[Bug 109759] [BISECTED][REGRESSION][IVB, HSW] Font rendering problem in OpenGL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109759

--- Comment #15 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
Trying to replace the following sequence :

cmp(8).z.f0.0 vgrf11.y:D, vgrf10.xxxx:D, vgrf2.xyyy:D
...
cmp(8).nz.f0.0 null.x:D, vgrf11.yyyy:D, 0D

By:

cmp(8).z.f0.0 vgrf15.x:D, vgrf10.xxxx:D, vgrf2.yyyy:D
...
mov(8) vgrf11.y:D, vgrf15.yyyy:D

I wonder about 2 things :

 - can the value of the vgrf11 register be used in the '...' section of
instruction in between the 2 instructions we're trying to replace?

 - can the value of the accumulator we set in the first cmp in the replaced
snippet by altered in the '...' second of instruction?

I could see either of those things alter the behavior of shader.

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