[Bug 87661] New: Move some literal constants to push constants

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87661

            Bug ID: 87661
           Summary: Move some literal constants to push constants
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: idr at freedesktop.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org
            Blocks: 77547

I have observed a shader that generates code like this:

mov(16)         g17<1>F         0.321569F                       { align1 1H };
cmp.ge.f0(16)   g15<1>D         -g10<8,8,1>F    0F              { align1 1H };
and.nz.f0(16)   null            g15<8,8,1>D     1D              { align1 1H
compacted };
mov(16)         g19<1>F         0.498039F                       { align1 1H };
mov(16)         g21<1>F         0.223529F                       { align1 1H };
mov(16)         g23<1>F         1F                              { align1 1H };
(-f0) sel(16)   g120<1>F        g17<8,8,1>F     0.12549F        { align1 1H };
(-f0) sel(16)   g122<1>F        g19<8,8,1>F     0.27451F        { align1 1H };
(-f0) sel(16)   g124<1>F        g21<8,8,1>F     0.192157F       { align1 1H };
(-f0) sel(16)   g126<1>F        g23<8,8,1>F     0F              { align1 1H };

If one set of literal constants were moved to push constants, we could save 4
instructions.  The entire shader in question was only 15 instructions, so that
would be worthwhile for that case.  In other cases it may be more problematic.

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