git.libre-soc.org Git - mesa.git/log

pan/bi: Sketch out instruction word packing

Instructions are 78-bits with some seriously suspicious packing
requirements but hey, gotta save 'em bits.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4242>

pan/bi: Setup initial clause packing

At the moment, we just iterate the clauses in the post-RA, post-sched IR
and generate a dummy clause corresponding, passing the results to the
disassembler to verify.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4242>

docs: update calendar, add news item, and link releases notes for 20.0.2

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4236>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4236>

docs/relnotes: Add sha256 sums for 20.0.2

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4236>

Docs: Add release notes for 20.0.2

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4236>

ci: Disable tests that showed intermittent fails on a530 in day 1.

Link: https://gitlab.freedesktop.org/mesa/mesa/issues/2649
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4231>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4231>

ci: Ban the recent popular freedreno a630 flakes.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4231>

radv: remove wrong assert that checks compute subgroup size

Ooops. For some reasons, I have been confused with Wave32 on GFX10,
but it's still possible to require a specific subgroup size if
only Wave64 is supported.

Fixes: 672d1061998 ("radv/gfx10: fix required subgroup size with VK_EXT_subgroup_size_control")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4227>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4227>

anv: Swizzle fast-clear values

Starting with Gen12, we can fast-clear a lot more surface formats and we
are suddenly in the position of having to fast-clear surfaces with
formats with an implicit swizzle such as VK_FORMAT_R4G4B4A4_UNORM_PACK16
which is represented as ISL_FORMAT_A4B4G4R4 with a BGRA swizzle. In
order for blorp to do the fast-clear color conversion for us, it needs
a properly swizzled color.

This fixes the following Vulkan CTS groups on TGL:

- dEQP-VK.pipeline.blend.format.b4g4r4a4_unorm_pack16.*
- dEQP-VK.api.image_clearing.core.clear_color_image.*.b4g4r4a4*

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4218>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4218>

intel/blorp: Add support for swizzling fast-clear colors

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4218>

soft-fp64: Split a block that was missing a cast on a comparison

This function has code like:

   if (0x7FD <= zExp) {
      if ((0x7FD < zExp) ||
         ((zExp == 0x7FD) &&
            (0x001FFFFFu == zFrac0 && 0xFFFFFFFFu == zFrac1) &&
               increment)) {
         ...
return ...;
      }
      if (zExp < 0) {

I saw that, and I thought, "Uh... what?  Dead code?"  I thought it was a
bit fishy, so I grabbed the Berkeley SoftFloat Library 3e code, and
there is similar code in softfloat_roundPackToF64
(source/s_roundPackToF64.c), but it has an extra (uint16_t) cast in the
first comparison.  This is basicially a shortcut for

   if (zExp < 0 || zExp >= 0x7FD) {

So, having the nesting kind of makes sense. On a CPU, nesting the flow
control can be an optimization.  On a GPU, it's just fail.  Split the
block so that we don't need the uint16_t cast magic.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 683638 -> 658127 (-3.73%)
instructions in affected programs: 666839 -> 641328 (-3.83%)
helped: 92
HURT: 0
helped stats (abs) min: 26 max: 2456 x̄: 277.29 x̃: 144
helped stats (rel) min: 3.21% max: 4.22% x̄: 3.79% x̃: 3.90%
95% mean confidence interval for instructions value: -345.84 -208.75
95% mean confidence interval for instructions %-change: -3.86% -3.73%
Instructions are helped.

total cycles in shared programs: 5458858 -> 5344600 (-2.09%)
cycles in affected programs: 5360114 -> 5245856 (-2.13%)
helped: 92
HURT: 0
helped stats (abs) min: 126 max: 10300 x̄: 1241.93 x̃: 655
helped stats (rel) min: 1.71% max: 2.37% x̄: 2.12% x̃: 2.17%
95% mean confidence interval for cycles value: -1539.93 -943.94
95% mean confidence interval for cycles %-change: -2.16% -2.08%
Cycles are helped.

Fixes: f111d72596c ("glsl: Add "built-in" functions to do add(fp64, fp64)")
Reviewed-by: Matt Turner <mattst88@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Common code optimization for differing sign case

This is basically the same ideas from the previous 4 commits applied
to the aSign != bSign part... and all smashed into one commit.

The shader hurt for spill and / or fills is from
KHR-GL46.gpu_shader_fp64.builtin.inverse_dmat4.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake
total instructions in shared programs: 787258 -> 683638 (-13.16%)
instructions in affected programs: 725435 -> 621815 (-14.28%)
helped: 74
HURT: 0
helped stats (abs) min: 152 max: 10261 x̄: 1400.27 x̃: 975
helped stats (rel) min: 11.61% max: 20.92% x̄: 15.40% x̃: 14.86%
95% mean confidence interval for instructions value: -1740.11 -1060.43
95% mean confidence interval for instructions %-change: -16.01% -14.79%
Instructions are helped.

total cycles in shared programs: 6483227 -> 5458858 (-15.80%)
cycles in affected programs: 6051245 -> 5026876 (-16.93%)
helped: 74
HURT: 0
helped stats (abs) min: 1566 max: 95474 x̄: 13842.82 x̃: 9757
helped stats (rel) min: 13.94% max: 23.26% x̄: 17.98% x̃: 17.57%
95% mean confidence interval for cycles value: -17104.25 -10581.40
95% mean confidence interval for cycles %-change: -18.61% -17.35%
Cycles are helped.

total spills in shared programs: 553 -> 445 (-19.53%)
spills in affected programs: 553 -> 445 (-19.53%)
helped: 1
HURT: 0

total fills in shared programs: 1307 -> 1323 (1.22%)
fills in affected programs: 1307 -> 1323 (1.22%)
helped: 0
HURT: 1

Ice Lake
total instructions in shared programs: 781216 -> 678470 (-13.15%)
instructions in affected programs: 720088 -> 617342 (-14.27%)
helped: 74
HURT: 0
helped stats (abs) min: 153 max: 8863 x̄: 1388.46 x̃: 975
helped stats (rel) min: 11.24% max: 21.03% x̄: 15.47% x̃: 15.01%
95% mean confidence interval for instructions value: -1703.57 -1073.35
95% mean confidence interval for instructions %-change: -16.09% -14.85%
Instructions are helped.

total cycles in shared programs: 6464085 -> 5453997 (-15.63%)
cycles in affected programs: 6031771 -> 5021683 (-16.75%)
helped: 74
HURT: 0
helped stats (abs) min: 1552 max: 90317 x̄: 13649.84 x̃: 9650
helped stats (rel) min: 13.84% max: 23.11% x̄: 17.83% x̃: 17.41%
95% mean confidence interval for cycles value: -16802.89 -10496.79
95% mean confidence interval for cycles %-change: -18.46% -17.21%
Cycles are helped.

total spills in shared programs: 279 -> 368 (31.90%)
spills in affected programs: 279 -> 368 (31.90%)
helped: 0
HURT: 1

total fills in shared programs: 973 -> 1155 (18.71%)
fills in affected programs: 973 -> 1155 (18.71%)
helped: 0
HURT: 1

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Move common code out of both branches of an if-statement

The previous two commits were just setting the scene for this change.

The mix(..., __propagateFloat64NaN(a, b), propagate) statements are not
identical in the two halves, but they are equivalent.  The first clause
of the mix in the else-branch is trivally ±Inf.  The first clause in the
then-branch __packFloat64(aSign, aExp, aFracHi, aFracLo).  The
preceeding conditions prove that aExp=0x7ff, aFracHi=0, and aFracLo=0.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 819560 -> 787258 (-3.94%)
instructions in affected programs: 757737 -> 725435 (-4.26%)
helped: 74
HURT: 0
helped stats (abs) min: 43 max: 3545 x̄: 436.51 x̃: 296
helped stats (rel) min: 3.54% max: 6.16% x̄: 4.52% x̃: 4.36%
95% mean confidence interval for instructions value: -548.42 -324.61
95% mean confidence interval for instructions %-change: -4.68% -4.37%
Instructions are helped.

total cycles in shared programs: 6817254 -> 6483227 (-4.90%)
cycles in affected programs: 6385272 -> 6051245 (-5.23%)
helped: 74
HURT: 0
helped stats (abs) min: 430 max: 33271 x̄: 4513.88 x̃: 3047
helped stats (rel) min: 4.28% max: 7.45% x̄: 5.48% x̃: 5.31%
95% mean confidence interval for cycles value: -5610.46 -3417.30
95% mean confidence interval for cycles %-change: -5.65% -5.32%
Cycles are helped.

total spills in shared programs: 591 -> 553 (-6.43%)
spills in affected programs: 591 -> 553 (-6.43%)
helped: 1
HURT: 0

total fills in shared programs: 1353 -> 1307 (-3.40%)
fills in affected programs: 1353 -> 1307 (-3.40%)
helped: 1
HURT: 0

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Use absolute value of expDiff

In one branch we know that expDiff is already positive.

