[Bug 87103] New: Compilation is *very* slow.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87103

            Bug ID: 87103
           Summary: Compilation is *very* slow.
           Product: Mesa
           Version: 10.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: gonzhauser at yahoo.de
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Version: Mesa 10.1.3 Ubuntu package
Chipset: HM87
System Architecture: Ubuntu x86 64 bit.
xf86-video-intel: 2:2.99.910-ubuntu1.3
xserver: 1.15.1
mesa: 10.1.3
libdrm: 2.4.52
kernel: 3.8.11
Distribution: Ubuntu
Machine: Acer C720 with Celeron 2955U.
Display connector: Intel Haswell Integrated graphics controller


The following shader takes minutes to compile:

const int n = 49;
void prod(in vec4 a[n], in vec4 b[n], out vec4 result[4]) {
                result[0] = vec4(0);
                for(int i = 0; i < n; ++i) {
                        result[0] += a[i] * b[i];
                }


It works with n = 26, but from n = 27 it is very slow.

I can't upgrade because intel-linux-graphics-installer bails out with

No LSB modules are available.
polkit: Fetching org.01.linuxgraphics.installer permissions...
diagnostics-view.c/diagnostics_view_start: Running diagnostic Checking if Intel
graphics card available...
main-window.c/on_diagnostics_finished: Diagnostics finished with an error

Probably because I'm running a chroot Ubuntu on a Chromebook.

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