[Mesa-dev] [RFC] i965: Delete brw_do_channel_expressions().

[Kenneth Graunke]

I re-ran these numbers with my SSO patches for shader-db and my
move_interpolation_to_top() pass fixed.  They're pretty similar:

(didn't run Haswell)

On Broadwell:

total instructions in shared programs: 11632138 -> 11641224 (0.08%)
instructions in affected programs: 1525250 -> 1534336 (0.60%)
helped: 1775
HURT: 5621

total cycles in shared programs: 144771824 -> 144924416 (0.11%)
cycles in affected programs: 115845654 -> 115998246 (0.13%)
helped: 20545
HURT: 36635

total loops in shared programs: 3345 -> 3345 (0.00%)
loops in affected programs: 0 -> 0
helped: 0
HURT: 0

total spills in shared programs: 2924 -> 3129 (7.01%)
spills in affected programs: 1002 -> 1207 (20.46%)
helped: 0
HURT: 7

total fills in shared programs: 4394 -> 4563 (3.85%)
fills in affected programs: 851 -> 1020 (19.86%)
helped: 0
HURT: 7

LOST:   18
GAINED: 31

On Skylake:

total instructions in shared programs: 11947696 -> 11956226 (0.07%)
instructions in affected programs: 1549219 -> 1557749 (0.55%)
helped: 1757
HURT: 5579

total cycles in shared programs: 134233408 -> 134336690 (0.08%)
cycles in affected programs: 105950250 -> 106053532 (0.10%)
helped: 20278
HURT: 36719

total loops in shared programs: 3209 -> 3209 (0.00%)
loops in affected programs: 0 -> 0
helped: 0
HURT: 0

total spills in shared programs: 3805 -> 3898 (2.44%)
spills in affected programs: 705 -> 798 (13.19%)
helped: 2
HURT: 61

total fills in shared programs: 5318 -> 5409 (1.71%)
fills in affected programs: 659 -> 750 (13.81%)
helped: 2
HURT: 61

LOST:   30
GAINED: 15
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