In the other branch we know the expDiff is negative.  Previously in that
branch the code was -(expDiff + 1).  This is equvialent to (-expDiff) -
1, and since expDiff is negative, abs(expDiff) - 1.

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 818246 -> 819560 (0.16%)
instructions in affected programs: 756423 -> 757737 (0.17%)
helped: 1
HURT: 73
helped stats (abs) min: 1205 max: 1205 x̄: 1205.00 x̃: 1205
helped stats (rel) min: 1.36% max: 1.36% x̄: 1.36% x̃: 1.36%
HURT stats (abs)   min: 2 max: 149 x̄: 34.51 x̃: 27
HURT stats (rel)   min: 0.14% max: 1.09% x̄: 0.41% x̃: 0.30%
95% mean confidence interval for instructions value: -16.56 52.07
95% mean confidence interval for instructions %-change: 0.30% 0.47%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 6816686 -> 6817254 (<.01%)
cycles in affected programs: 6384704 -> 6385272 (<.01%)
helped: 37
HURT: 37
helped stats (abs) min: 30 max: 5790 x̄: 289.05 x̃: 102
helped stats (rel) min: 0.04% max: 0.86% x̄: 0.29% x̃: 0.31%
HURT stats (abs)   min: 2 max: 1020 x̄: 304.41 x̃: 232
HURT stats (rel)   min: <.01% max: 1.58% x̄: 0.55% x̃: 0.43%
95% mean confidence interval for cycles value: -165.37 180.72
95% mean confidence interval for cycles %-change: <.01% 0.27%
Inconclusive result (value mean confidence interval includes 0).

total spills in shared programs: 705 -> 591 (-16.17%)
spills in affected programs: 705 -> 591 (-16.17%)
helped: 1
HURT: 0

total fills in shared programs: 1501 -> 1353 (-9.86%)
fills in affected programs: 1501 -> 1353 (-9.86%)
helped: 1
HURT: 0

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Rename aFrac and bFrac variables

Exchanging aFracHi / bFracHi and aFracLo / bFracLo should not affect the
result of the later call to __add64.

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

v2: Fix a typo in a comment.  Noticed by Matt.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 812094 -> 818246 (0.76%)
instructions in affected programs: 750271 -> 756423 (0.82%)
helped: 0
HURT: 74
HURT stats (abs)   min: 7 max: 520 x̄: 83.14 x̃: 59
HURT stats (rel)   min: 0.52% max: 1.48% x̄: 0.89% x̃: 0.84%
95% mean confidence interval for instructions value: 63.96 102.31
95% mean confidence interval for instructions %-change: 0.83% 0.95%
Instructions are HURT.

total cycles in shared programs: 6797157 -> 6816686 (0.29%)
cycles in affected programs: 6365175 -> 6384704 (0.31%)
helped: 0
HURT: 74
HURT stats (abs)   min: 16 max: 1690 x̄: 263.91 x̃: 181
HURT stats (rel)   min: 0.14% max: 0.68% x̄: 0.32% x̃: 0.27%
95% mean confidence interval for cycles value: 199.74 328.07
95% mean confidence interval for cycles %-change: 0.29% 0.36%
Cycles are HURT.

total spills in shared programs: 703 -> 705 (0.28%)
spills in affected programs: 703 -> 705 (0.28%)
helped: 0
HURT: 1

total fills in shared programs: 1499 -> 1501 (0.13%)
fills in affected programs: 1499 -> 1501 (0.13%)
helped: 0
HURT: 1

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Combine an if-statement into the preceeding else-clause

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 812590 -> 812094 (-0.06%)
instructions in affected programs: 672135 -> 671639 (-0.07%)
helped: 57
HURT: 0
helped stats (abs) min: 1 max: 32 x̄: 8.70 x̃: 7
helped stats (rel) min: <.01% max: 0.49% x̄: 0.12% x̃: 0.09%
95% mean confidence interval for instructions value: -10.46 -6.94
95% mean confidence interval for instructions %-change: -0.15% -0.09%
Instructions are helped.

total cycles in shared programs: 6798039 -> 6797157 (-0.01%)
cycles in affected programs: 5810059 -> 5809177 (-0.02%)
helped: 54
HURT: 2
helped stats (abs) min: 2 max: 68 x̄: 16.44 x̃: 12
helped stats (rel) min: <.01% max: 0.12% x̄: 0.03% x̃: 0.02%
HURT stats (abs) min: 2 max: 4 x̄: 3.00 x̃: 3
HURT stats (rel) min: <.01% max: <.01% x̄: <.01% x̃: <.01%
95% mean confidence interval for cycles value: -19.50 -12.00
95% mean confidence interval for cycles %-change: -0.03% -0.02%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Reformat after previous commit

Convert

   } else if (...) {
      ...
   } else {
      ...
   }

to

   } else {
      if (...) {
         ...
      } else {
         ...
      }
   }

Not doing this reformatting in the previous commit makes the previous
commit easier to review, and doing it before the next commit makes the
next commit easier to review.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Delete a redundant condition check

Previous condition checks already guaranteen that expDiff != 0 and
!(expDiff > 0), so expDiff < 0 is the only option left.

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 815491 -> 812590 (-0.36%)
instructions in affected programs: 753668 -> 750767 (-0.38%)
helped: 74
HURT: 0
helped stats (abs) min: 3 max: 281 x̄: 39.20 x̃: 25
helped stats (rel) min: 0.29% max: 0.73% x̄: 0.42% x̃: 0.40%
95% mean confidence interval for instructions value: -48.50 -29.91
95% mean confidence interval for instructions %-change: -0.45% -0.40%
Instructions are helped.

total cycles in shared programs: 6813681 -> 6798039 (-0.23%)
cycles in affected programs: 6381699 -> 6366057 (-0.25%)
helped: 74
HURT: 0
helped stats (abs) min: 24 max: 1488 x̄: 211.38 x̃: 149
helped stats (rel) min: 0.20% max: 0.44% x̄: 0.26% x̃: 0.25%
95% mean confidence interval for cycles value: -261.68 -161.08
95% mean confidence interval for cycles %-change: -0.28% -0.25%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Just let the subtraction happen when the result will be zero

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 815717 -> 815491 (-0.03%)
instructions in affected programs: 735489 -> 735263 (-0.03%)
helped: 39
HURT: 34
helped stats (abs) min: 2 max: 192 x̄: 20.79 x̃: 12
helped stats (rel) min: 0.01% max: 0.46% x̄: 0.26% x̃: 0.28%
HURT stats (abs)   min: 1 max: 65 x̄: 17.21 x̃: 11
HURT stats (rel)   min: <.01% max: 1.11% x̄: 0.35% x̃: 0.19%
95% mean confidence interval for instructions value: -10.40 4.21
95% mean confidence interval for instructions %-change: -0.07% 0.13%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 6820707 -> 6813681 (-0.10%)
cycles in affected programs: 6388725 -> 6381699 (-0.11%)
helped: 51
HURT: 23
helped stats (abs) min: 3 max: 1837 x̄: 184.76 x̃: 120
helped stats (rel) min: <.01% max: 0.48% x̄: 0.25% x̃: 0.25%
HURT stats (abs)   min: 18 max: 216 x̄: 104.22 x̃: 98
HURT stats (rel)   min: 0.06% max: 0.73% x̄: 0.31% x̃: 0.11%
95% mean confidence interval for cycles value: -154.67 -35.22
95% mean confidence interval for cycles %-change: -0.15% <.01%
Inconclusive result (%-change mean confidence interval includes 0).

total spills in shared programs: 702 -> 703 (0.14%)
spills in affected programs: 702 -> 703 (0.14%)
helped: 0
HURT: 1

total fills in shared programs: 1497 -> 1499 (0.13%)
fills in affected programs: 1497 -> 1499 (0.13%)
helped: 0
HURT: 1

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Pick zero or non-zero result based on subtraction result

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 817327 -> 815717 (-0.20%)
instructions in affected programs: 755504 -> 753894 (-0.21%)
helped: 73
HURT: 1
helped stats (abs) min: 1 max: 159 x̄: 22.12 x̃: 14
helped stats (rel) min: 0.05% max: 0.40% x̄: 0.22% x̃: 0.23%
HURT stats (abs)   min: 5 max: 5 x̄: 5.00 x̃: 5
HURT stats (rel)   min: 0.07% max: 0.07% x̄: 0.07% x̃: 0.07%
95% mean confidence interval for instructions value: -27.27 -16.24
95% mean confidence interval for instructions %-change: -0.24% -0.20%
Instructions are helped.

total cycles in shared programs: 6822826 -> 6820707 (-0.03%)
cycles in affected programs: 6390844 -> 6388725 (-0.03%)
helped: 71
HURT: 3
helped stats (abs) min: 2 max: 537 x̄: 30.72 x̃: 18
helped stats (rel) min: <.01% max: 0.08% x̄: 0.03% x̃: 0.03%
HURT stats (abs)   min: 10 max: 32 x̄: 20.67 x̃: 20
HURT stats (rel)   min: 0.01% max: 0.02% x̄: 0.02% x̃: 0.02%
95% mean confidence interval for cycles value: -43.41 -13.86
95% mean confidence interval for cycles %-change: -0.04% -0.03%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Massively split the live range of zFrac0 and zFrac1

The main purpose of this commit is to prepare for "soft-fp64/fadd: Move
common code out of both branches of an if-statement".

