[Bug 77707] New: [ILK Bisected]Ogles2conform GL_sin_sin_float_frag_xvary.test fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77707

          Priority: high
            Bug ID: 77707
                CC: juhapekka.heikkila at gmail.com
          Assignee: idr at freedesktop.org
           Summary: [ILK Bisected]Ogles2conform
                    GL_sin_sin_float_frag_xvary.test 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 97657
  --> https://bugs.freedesktop.org/attachment.cgi?id=97657&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.
GL_sin_sin_vec2_frag_xvary.test and GL_sin_sin_vec3_frag_xvary.test also fail
with same bisect commit.
Bisect shows: a6860100b87415ab510d0d210cabfeeccebc9a0a is the first bad commit
commit a6860100b87415ab510d0d210cabfeeccebc9a0a
Author:     Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
AuthorDate: Fri Mar 28 15:28:33 2014 +0200
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Wed Apr 16 22:46:45 2014 -0700

    i965/fs: Change fs_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. GTF -width=64 -height=64 -run=GL/sin/sin_float_frag_xvary.test

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