[Bug 77703] New: [ILK Bisected]Piglit glean_texCombine4 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77703

          Priority: high
            Bug ID: 77703
                CC: juhapekka.heikkila at gmail.com
          Assignee: idr at freedesktop.org
           Summary: [ILK Bisected]Piglit glean_texCombine4 fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 97654
  --> https://bugs.freedesktop.org/attachment.cgi?id=97654&action=edit
output

System Environment:
--------------------------
Platform: Ironlake
Libdrm:       
(master)libdrm-2.4.53-6-gd4083dc762a2974c35ecd16be995272bbb6d57b4
Mesa:        (master)ba6dcb3c2b8f516b120f591144bf6c3751f0e3f9
Xserver:   
(master)xorg-server-1.15.99.902-20-gc7011249d2abe6cc7af82ee4b79d8f6873444707
Xf86_video_intel:(master)2.99.911-89-g08e71e1820d6fcb6829b4ebd360beadc1f250295
Libva:        (staging)5e10a246287fa2dd3fae2bf756a5b33087cc097c
Libva_intel_driver:(staging)782b8afdda14f000874d8acf51c3e8c490d55773
Kernel:    (drm-intel-nightly)1e771b84e47085ef9b6efea1321e7cb5a8b2c06

Bug detailed description:
-----------------------------
It fails on Ironlake platforms with mesa master branch, and works well on 10.1
branch.
Bisect shows: 2dfbbeca50b95ccdd714d9baa4411c779f6a20d9 is the first bad commit.
commit 2dfbbeca50b95ccdd714d9baa4411c779f6a20d9
Author:     Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
AuthorDate: Fri Mar 28 15:28:31 2014 +0200
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Wed Apr 16 22:46:45 2014 -0700

    i965/vec4: Change vec4_visitor::emit_lrp to use MAC for gen<6

    This allows us to emit ADD/MUL/MAC instead of MUL/ADD/MUL/ADD,
    saving one instruction and two temporary registers.

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Matt Turner <mattst88 at gmail.com>
    Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>

Reproduce steps:
---------------------------- 
1. xinit
2. ./bin/glean -o -v -v -v -t +texCombine4

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