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 822766 -> 817327 (-0.66%)
instructions in affected programs: 760943 -> 755504 (-0.71%)
helped: 74
HURT: 0
helped stats (abs) min: 8 max: 515 x̄: 73.50 x̃: 51
helped stats (rel) min: 0.58% max: 1.10% x̄: 0.77% x̃: 0.73%
95% mean confidence interval for instructions value: -91.17 -55.83
95% mean confidence interval for instructions %-change: -0.81% -0.74%
Instructions are helped.

total cycles in shared programs: 6816791 -> 6822826 (0.09%)
cycles in affected programs: 6384809 -> 6390844 (0.09%)
helped: 0
HURT: 74
HURT stats (abs) min: 6 max: 1179 x̄: 81.55 x̃: 50
HURT stats (rel) min: 0.02% max: 0.17% x̄: 0.09% x̃: 0.09%
95% mean confidence interval for cycles value: 48.99 114.12
95% mean confidence interval for cycles %-change: 0.09% 0.10%
Cycles are HURT.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fadd: Instead of tracking "b < a", track sign of the difference

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 824403 -> 822766 (-0.20%)
instructions in affected programs: 756260 -> 754623 (-0.22%)
helped: 68
HURT: 1
helped stats (abs) min: 1 max: 118 x̄: 26.26 x̃: 18
helped stats (rel) min: 0.02% max: 0.97% x̄: 0.31% x̃: 0.23%
HURT stats (abs) min: 149 max: 149 x̄: 149.00 x̃: 149
HURT stats (rel) min: 0.17% max: 0.17% x̄: 0.17% x̃: 0.17%
95% mean confidence interval for instructions value: -31.94 -15.51
95% mean confidence interval for instructions %-change: -0.37% -0.23%
Instructions are helped.

total cycles in shared programs: 6828935 -> 6816791 (-0.18%)
cycles in affected programs: 6385191 -> 6373047 (-0.19%)
helped: 73
HURT: 0
helped stats (abs) min: 2 max: 852 x̄: 166.36 x̃: 120
helped stats (rel) min: <.01% max: 0.80% x̄: 0.22% x̃: 0.17%
95% mean confidence interval for cycles value: -210.80 -121.91
95% mean confidence interval for cycles %-change: -0.27% -0.17%
Cycles are helped.

total fills in shared programs: 1442 -> 1497 (3.81%)
fills in affected programs: 1442 -> 1497 (3.81%)
helped: 0
HURT: 1

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Optimize __fmin64 and __fmax64 by using different evaluation order [v2]

v2: Go to extra effort to avoid flow control inserted to implement
short-circuit evaluation rules.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 797779 -> 796849 (-0.12%)
instructions in affected programs: 3499 -> 2569 (-26.58%)
helped: 21
HURT: 0
helped stats (abs) min: 8 max: 112 x̄: 44.29 x̃: 44
helped stats (rel) min: 16.09% max: 33.15% x̄: 25.72% x̃: 24.62%
95% mean confidence interval for instructions value: -55.94 -32.63
95% mean confidence interval for instructions %-change: -28.14% -23.30%
Instructions are helped.

total cycles in shared programs: 6601355 -> 6588351 (-0.20%)
cycles in affected programs: 25376 -> 12372 (-51.25%)
helped: 21
HURT: 0
helped stats (abs) min: 156 max: 1410 x̄: 619.24 x̃: 526
helped stats (rel) min: 42.39% max: 53.98% x̄: 50.12% x̃: 50.75%
95% mean confidence interval for cycles value: -776.58 -461.89
95% mean confidence interval for cycles %-change: -51.57% -48.67%
Cycles are helped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> [v1]
Reviewed-by: Matt Turner <mattst88@gmail.com> [v1]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/ffloor: Simplify the >= 0 comparison

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 797951 -> 797779 (-0.02%)
instructions in affected programs: 126482 -> 126310 (-0.14%)
helped: 15
HURT: 0
helped stats (abs) min: 1 max: 20 x̄: 11.47 x̃: 10
helped stats (rel) min: <.01% max: 0.60% x̄: 0.28% x̃: 0.29%
95% mean confidence interval for instructions value: -14.79 -8.14
95% mean confidence interval for instructions %-change: -0.40% -0.16%
Instructions are helped.

total cycles in shared programs: 6601437 -> 6601355 (<.01%)
cycles in affected programs: 1089336 -> 1089254 (<.01%)
helped: 15
HURT: 0
helped stats (abs) min: 2 max: 12 x̄: 5.47 x̃: 6
helped stats (rel) min: <.01% max: 0.04% x̄: 0.01% x̃: 0.01%
95% mean confidence interval for cycles value: -7.06 -3.87
95% mean confidence interval for cycles %-change: -0.02% <.01%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Relax the way NaN is propagated

Also reassociate a couple expressions to encourage some CSE.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 813599 -> 797951 (-1.92%)
instructions in affected programs: 796110 -> 780462 (-1.97%)
helped: 92
HURT: 0
helped stats (abs) min: 3 max: 5198 x̄: 170.09 x̃: 83
helped stats (rel) min: 0.36% max: 5.50% x̄: 1.57% x̃: 1.40%
95% mean confidence interval for instructions value: -282.42 -57.75
95% mean confidence interval for instructions %-change: -1.71% -1.42%
Instructions are helped.

total cycles in shared programs: 6687128 -> 6601437 (-1.28%)
cycles in affected programs: 6582246 -> 6496555 (-1.30%)
helped: 92
HURT: 0
helped stats (abs) min: 36 max: 14442 x̄: 931.42 x̃: 592
helped stats (rel) min: 0.45% max: 3.16% x̄: 1.44% x̃: 1.23%
95% mean confidence interval for cycles value: -1257.58 -605.27
95% mean confidence interval for cycles %-change: -1.58% -1.30%
Cycles are helped.

total spills in shared programs: 759 -> 702 (-7.51%)
spills in affected programs: 759 -> 702 (-7.51%)
helped: 3
HURT: 0

total fills in shared programs: 2412 -> 1442 (-40.22%)
fills in affected programs: 2412 -> 1442 (-40.22%)
helped: 3
HURT: 0

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fsat: Micro-optimize x >= 1 test

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 841590 -> 841332 (-0.03%)
instructions in affected programs: 121957 -> 121699 (-0.21%)
helped: 7
HURT: 0
helped stats (abs) min: 15 max: 54 x̄: 36.86 x̃: 41
helped stats (rel) min: 0.16% max: 0.33% x̄: 0.23% x̃: 0.18%
95% mean confidence interval for instructions value: -49.73 -23.98
95% mean confidence interval for instructions %-change: -0.29% -0.16%
Instructions are helped.

total cycles in shared programs: 6926828 -> 6923967 (-0.04%)
cycles in affected programs: 1038569 -> 1035708 (-0.28%)
helped: 7
HURT: 0
helped stats (abs) min: 128 max: 616 x̄: 408.71 x̃: 446
helped stats (rel) min: 0.18% max: 0.44% x̄: 0.29% x̃: 0.22%
95% mean confidence interval for cycles value: -571.72 -245.70
95% mean confidence interval for cycles %-change: -0.38% -0.19%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fsat: Micro-optimize x < 0 test

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 841647 -> 841590 (<.01%)
instructions in affected programs: 122014 -> 121957 (-0.05%)
helped: 7
HURT: 0
helped stats (abs) min: 3 max: 12 x̄: 8.14 x̃: 9
helped stats (rel) min: 0.04% max: 0.07% x̄: 0.05% x̃: 0.04%
95% mean confidence interval for instructions value: -11.23 -5.06
95% mean confidence interval for instructions %-change: -0.06% -0.03%
Instructions are helped.

