that pretty much doesn't have any negative results.

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                • #9
                  There is even talks about using SSE3 as minimum, which I think is very good, every 64bit capable CPU should support them:

                  http://lists.qt-project.org/pipermai...er/014087.html

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                  • #10
                    Originally posted by siavashserver View Post
                    every 64bit capable CPU should support them
                    Nope, SSE2 is the minimum for 64bit CPUs but i doubt that there are many out there of the SSE2 only CPUs. My Athlon 64 Clawhammer died some Month ago

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                    • #11
                      Originally posted by Alliancemd View Post
                      People with such old processors don't use new software, so that pretty much doesn't have any negative results.
                      Where the hell did you get that info from? So people with older CPUs don't use Razor-Qt or now LXDE-Qt? Also they don't use VLC or other Qt based software?
                      You realize that more software than just KDE is using Qt?

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                      • #12
                        Originally posted by Alliancemd View Post
                        People with such old processors don't use new software, so that pretty much doesn't have any negative results.
                        Bullshit. Specialy on Linux you are Forced to use new Software on older Systems.

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                        • #13
                          Originally posted by Vim_User View Post
                          Where the hell did you get that info from? So people with older CPUs don't use Razor-Qt or now LXDE-Qt? Also they don't use VLC or other Qt based software?
                          You realize that more software than just KDE is using Qt?
                          Believe it or not, my old Pentium3 750MHz box (bundled with 256MB of memory and an ATI Radeon 7000) is not even capable of running a bare minimum install of Openbox with light weight set of GTK applications smoothly, don't even mention running LXDE, XFCE, etc. CPU usage goes %100 even when only trying to play music and whole system goes nearly unusable. Now you are hoping to run VLC and play HD videos too on these old farts?

                          The best use that I have found for that box is a headless (home) FTP server and download manager.

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                          • #14
                            Backwards compatibility is a good thing, but it also slows down progress.
                            Anyway, here we are talking about a change in default compiling options, and as was already mentioned, people with non SSE2 CPUs can just recompile, or use a distro that compiles the package without SSE2. Just because Qt decides to use SSE2 by default,it doesn't mean the distributions have to follow upstream.

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                            • #15
                              Originally posted by Vim_User View Post
                              Where the hell did you get that info from? So people with older CPUs don't use Razor-Qt or now LXDE-Qt? Also they don't use VLC or other Qt based software?
                              You realize that more software than just KDE is using Qt?
                              Do these apps use Qt 5?

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