pan/mdg: Fix indirect UBO swizzles

Helps a lot of vertex shaders dramatically.

total instructions in shared programs: 48491 -> 48252 (-0.49%)
instructions in affected programs: 3091 -> 2852 (-7.73%)
helped: 30
HURT: 0
helped stats (abs) min: 1 max: 35 x̄: 7.97 x̃: 5
helped stats (rel) min: 0.57% max: 21.60% x̄: 7.98% x̃: 6.85%
95% mean confidence interval for instructions value: -11.11 -4.83
95% mean confidence interval for instructions %-change: -10.17% -5.80%
Instructions are helped.

total bundles in shared programs: 23392 -> 23105 (-1.23%)
bundles in affected programs: 2017 -> 1730 (-14.23%)
helped: 35
HURT: 0
helped stats (abs) min: 1 max: 34 x̄: 8.20 x̃: 7
helped stats (rel) min: 1.11% max: 34.69% x̄: 15.52% x̃: 18.42%
95% mean confidence interval for bundles value: -10.91 -5.49
95% mean confidence interval for bundles %-change: -19.28% -11.77%
Bundles are helped.

total quadwords in shared programs: 39586 -> 39611 (0.06%)
quadwords in affected programs: 1717 -> 1742 (1.46%)
helped: 5
HURT: 24
helped stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
helped stats (rel) min: 0.83% max: 3.57% x̄: 2.45% x̃: 2.78%
HURT stats (abs)   min: 1 max: 2 x̄: 1.25 x̃: 1
HURT stats (rel)   min: 1.00% max: 3.77% x̄: 2.17% x̃: 1.89%
95% mean confidence interval for quadwords value: 0.50 1.22
95% mean confidence interval for quadwords %-change: 0.61% 2.13%
Quadwords are HURT.

total registers in shared programs: 3337 -> 3272 (-1.95%)
registers in affected programs: 373 -> 308 (-17.43%)
helped: 34
HURT: 0
helped stats (abs) min: 1 max: 5 x̄: 1.91 x̃: 1
helped stats (rel) min: 6.25% max: 33.33% x̄: 16.76% x̃: 16.03%
95% mean confidence interval for registers value: -2.31 -1.51
95% mean confidence interval for registers %-change: -19.15% -14.37%
Registers are helped.

total threads in shared programs: 2593 -> 2615 (0.85%)
threads in affected programs: 22 -> 44 (100.00%)
helped: 21
HURT: 0
helped stats (abs) min: 1 max: 2 x̄: 1.05 x̃: 1
helped stats (rel) min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00%
95% mean confidence interval for threads value: 0.95 1.15
95% mean confidence interval for threads %-change: 100.00% 100.00%
Threads are [helped].

total loops in shared programs: 6 -> 6 (0.00%)
loops in affected programs: 0 -> 0
helped: 0
HURT: 0

total spills in shared programs: 17 -> 1 (-94.12%)
spills in affected programs: 16 -> 0
helped: 2
HURT: 0

total fills in shared programs: 35 -> 5 (-85.71%)
fills in affected programs: 30 -> 0
helped: 2
HURT: 0

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5781>

diff --git a/src/panfrost/midgard/midgard_compile.c b/src/panfrost/midgard/midgard_compile.c
index fe8b5c47a3f8b7c98ad15feed85dfd743e2e4530..56918951ce53bf32bc36f1b2ffde20687544b198 100644 (file)
--- a/src/panfrost/midgard/midgard_compile.c
+++ b/src/panfrost/midgard/midgard_compile.c
@@ -1330,6 +1330,11 @@ emit_ubo_read(
                 ins.src[2] = nir_src_index(ctx, indirect_offset);
                 ins.src_types[2] = nir_type_uint32;
                 ins.load_store.arg_2 = (indirect_shift << 5);
+
+                /* X component for the whole swizzle to prevent register
+                 * pressure from ballooning from the extra components */
+                for (unsigned i = 0; i < ARRAY_SIZE(ins.swizzle[2]); ++i)
+                        ins.swizzle[2][i] = 0;
         } else {
                 ins.load_store.arg_2 = 0x1E;
         }