total cycles in shared programs: 6926904 -> 6926828 (<.01%)
cycles in affected programs: 1038645 -> 1038569 (<.01%)
helped: 7
HURT: 0
helped stats (abs) min: 4 max: 16 x̄: 10.86 x̃: 12
helped stats (rel) min: <.01% max: 0.01% x̄: <.01% x̃: <.01%
95% mean confidence interval for cycles value: -14.97 -6.74
95% mean confidence interval for cycles %-change: -0.01% <.01%
Cycles are helped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fsat: Correctly handle NaN

fsat is defined as min(max(a, 0.0), 1.0), and IEEE defines both min and
max to return the non-NaN value when one value is NaN. Based on this,
fsat should definitely return 0.0 for NaN.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 841666 -> 841647 (<.01%)
instructions in affected programs: 122033 -> 122014 (-0.02%)
helped: 7
HURT: 0
helped stats (abs) min: 1 max: 4 x̄: 2.71 x̃: 3
helped stats (rel) min: 0.01% max: 0.02% x̄: 0.02% x̃: 0.01%
95% mean confidence interval for instructions value: -3.74 -1.69
95% mean confidence interval for instructions %-change: -0.02% -0.01%
Instructions are helped.

total cycles in shared programs: 6927246 -> 6926904 (<.01%)
cycles in affected programs: 1038987 -> 1038645 (-0.03%)
helped: 7
HURT: 0
helped stats (abs) min: 18 max: 72 x̄: 48.86 x̃: 54
helped stats (rel) min: 0.03% max: 0.05% x̄: 0.03% x̃: 0.03%
95% mean confidence interval for cycles value: -67.38 -30.33
95% mean confidence interval for cycles %-change: -0.05% -0.02%
Cycles are helped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Fixes: a42163cbbc1 ("compiler: Add lowering support for 64-bit saturate operations to software")
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2585
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/flt: Perform checks in a different order

The change to nir_opt_algebraic cleans up a pattern that was never
produced before the rest of this commit was added.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 843005 -> 841666 (-0.16%)
instructions in affected programs: 460655 -> 459316 (-0.29%)
helped: 64
HURT: 17
helped stats (abs) min: 1 max: 72 x̄: 21.72 x̃: 20
helped stats (rel) min: 0.01% max: 28.07% x̄: 12.67% x̃: 16.07%
HURT stats (abs)   min: 1 max: 7 x̄: 3.00 x̃: 2
HURT stats (rel)   min: 0.01% max: 0.04% x̄: 0.02% x̃: 0.02%
95% mean confidence interval for instructions value: -20.87 -12.19
95% mean confidence interval for instructions %-change: -12.35% -7.66%
Instructions are helped.

total cycles in shared programs: 6944998 -> 6927246 (-0.26%)
cycles in affected programs: 3891872 -> 3874120 (-0.46%)
helped: 71
HURT: 10
helped stats (abs) min: 2 max: 772 x̄: 254.21 x̃: 156
helped stats (rel) min: <.01% max: 66.44% x̄: 21.72% x̃: 18.40%
HURT stats (abs)   min: 18 max: 69 x̄: 29.70 x̃: 20
HURT stats (rel)   min: 0.02% max: 0.04% x̄: 0.03% x̃: 0.03%
95% mean confidence interval for cycles value: -270.82 -167.50
95% mean confidence interval for cycles %-change: -24.41% -13.65%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/fneg: Don't treat NaN specially

__fabs64 doesn't do anything special, and the value is still NaN
regardless of the value of the MSB.  In a strict sense, it's possible
that both functions should set the "signal" bit.

lts on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 844558 -> 843005 (-0.18%)
instructions in affected programs: 725975 -> 724422 (-0.21%)
helped: 53
HURT: 4
helped stats (abs) min: 1 max: 313 x̄: 29.87 x̃: 21
helped stats (rel) min: 0.01% max: 0.94% x̄: 0.30% x̃: 0.22%
HURT stats (abs)   min: 4 max: 11 x̄: 7.50 x̃: 7
HURT stats (rel)   min: 0.03% max: 0.09% x̄: 0.05% x̃: 0.04%
95% mean confidence interval for instructions value: -39.02 -15.47
95% mean confidence interval for instructions %-change: -0.34% -0.21%
Instructions are helped.

total cycles in shared programs: 6962024 -> 6944998 (-0.24%)
cycles in affected programs: 6185470 -> 6168444 (-0.28%)
helped: 59
HURT: 0
helped stats (abs) min: 64 max: 2863 x̄: 288.58 x̃: 208
helped stats (rel) min: 0.11% max: 0.87% x̄: 0.33% x̃: 0.27%
95% mean confidence interval for cycles value: -387.15 -190.00
95% mean confidence interval for cycles %-change: -0.38% -0.28%
Cycles are helped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Store sign value as 0 or 0x80000000

...instead of 0 or 1.  Many places the sign bit is extracted, then later
put back in the same position.  This saves some left-shift operations.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 848106 -> 844558 (-0.42%)
instructions in affected programs: 833480 -> 829932 (-0.43%)
helped: 106
HURT: 1
helped stats (abs) min: 1 max: 995 x̄: 33.48 x̃: 12
helped stats (rel) min: 0.15% max: 2.20% x̄: 0.60% x̃: 0.35%
HURT stats (abs)   min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel)   min: <.01% max: <.01% x̄: <.01% x̃: <.01%
95% mean confidence interval for instructions value: -51.88 -14.43
95% mean confidence interval for instructions %-change: -0.71% -0.47%
Instructions are helped.

total cycles in shared programs: 6969125 -> 6962024 (-0.10%)
cycles in affected programs: 6717689 -> 6710588 (-0.11%)
helped: 78
HURT: 7
helped stats (abs) min: 2 max: 2083 x̄: 110.27 x̃: 56
helped stats (rel) min: <.01% max: 0.30% x̄: 0.11% x̃: 0.11%
HURT stats (abs)   min: 2 max: 1340 x̄: 214.29 x̃: 4
HURT stats (rel)   min: 0.01% max: 0.71% x̄: 0.13% x̃: 0.02%
95% mean confidence interval for cycles value: -144.02 -23.06
95% mean confidence interval for cycles %-change: -0.12% -0.07%
Cycles are helped.

total spills in shared programs: 814 -> 759 (-6.76%)
spills in affected programs: 814 -> 759 (-6.76%)
helped: 2
HURT: 1

total fills in shared programs: 2488 -> 2412 (-3.05%)
fills in affected programs: 2488 -> 2412 (-3.05%)
helped: 2
HURT: 1

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Pick a single idiom for treating sign value as a Boolean

Replace all of the bool(qSign) with qSign != 0u. Remove unnecessary
parenthesis from around most of the existing qSign != 0u.

This dramatically simplifies the next commit.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 848109 -> 848106 (<.01%)
instructions in affected programs: 53 -> 50 (-5.66%)
helped: 1
HURT: 0

total cycles in shared programs: 6969145 -> 6969125 (<.01%)
cycles in affected programs: 396 -> 376 (-5.05%)
helped: 1
HURT: 0

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Simplify __countLeadingZeros32 function

findMSB returns -1 for an input of zero, so 31 - findMSB(a) is
sufficient on its own.

There's only one user of findMSB in shader-db, and it does not match
this pattern.

TODO: Add a pattern in the backend code generator that emits 31 -
nir_op_ufind_msb(a) as if it were nir_op_uclz. That should save a couple
instructions.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 859509 -> 848109 (-1.33%)
instructions in affected programs: 841058 -> 829658 (-1.36%)
helped: 97
HURT: 0
helped stats (abs) min: 3 max: 1161 x̄: 117.53 x̃: 72
helped stats (rel) min: 0.98% max: 6.74% x̄: 1.70% x̃: 1.35%
95% mean confidence interval for instructions value: -147.21 -87.84
95% mean confidence interval for instructions %-change: -1.94% -1.46%
Instructions are helped.

total cycles in shared programs: 7072275 -> 6969145 (-1.46%)
cycles in affected programs: 6955767 -> 6852637 (-1.48%)
helped: 97
HURT: 0
helped stats (abs) min: 32 max: 10900 x̄: 1063.20 x̃: 560
helped stats (rel) min: 1.18% max: 7.58% x̄: 1.84% x̃: 1.45%
95% mean confidence interval for cycles value: -1339.43 -786.96
95% mean confidence interval for cycles %-change: -2.11% -1.57%
Cycles are helped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64: Don't open-code umulExtended

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 928859 -> 859509 (-7.47%)
instructions in affected programs: 866293 -> 796943 (-8.01%)
helped: 76
HURT: 0
helped stats (abs) min: 75 max: 8042 x̄: 912.50 x̃: 688
helped stats (rel) min: 5.35% max: 21.02% x̄: 10.35% x̃: 7.58%
95% mean confidence interval for instructions value: -1138.37 -686.63
95% mean confidence interval for instructions %-change: -11.69% -9.00%
Instructions are helped.

total cycles in shared programs: 7272912 -> 7072275 (-2.76%)
cycles in affected programs: 6763486 -> 6562849 (-2.97%)
helped: 76
HURT: 0
helped stats (abs) min: 214 max: 30136 x̄: 2639.96 x̃: 1923
helped stats (rel) min: 1.75% max: 9.20% x̄: 4.04% x̃: 2.41%
95% mean confidence interval for cycles value: -3455.29 -1824.63
95% mean confidence interval for cycles %-change: -4.69% -3.39%
Cycles are helped.

total spills in shared programs: 817 -> 814 (-0.37%)
spills in affected programs: 791 -> 788 (-0.38%)
helped: 2
HURT: 0

total fills in shared programs: 2438 -> 2488 (2.05%)
fills in affected programs: 2392 -> 2442 (2.09%)
helped: 0
HURT: 2

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

soft-fp64/b2f: Reimplement using bitwise logic ops

This doesn't help a lot of shaders, but it helps those few a LOT.

