pan/mdg: Enable nir_opt_{move, sink}

I felt bad about the last patch regressing Midgard perf, so here's some
moar Midgard perf for you ^^

total instructions in shared programs: 97089 -> 97036 (-0.05%)
instructions in affected programs: 5230 -> 5177 (-1.01%)
helped: 53
HURT: 31
helped stats (abs) min: 1 max: 17 x̄: 4.40 x̃: 6
helped stats (rel) min: 0.61% max: 12.24% x̄: 7.74% x̃: 11.54%
HURT stats (abs)   min: 1 max: 8 x̄: 5.81 x̃: 8
HURT stats (rel)   min: 1.08% max: 13.79% x̄: 9.69% x̃: 11.11%
95% mean confidence interval for instructions value: -1.89 0.63
95% mean confidence interval for instructions %-change: -3.41% 0.80%
Inconclusive result (value mean confidence interval includes 0).

total bundles in shared programs: 45612 -> 45507 (-0.23%)
bundles in affected programs: 17331 -> 17226 (-0.61%)
helped: 139
HURT: 166
helped stats (abs) min: 1 max: 21 x̄: 3.76 x̃: 2
helped stats (rel) min: 0.85% max: 18.37% x̄: 6.38% x̃: 4.55%
HURT stats (abs)   min: 1 max: 10 x̄: 2.51 x̃: 1
HURT stats (rel)   min: 0.79% max: 31.25% x̄: 7.54% x̃: 4.55%
95% mean confidence interval for bundles value: -0.90 0.21
95% mean confidence interval for bundles %-change: 0.05% 2.34%
Inconclusive result (value mean confidence interval includes 0).

total quadwords in shared programs: 77275 -> 76952 (-0.42%)
quadwords in affected programs: 32314 -> 31991 (-1.00%)
helped: 142
HURT: 179
helped stats (abs) min: 1 max: 28 x̄: 4.38 x̃: 2
helped stats (rel) min: 0.34% max: 13.79% x̄: 4.29% x̃: 2.78%
HURT stats (abs)   min: 1 max: 6 x̄: 1.67 x̃: 2
HURT stats (rel)   min: 0.44% max: 16.67% x̄: 2.93% x̃: 2.63%
95% mean confidence interval for quadwords value: -1.56 -0.45
95% mean confidence interval for quadwords %-change: -0.78% 0.25%
Inconclusive result (%-change mean confidence interval includes 0).

total registers in shared programs: 7081 -> 6771 (-4.38%)
registers in affected programs: 2217 -> 1907 (-13.98%)
helped: 193
HURT: 75
helped stats (abs) min: 1 max: 6 x̄: 2.04 x̃: 1
helped stats (rel) min: 6.25% max: 62.50% x̄: 24.32% x̃: 20.00%
HURT stats (abs)   min: 1 max: 3 x̄: 1.11 x̃: 1
HURT stats (rel)   min: 7.14% max: 50.00% x̄: 17.17% x̃: 14.29%
95% mean confidence interval for registers value: -1.37 -0.94
95% mean confidence interval for registers %-change: -15.53% -9.89%
Registers are helped.

total threads in shared programs: 5036 -> 5152 (2.30%)
threads in affected programs: 185 -> 301 (62.70%)
helped: 93
HURT: 19
helped stats (abs) min: 1 max: 2 x̄: 1.49 x̃: 1
helped stats (rel) min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00%
HURT stats (abs)   min: 1 max: 2 x̄: 1.21 x̃: 1
HURT stats (rel)   min: 50.00% max: 50.00% x̄: 50.00% x̃: 50.00%
95% mean confidence interval for threads value: 0.82 1.25
95% mean confidence interval for threads %-change: 63.96% 85.14%
Threads are helped.

total loops in shared programs: 19 -> 19 (0.00%)
loops in affected programs: 0 -> 0
helped: 0
HURT: 0

total spills in shared programs: 2 -> 0
spills in affected programs: 2 -> 0
helped: 1
HURT: 0

total fills in shared programs: 15 -> 0
fills in affected programs: 15 -> 0
helped: 1
HURT: 0

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10652>

src/panfrost/midgard/midgard_compile.c

@@ -418,6 +418,15 @@ optimise_nir(nir_shader *nir, unsigned quirks, bool is_blend)
         NIR_PASS(progress, nir, nir_copy_prop);
         NIR_PASS(progress, nir, nir_opt_dce);
 
+        /* Backend scheduler is purely local, so do some global optimizations
+         * to reduce register pressure. */
+        nir_move_options move_all =
+                nir_move_const_undef | nir_move_load_ubo | nir_move_load_input |
+                nir_move_comparisons | nir_move_copies | nir_move_load_ssbo;
+
+        NIR_PASS_V(nir, nir_opt_sink, move_all);
+        NIR_PASS_V(nir, nir_opt_move, move_all);
+
         /* Take us out of SSA */
         NIR_PASS(progress, nir, nir_lower_locals_to_regs);
         NIR_PASS(progress, nir, nir_convert_from_ssa, true);