This could also be implemented using bcsel. That version is very
slightly worse because the generated SEL instruction wants to have two
immediate sources, so one of them usually needs an extra MOV instruction
to load.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 929619 -> 928859 (-0.08%)
instructions in affected programs: 1651 -> 891 (-46.03%)
helped: 8
HURT: 0
helped stats (abs) min: 38 max: 152 x̄: 95.00 x̃: 95
helped stats (rel) min: 42.70% max: 86.36% x̄: 49.88% x̃: 44.66%
95% mean confidence interval for instructions value: -132.97 -57.03
95% mean confidence interval for instructions %-change: -62.28% -37.49%
Instructions are helped.

total cycles in shared programs: 7280180 -> 7272912 (-0.10%)
cycles in affected programs: 12960 -> 5692 (-56.08%)
helped: 8
HURT: 0
helped stats (abs) min: 352 max: 1456 x̄: 908.50 x̃: 910
helped stats (rel) min: 52.45% max: 91.19% x̄: 59.24% x̃: 55.15%
95% mean confidence interval for cycles value: -1274.03 -542.97
95% mean confidence interval for cycles %-change: -70.06% -48.41%
Cycles are helped.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

nir/algebraic: Simplify a contradiction that can occur in __flt64_nonnan

The pattern is added to opt_algebraic because, for example, comparisons
with constant 0.0 will produce (a1 < 0).

Even with a pass that optimized Boolean expressions, I think this would
be very difficult to automatically recognize and optimize.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 933054 -> 929619 (-0.37%)
instructions in affected programs: 784041 -> 780606 (-0.44%)
helped: 59
HURT: 0
helped stats (abs) min: 2 max: 213 x̄: 58.22 x̃: 44
helped stats (rel) min: 0.02% max: 2.51% x̄: 0.72% x̃: 0.46%
95% mean confidence interval for instructions value: -70.80 -45.64
95% mean confidence interval for instructions %-change: -0.92% -0.53%
Instructions are helped.

total cycles in shared programs: 7304712 -> 7280180 (-0.34%)
cycles in affected programs: 7176260 -> 7151728 (-0.34%)
helped: 92
HURT: 0
helped stats (abs) min: 8 max: 1414 x̄: 266.65 x̃: 166
helped stats (rel) min: 0.04% max: 2.34% x̄: 0.43% x̃: 0.22%
95% mean confidence interval for cycles value: -333.05 -200.26
95% mean confidence interval for cycles %-change: -0.54% -0.31%
Cycles are helped.

Regular shader-db changes:

No changes on any Intel platform.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

nir/algebraic: Constant reassociation for bitwise operations too

Like 5886cd79a0e, but for iand, ior, and ixor.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake
total instructions in shared programs: 903108 -> 902830 (-0.03%)
instructions in affected programs: 654910 -> 654632 (-0.04%)
helped: 31
HURT: 5
helped stats (abs) min: 2 max: 31 x̄: 9.58 x̃: 7
helped stats (rel) min: 0.01% max: 0.23% x̄: 0.06% x̃: 0.04%
HURT stats (abs)   min: 1 max: 10 x̄: 3.80 x̃: 3
HURT stats (rel)   min: 0.01% max: 0.10% x̄: 0.03% x̃: 0.02%
95% mean confidence interval for instructions value: -10.55 -4.89
95% mean confidence interval for instructions %-change: -0.07% -0.03%
Instructions are helped.

total cycles in shared programs: 7059681 -> 7058006 (-0.02%)
cycles in affected programs: 5081309 -> 5079634 (-0.03%)
helped: 33
HURT: 12
helped stats (abs) min: 1 max: 444 x̄: 60.91 x̃: 18
helped stats (rel) min: <.01% max: 2.17% x̄: 0.25% x̃: 0.05%
HURT stats (abs)   min: 1 max: 288 x̄: 27.92 x̃: 2
HURT stats (rel)   min: <.01% max: 1.00% x̄: 0.23% x̃: 0.02%
95% mean confidence interval for cycles value: -68.32 -6.12
95% mean confidence interval for cycles %-change: -0.28% 0.03%
Inconclusive result (%-change mean confidence interval includes 0).

Ice Lake
total instructions in shared programs: 895384 -> 895159 (-0.03%)
instructions in affected programs: 658678 -> 658453 (-0.03%)
helped: 37
HURT: 0
helped stats (abs) min: 3 max: 16 x̄: 6.08 x̃: 4
helped stats (rel) min: <.01% max: 0.07% x̄: 0.04% x̃: 0.04%
95% mean confidence interval for instructions value: -7.46 -4.70
95% mean confidence interval for instructions %-change: -0.04% -0.03%
Instructions are helped.

total cycles in shared programs: 7092224 -> 7091195 (-0.01%)
cycles in affected programs: 5221666 -> 5220637 (-0.02%)
helped: 35
HURT: 11
helped stats (abs) min: 1 max: 247 x̄: 43.46 x̃: 12
helped stats (rel) min: <.01% max: 2.17% x̄: 0.23% x̃: 0.05%
HURT stats (abs)   min: 2 max: 432 x̄: 44.73 x̃: 5
HURT stats (rel)   min: <.01% max: 1.00% x̄: 0.25% x̃: 0.02%
95% mean confidence interval for cycles value: -49.00 4.26
95% mean confidence interval for cycles %-change: -0.27% 0.03%
Inconclusive result (value mean confidence interval includes 0).

Regular shader-db results:

All Haswell+ platforms had similar results. (Tiger Lake shown)
total instructions in shared programs: 17611408 -> 17611398 (<.01%)
instructions in affected programs: 1648 -> 1638 (-0.61%)
helped: 2
HURT: 0

total cycles in shared programs: 338366148 -> 338366124 (<.01%)
cycles in affected programs: 124048 -> 124024 (-0.02%)
helped: 2
HURT: 0

No changes on any earlier Intel platforms.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

nir/algebraic: Generalize some and-of-shift-right patterns [v2]

Generalizes some of the patterns from 76289fbfa84a and 905ff8619824.  In
particular, some of the soft-fp64 code generates (a & 0x7fffffff) << 1
when constant 0.0 is compared (flt or feq).

v2: Reduce the set of added patterns to those that actually help
something.  This reduces the size of the state transition tables by
about 29k.  Suggested by Jason.  Remove the existing patterns that this
commit subsumes.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake
total instructions in shared programs: 903171 -> 903108 (<.01%)
instructions in affected programs: 635903 -> 635840 (<.01%)
helped: 25
HURT: 11
helped stats (abs) min: 1 max: 16 x̄: 5.04 x̃: 3
helped stats (rel) min: <.01% max: 0.15% x̄: 0.04% x̃: 0.03%
HURT stats (abs)   min: 2 max: 14 x̄: 5.73 x̃: 5
HURT stats (rel)   min: <.01% max: 0.11% x̄: 0.04% x̃: 0.02%
95% mean confidence interval for instructions value: -3.91 0.41
95% mean confidence interval for instructions %-change: -0.03% <.01%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 7059527 -> 7059681 (<.01%)
cycles in affected programs: 5249401 -> 5249555 (<.01%)
helped: 41
HURT: 9
helped stats (abs) min: 2 max: 76 x̄: 11.90 x̃: 10
helped stats (rel) min: <.01% max: 11.86% x̄: 0.99% x̃: 0.01%
HURT stats (abs)   min: 2 max: 380 x̄: 71.33 x̃: 12
HURT stats (rel)   min: <.01% max: 0.22% x̄: 0.04% x̃: 0.01%
95% mean confidence interval for cycles value: -14.93 21.09
95% mean confidence interval for cycles %-change: -1.40% -0.20%
Inconclusive result (value mean confidence interval includes 0).

Ice Lake
total instructions in shared programs: 895506 -> 895384 (-0.01%)
instructions in affected programs: 658800 -> 658678 (-0.02%)
helped: 37
HURT: 0
helped stats (abs) min: 2 max: 8 x̄: 3.30 x̃: 2
helped stats (rel) min: <.01% max: 0.03% x̄: 0.02% x̃: 0.02%
95% mean confidence interval for instructions value: -4.00 -2.59
95% mean confidence interval for instructions %-change: -0.02% -0.02%
Instructions are helped.

total cycles in shared programs: 7092748 -> 7092224 (<.01%)
cycles in affected programs: 5272008 -> 5271484 (<.01%)
helped: 36
HURT: 14
helped stats (abs) min: 2 max: 440 x̄: 21.67 x̃: 8
helped stats (rel) min: <.01% max: 11.86% x̄: 1.12% x̃: 0.02%
HURT stats (abs)   min: 2 max: 122 x̄: 18.29 x̃: 6
HURT stats (rel)   min: <.01% max: 0.07% x̄: 0.01% x̃: <.01%
95% mean confidence interval for cycles value: -29.24 8.28
95% mean confidence interval for cycles %-change: -1.40% -0.21%
Inconclusive result (value mean confidence interval includes 0).

Regular shader-db results:

All Haswell+ platforms had similar results. (Tiger Lake shown)
total instructions in shared programs: 17611489 -> 17611408 (<.01%)
instructions in affected programs: 21188 -> 21107 (-0.38%)
helped: 23
HURT: 1
helped stats (abs) min: 1 max: 16 x̄: 3.78 x̃: 3
helped stats (rel) min: 0.03% max: 5.82% x̄: 1.13% x̃: 0.85%
HURT stats (abs)   min: 6 max: 6 x̄: 6.00 x̃: 6
HURT stats (rel)   min: 0.60% max: 0.60% x̄: 0.60% x̃: 0.60%
95% mean confidence interval for instructions value: -5.27 -1.48
95% mean confidence interval for instructions %-change: -1.70% -0.42%
Instructions are helped.

total cycles in shared programs: 338418502 -> 338366148 (-0.02%)
cycles in affected programs: 2289052 -> 2236698 (-2.29%)
helped: 18
HURT: 3
helped stats (abs) min: 4 max: 18000 x̄: 2909.67 x̃: 38
helped stats (rel) min: 0.09% max: 4.07% x̄: 0.96% x̃: 0.43%
HURT stats (abs)   min: 2 max: 14 x̄: 6.67 x̃: 4
HURT stats (rel)   min: 0.22% max: 1.13% x̄: 0.66% x̃: 0.64%
95% mean confidence interval for cycles value: -5204.00 217.91
95% mean confidence interval for cycles %-change: -1.31% -0.14%
Inconclusive result (value mean confidence interval includes 0).

Ivy Bridge
total instructions in shared programs: 11875617 -> 11875615 (<.01%)
instructions in affected programs: 1339 -> 1337 (-0.15%)
helped: 2
HURT: 0

No changes on any earlier Intel platforms.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com> [v1]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

nir/algebraic: optimize ior(ine(a, 0), ine(b, 0)) to ine(ior(a, b), 0)

Like 70f9e2589e6b.  Also scrub the unnecessary size qualifier in both
replacement patterns.

This occurs in a handful of places in the soft-fp64 code, and that is
the primary reason for the change.

Perhaps the patterns that generate umin should be conditioned on
something, but I'm not sure what.  lower_bitops might cover the cases
that matter, but it seems ugly.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 936505 -> 933388 (-0.33%)
instructions in affected programs: 925719 -> 922602 (-0.34%)
helped: 154
HURT: 1
helped stats (abs) min: 1 max: 211 x̄: 35.45 x̃: 16
helped stats (rel) min: 0.34% max: 9.30% x̄: 2.28% x̃: 0.96%
HURT stats (abs)   min: 2342 max: 2342 x̄: 2342.00 x̃: 2342
HURT stats (rel)   min: 2.28% max: 2.28% x̄: 2.28% x̃: 2.28%
95% mean confidence interval for instructions value: -51.21 10.99
95% mean confidence interval for instructions %-change: -2.61% -1.89%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 7323502 -> 7306184 (-0.24%)
cycles in affected programs: 7220376 -> 7203058 (-0.24%)
helped: 126
HURT: 1
helped stats (abs) min: 2 max: 946 x̄: 159.10 x̃: 95
helped stats (rel) min: 0.01% max: 9.62% x̄: 0.80% x̃: 0.37%
HURT stats (abs)   min: 2728 max: 2728 x̄: 2728.00 x̃: 2728
HURT stats (rel)   min: 0.37% max: 0.37% x̄: 0.37% x̃: 0.37%
95% mean confidence interval for cycles value: -192.07 -80.66
95% mean confidence interval for cycles %-change: -1.07% -0.51%
Cycles are helped.

total spills in shared programs: 635 -> 817 (28.66%)
spills in affected programs: 635 -> 817 (28.66%)
helped: 0
HURT: 3

total fills in shared programs: 2065 -> 2438 (18.06%)
fills in affected programs: 2019 -> 2392 (18.47%)
helped: 0
HURT: 2

Regular shader-db results:

All Haswell+ platforms had similar results. (Tiger Lake shown)
total instructions in shared programs: 17611506 -> 17611489 (<.01%)
instructions in affected programs: 33442 -> 33425 (-0.05%)
helped: 32
HURT: 6
helped stats (abs) min: 1 max: 6 x̄: 1.69 x̃: 1
helped stats (rel) min: 0.08% max: 1.90% x̄: 0.27% x̃: 0.11%
HURT stats (abs)   min: 1 max: 15 x̄: 6.17 x̃: 5
HURT stats (rel)   min: 0.09% max: 1.50% x̄: 0.65% x̃: 0.55%
95% mean confidence interval for instructions value: -1.70 0.80
95% mean confidence interval for instructions %-change: -0.30% 0.05%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 338419218 -> 338418502 (<.01%)
cycles in affected programs: 385795 -> 385079 (-0.19%)
helped: 42
HURT: 3
helped stats (abs) min: 2 max: 192 x̄: 24.57 x̃: 16
helped stats (rel) min: 0.04% max: 2.09% x̄: 0.33% x̃: 0.22%
HURT stats (abs)   min: 64 max: 164 x̄: 105.33 x̃: 88
HURT stats (rel)   min: 0.77% max: 1.58% x̄: 1.09% x̃: 0.93%
95% mean confidence interval for cycles value: -29.76 -2.06
95% mean confidence interval for cycles %-change: -0.40% -0.07%
Cycles are helped.

Ivy Bridge and Sandy Bridge had similar results. (Ivy Bridge shown)
total instructions in shared programs: 11875620 -> 11875617 (<.01%)
instructions in affected programs: 421 -> 418 (-0.71%)
helped: 2
HURT: 0

total cycles in shared programs: 178245336 -> 178245326 (<.01%)
cycles in affected programs: 3425 -> 3415 (-0.29%)
helped: 2
HURT: 0

No changes on Gen4 or Gen5.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

nir/algebraic: Simplify logic to detect sign of an integer

This occurs in a handful of places in the soft-fp64 code, and that is
the primary reason for the change.

v2: Fix a typo in a comment.  Noticed by Matt.  Copy the correct fp64
shader-db results to the commit message.  I realized that I used
accidentally used the results from the next commit.

Results on the 308 shaders extracted from the fp64 portion of the OpenGL
CTS:

Tiger Lake and Ice Lake had similar results. (Tiger Lake shown)
total instructions in shared programs: 906235 -> 906149 (<.01%)
instructions in affected programs: 353966 -> 353880 (-0.02%)
helped: 31
HURT: 2
helped stats (abs) min: 1 max: 8 x̄: 3.03 x̃: 3
helped stats (rel) min: 0.01% max: 1.59% x̄: 0.10% x̃: 0.04%
HURT stats (abs)   min: 3 max: 5 x̄: 4.00 x̃: 4
HURT stats (rel)   min: 0.02% max: 0.02% x̄: 0.02% x̃: 0.02%
95% mean confidence interval for instructions value: -3.51 -1.70
95% mean confidence interval for instructions %-change: -0.19% <.01%
Inconclusive result (%-change mean confidence interval includes 0).

total cycles in shared programs: 7076552 -> 7076173 (<.01%)
cycles in affected programs: 2878361 -> 2877982 (-0.01%)
helped: 37
HURT: 2
helped stats (abs) min: 2 max: 48 x̄: 10.81 x̃: 6
helped stats (rel) min: <.01% max: 2.17% x̄: 0.47% x̃: 0.01%
HURT stats (abs)   min: 1 max: 20 x̄: 10.50 x̃: 10
HURT stats (rel)   min: <.01% max: 0.01% x̄: <.01% x̃: <.01%
95% mean confidence interval for cycles value: -13.96 -5.48
95% mean confidence interval for cycles %-change: -0.72% -0.16%
Cycles are helped.

total fills in shared programs: 2064 -> 2065 (0.05%)
fills in affected programs: 45 -> 46 (2.22%)
helped: 0
HURT: 1

Regular shader-db results:

All Gen7+ platforms had similar results. (Tiger Lake shown)
total instructions in shared programs: 17611530 -> 17611506 (<.01%)
instructions in affected programs: 5934 -> 5910 (-0.40%)
helped: 10
HURT: 0
helped stats (abs) min: 1 max: 5 x̄: 2.40 x̃: 2
helped stats (rel) min: 0.14% max: 1.24% x̄: 0.47% x̃: 0.34%
95% mean confidence interval for instructions value: -3.53 -1.27
95% mean confidence interval for instructions %-change: -0.78% -0.17%
Instructions are helped.

total cycles in shared programs: 338419178 -> 338419218 (<.01%)
cycles in affected programs: 19244 -> 19284 (0.21%)
helped: 4
HURT: 2
helped stats (abs) min: 2 max: 4 x̄: 3.00 x̃: 3
helped stats (rel) min: 0.05% max: 0.11% x̄: 0.08% x̃: 0.08%
HURT stats (abs)   min: 26 max: 26 x̄: 26.00 x̃: 26
HURT stats (rel)   min: 1.20% max: 1.20% x̄: 1.20% x̃: 1.20%
95% mean confidence interval for cycles value: -9.08 22.41
95% mean confidence interval for cycles %-change: -0.35% 1.04%
Inconclusive result (value mean confidence interval includes 0).

No changes on any earlier Intel platform.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142>

st/mesa: disallow deferred flush if there are multiple contexts

u_threaded can hang in these situation, with one context waiting on a
deferred fence from the other context.
But the other context isn't flushing its pending work (because it's waiting
for more work to pushed) so everything is stuck.

Fixes: d17b35e671a ("gallium: add PIPE_FLUSH_DEFERRED")
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/1430
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4213>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4213>

anv: Use isl_drm_modifier_get_default_aux_state()

Use it in anv_layout_to_aux_state().

Refactor only. No change in behavior.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3881>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3881>

intel/isl: Don't align linear images to 64K on Gen12+

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4048>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4048>

radv: fix random depth range unrestricted failures due to a cache issue

The shader module name is used to compute the pipeline key. The
driver used to load the wrong pipelines because the shader names
were similar.

This should fix random failures of
dEQP-VK.pipeline.depth_range_unrestricted.*

Fixes: f11ea226664 ("radv: fix a performance regression with graphics depth/stencil clears")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4216>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4216>

turnip: Do gathering xfb info after nir_remove_dead_variables

So we could align stream outputs correctly even if unused in/outs are
removed.

Fixes:
dEQP-VK.transform_feedback.fuzz.random_vertex.scalar_types.*
dEQP-VK.transform_feedback.fuzz.random_vertex.vector_types.*

Signed-off-by: Hyunjun Ko <zzoon@igalia.com>
Reviewed-by: Jonathan Marek <jonathan@marek.ca>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4207>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4207>

turnip: Fix wrong assignment of xfb output's offset.

Should be divided by 4 so we could calculate the offset correctly in
tu6_setup_streamout.

Fixes: 2a1d6b81ed54971d33e83b7f5545da096b13b043
Related: 374406a7c420d266f920461f904864a94dc1b8c8

Signed-off-by: Hyunjun Ko <zzoon@igalia.com>
Reviewed-by: Jonathan Marek <jonathan@marek.ca>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4207>

intel/decoder: don't consider header fields past dword0

v2: use ULL

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4134>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4134>

lima: decode depth/stencil write bits in RSW

Now that we know the bits that are responsible for enabling depth/stencil
writes in shader we can decode them properly.

Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4197>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4197>

lima: implement zsbuf reload

Fragment shader can write depth and stencil if we set necessary flags
in RSW. In addition to that we need to use special format for Z24S8.
Original format is apparently Z24X8 since we can't sample stencil in GLES2.
This new format also seems to use several components for storing depth
since we saw r != g != b when sampling with this format.

[vasily: - initialize clear->depth to 0xffffff if we reload depth, just
like blob does. Reloading doesn't work otherwise
- use single bitmap for reload type]

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4197>

lima: disable Z16 format

Unfortunately we don't know how to reload Z16 buffers yet and blob
is using Z24 for dEQP tests that need depth reload.

Reviewed-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4197>

gallium/util: Switch util_float_to_half to _mesa_float_to_half()'s impl.

The util_float_to_half() implementation was much smaller, but when trying
to switch _mesa_float_to_half to it, many testcases
(dEQP-VK.spirv_assembly.instruction.graphics.opquantize.*,
piglit.spec.arb_shading_language_packing.*packhalf2x16) start failing on
Intel. Replace the broken impl so that people don't have to debug it
later.

Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3699>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3699>

amd/llvm: Fix divergent descriptor regressions with radeonsi.

piglit/bin/arb_bindless_texture-limit -auto -fbo:
Needed to deal with non-NULL dynamic_index without deref in tex instructions.

piglit/bin/shader_runner tests/spec/arb_bindless_texture/execution/images/multiple-resident-images-reading.shader_test -auto:
Need to deal with non-deref images in enter_waterfall_imae.

Fixes: b83c9aca4a5 "amd/llvm: Fix divergent descriptor indexing. (v3)"
Acked-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4191>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4191>

gallium: fix build with latest meson and gcc10

In Fedora 32 build was failing with meson-0.53.2-1.git88e40c7.fc32
and gcc-10.0.1-0.9.fc32.x86_64.

Worked with meson-0.53.1-1 and same gcc.

/usr/bin/ld: src/gallium/state_trackers/dri/libdri.a(dri2.c.o): in function `dri2_interop_export_object':
/home/airlied/devel/mesa/mesa/build/../src/gallium/state_trackers/dri/dri2.c:1813: undefined reference to `st_finalize_texture'
/usr/bin/ld: src/gallium/state_trackers/dri/libdri.a(dri_screen.c.o): in function `dri_init_screen_helper':
/home/airlied/devel/mesa/mesa/build/../src/gallium/state_trackers/dri/dri_screen.c:580: undefined reference to `st_gl_api_create'

Moving this around seems to fix it.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4220>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4220>

ac: don't set old denormals flags with LLVM >= 11

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4196>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4196>

ac: set new LLVM denormal flags

See: https://reviews.llvm.org/D71358

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4196>

ac: unify denorm setting enforcement

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4196>

gallium/u_vbuf: simplify the first if statement in u_vbuf_upload_buffers

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4153>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4153>

gallium/u_threaded: don't sync the thread for all unsychronized mappings

This was missing for the READ case. This improves glBegin/End performance.
(vbo maps with WRITE | READ | UNSYCHRONIZED)

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4153>

freedreno/a5xx: Fix min-vs-mag filtering decisions on non-mipmap tex.

This a port of 3338d6e5f8b5 ("freedreno/a3xx: Mostly fix min-vs-mag
filtering decisions on non-mipmap tex.")

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4177>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4177>

ci: Enable testing GLES2-3 on a530 (Dragonboard 820c).

Following on from the db410c conversion to baremetal testing, reuse the
same scripts in the same rack to run 7 db820c boards (#4/8 is failing in
the bootloader for unknown reasons).

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4177>

ci: Enable ccaching of CMake builds as well.

They ignore $PATH for unknown reasons, so you have to force the ccache
wrapping yourself.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4099>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4099>

ci: Enable ccache in the container builds.

This should reduce our container rebuild times, particularly on the
40-minute ARM build (which is split across only 2 runners and thus likely
to have a hot cache) when working on updating containers.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4099>

ci: Update the ci-templates commit.

There has been a big rename of variables in the upstream repo to make it
clear what's being handed to ci-templates.

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4099>

anv: Do an end-of-pipe sync before updating AUX table entries

We've found in GL that an actual end-of-pipe sync is required before
invalidating the aux tables and that a simple CS stall is insufficient.
If we're about to modify the actual AUX table entries from the GPU, we
should definitely make sure it's stopped dead before we do so.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4206>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4206>

intel/blorp: Plumb the stage through blorp upload_shader

Vulkan uses that for its own upload function -- even though for BLORP
it doesn't really currently care. Neither Iris and i965 makes use of
it at the moment.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4170>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4170>

zink: zero out zink_render_pass_state

Since zink_render_pass_state is used as a hash-key, the entire struct gets
compared. This means we don't want any uninitialized padding in there, or
else we risk getting false negatives. This has led to issues on macOS builds.

So let's zero out the struct before we start filling it out.

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4212>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4212>

radv/gfx10: fix required ballot size with VK_EXT_subgroup_size_control

If compute shaders require a specific subgroup size (ie. Wave32),
we have to use the correct ballot size.

Fixes dEQP-VK.subgroups.ballot_other.compute.*_requiredsubgroupSize.

Fixes: fb07fd4e6cb ("radv: implement VK_EXT_subgroup_size_control")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4215>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4215>

radv/gfx10: fix required subgroup size with VK_EXT_subgroup_size_control

If compute shaders require a specific subgroup size (ie. Wave32),
we have to return the correct one.

Fixes dEQP-VK.subgroups.size_control.compute.required_subgroup_size_*.

Fixes: fb07fd4e6cb ("radv: implement VK_EXT_subgroup_size_control")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4215>

radv: only inject implicit subpass dependencies if necessary

The Vulkan 1.2.134 spec update clarified when implicit subpass
dependencies should be injected by the driver. They only make
sense if automatic layout transitions are performed.

This should fix a performance regression with RPCS3 (although
they added a workaround for RADV since the regression has been found).

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2502
Fixes: e60de085473 ("radv: handle missing implicit subpass dependencies")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4210>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4210>

gitlab-ci: Enable more Gallium drivers in meson-i386 job

These are the ones which can be enabled with the current x86_build
docker image and which build without warnings.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4166>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4166>

llvmpipe: Use uintptr_t for pointer values

Instead of uint64_t. Fixes potentially writing beyond the end of the
handles pointer array on 32-bit architectures (and copying all 0s
instead of the computed pointer values to the array on big endian
ones).

Corresponding compiler warning:

../src/gallium/drivers/llvmpipe/lp_state_cs.c: In function ‘llvmpipe_set_global_binding’:
../src/gallium/drivers/llvmpipe/lp_state_cs.c:1312:12: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
1312 |       va = (uint64_t)((char *)lp_res->data + offset);
      |            ^

Fixes: 264663d55d32 "gallivm/llvmpipe: add support for global
                     operations."

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4166>

gitlab-ci: Move classic driver testing to a new meson-classic job

The motivation is to allow llvmpipe to be enabled instead in the
meson-i386 job.

v2: (Eric Engestrom)
* Rename meson-main job to meson-gallium
* Remove stale comment above meson-i386 job

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4166>

gitlab-ci: Fold scons-swr job into scons job

Should be fast enough.

Acked-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4166>

tu: Fix border color with compute shaders

I wasn't able to find any CTS tests that used compute shaders with
samplers and set a border color, so I hacked one of the tests included
with amber:

https://gist.github.com/cwabbott0/e72f0ed8259b84ed6bf3920c68fefee6

The register was found via looking at dumps of the Vulkan blob, and
setting it fixes this test.

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4204>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4204>

gitlab-ci: Don't use buster-backports packages by default for x86_build

The backports repository can be temporarily inconsistent between
architectures, which can break the docker image build.

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4209>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4209>

ci: Drop the git dependency in tracie

Instead of using git, use python and the Gitlab API
to fetch traces. This helps us slim down our ramdisks
in preparation for integrating trace replay on LAVA
devices.

Signed-off-by: Rohan Garg <rohan.garg@collabora.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4000>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4000>

gitlab-ci: Use surfaceless platform also for apitrace

In preparation for using apitrace to replay traces in LAVA jobs, build a
newer waffle so apitrace can use the surfaceless EGL platform.

As things were before this commit, Xvfb would have been needed in the
LAVA images.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4000>

gitlab-ci: Update renderdoc

Get closer to upstream to avoid accumulating changes.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4000>

lima/gpir: fix crash in schedule_insert_ready_list()

Fix crash if node is already at position we want. Otherwise we remove
it from list (and list->prev becomes NULL) and then we dereference list->prev
in list_addtail()

Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4126>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4126>

lima/gpir: add better lowering for ftrunc

GP doesn't support ftrunc natively and unfortunately one in generic
opt_algebraic is not GP-friendly either. Introduce our own lowering
that utilizes fsign() that GP supports:
ftrunc(a) = fmul(fsign(a), ffloor(fmax(a, -a)))

Tested-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4126>

lima/gpir: kill dead writes to regs in DCE

Writes to regs that are never read will confuse regalloc since they
are never live and don't conflict with any regs. Kill them to prevent
overwriting another live reg.

Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>

lima/gpir: Optimize nots created from branch lowering

We also add a DCE pass to cleanup the result of this pass, which turns
out to also be necessary to cleanup the result of nir->gpir in some
cases that we didn't hit until the next commit.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>

lima/gpir: Optimize conditional break/continue

Optimize the result of a conditional break/continue. In NIR something
like:

loop {
   ...
   if (cond)
      continue;

would get lowered to:

block_0:
...
block_1:
branch_cond !cond block_3
block_2:
branch_uncond block_0
block_3:
...

We recognize the conditional branch skipping over the unconditional
branch, and turn it into:

block_0:
...
block_1:
branch_cond cond block_0
block_2:
block_3:

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>

lima/gpir: Make lima_gpir_node_insert_child() useful

We weren't using this function before. The name is confusing, but it
changes the child while also fixing up the dependence link, if you don't
have access to it already. Or at least, I think that's what the
intention is, and what we'll need to change the branch condition in the
next commit. Adding a dependency between the new and old source doesn't
make any sense for this, and we also need to change the actual source.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>

panfrost: Fix gnu-empty-initializer error.

../src/gallium/drivers/panfrost/pan_cmdstream.c:1553:54: error: use of GNU empty initializer extension [-Werror,-Wgnu-empty-initializer]
union mali_attr varyings[PIPE_MAX_ATTRIBS] = { };
^

Fixes: 836686daf36c ("panfrost: Move panfrost_emit_varying_descriptor() to pan_cmdstream.c")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4198>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4198>

aco: fix operand order for LS VGPR init bug workaround

Fixes: a952bf3946 ('aco: Fix LS VGPR init bug on affected hardware.')
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-By: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4201>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4201>

aco: fix instruction encoding for LS VGPR init bug workaround

Fixes: a952bf3946 ('aco: Fix LS VGPR init bug on affected hardware.')
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-By: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4201>

aco: set late kill for v_interp_p1_f32 for some APUs

Apparently needed for Stoney Ridge, Kabini and Mullins APUs.

gfx702 also has 16-bank LDS and https://llvm.org/docs/AMDGPUUsage.html
lists some dGPUs under there. Those GPUs seem to be Hawaii actually
(gfx701) and we don't seem to have gotten any interpolation related bugs
reported with them so far.

The late kill flag was tested by running pipeline-db with
ACO_DEBUG=validatera while setting late kill for SMEM buffer loads,
emit_vop2_instruction() and texture instructions. I also tested with
just setting the flag for v_interp_p1_f32.

As far as I know, the only other thing we have to consider for 16-bank LDS
is something to do with 16-bit interpolation. We don't do that yet.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3914>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3914>

aco: add a late kill flag

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3914>

aco: move some register demand helpers into aco_live_var_analysis.cpp

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3914>

radv/sqtt: handle thread trace capture in sqtt_QueuePresentKHR()

To avoid wasting CPU cycles when thread trace is not enabled.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4180>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4180>

anv: Push UBO ranges relative to the start of the binding

There was a disconnect between anv_nir_compute_push_layout and the code
which sets up the push_ubo_sizes array.  The NIR code we emit checks
relative to the start of the bound UBO range so that, if we end up with
a vector which straddles the start of the push range, we can perform the
bounds check without risking overflow issues.  The code which sets up
the push_ubo_sizes, on the other hand, assumed it was relative to the
start of the push range.  Somehow, this didn't get get caught by any of
the available tests.

Fixes: e03f9652801 "anv: Bounds-check pushed UBOs when ..."
Closes: #2623
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4195>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4195>

anv: Fix the comparison in an assert

Fixes: e03f9652801 "anv: Bounds-check pushed UBOs when ..."
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4195>

gitlab-ci: bump Vulkan CTS to 1.2.1.0

Vulkan CTS 1.1.6.0 is quite old.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4179>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4179>

gitlab-ci: do not set the number of deqp-parallel jobs for RADV CTS

Let's the runner uses the maximum number of jobs to speedup CTS.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4179>

gitlab-ci: allow deqp-runner to use the maximum number of jobs

if $DEQP_PARALLEL is not set, it will use the maximum number of
jobs instead of 1.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4179>

gitlab-ci: remove useless 'patch' package in the VK test image

It was copied from the GL test image but it's actually unused.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4179>

tu: Rewrite border color handling

Emit a single table of all possible Vulkan border colors up front, and
then index into it using the Vulkan enum directly. In fact this seems to
be the entire point of separating out border colors in the first place.

In addition to being simpler and having less CPU overhead, and fixing
cases where more than one sampler uses border color, this paves the way
for bindless samplers because the existing approach isn't great for
bindless.

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4200>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4200>

meson: Avoid duplicate symbols.

All the stubs in src/compiler/glsl/glcpp/pp_standalone_scaffolding.c
are duplicate symbols. They should only be used as replacement for
Mesa functions when building glcpp and glsl standalone compilers, but
in fact they are getting linked with Mesa.

This change fixes this by moving the standalone stubs to a
libglcpp_standalone target, that's only linked with the glcpp/glsl
tools.

Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Neha Bhende <bhenden@vmware.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4186>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4186>

Revert "ci: Remove T820 from CI temporarily"

This reverts commit 089c8f0b8da86a05bde8359c84085e0b795abf17.

Our office changes are finished and power is now stable in our lab
for T820 CI to run again.

Cc: Daniel Stone <daniels@collabora.com>
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4057>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4057>