The main motivation is to enable HDC surface opcodes on ICL which no
longer allows the sample mask to be provided in a message header, but
this is enabled all the way back to IVB when possible because it
decreases the instruction count of some shaders using HDC messages
significantly, e.g. one of the SynMark2 CSDof compute shaders
decreases instruction count by about 40% due to the removal of header
setup boilerplate which in turn makes a number of send message
payloads more easily CSE-able. Shader-db results on SKL:
total instructions in shared programs: 15325319 -> 15314384 (-0.07%)
instructions in affected programs: 311532 -> 300597 (-3.51%)
helped: 491
HURT: 1
Shader-db results on BDW where the optimization needs to be disabled
in some cases due to hardware restrictions:
total instructions in shared programs: 15604794 -> 15598028 (-0.04%)
instructions in affected programs: 220863 -> 214097 (-3.06%)
helped: 351
HURT: 0
The FPS of SynMark2 CSDof improves by 5.09% ±0.36% (n=10) on my SKL
laptop with this change. According to Eero this improves performance
of the same test by 9% on BYT and by 7-8% on BXT J4205 and on SKL GT2
desktop.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Tested-By: Eero Tamminen <eero.t.tamminen@intel.com>
This shouldn't cause any functional change at this point, it changes
SHADER_OPCODE_FIND_LIVE_CHANNEL to use the flag register specified at
the IR level instead of the hard-coded f1.0, now that it can be
represented in backend_instruction::flag_subreg. This will be
necessary for scheduling to behave correctly once more things start
making use of f1.0.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This allows representing conditional mods and predicates on f1.0-f1.1
at the IR level by adding an extra bit to the flag_subreg
backend_instruction field.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This gives the scheduler visibility into the headers which should
improve scheduling. More importantly, however, it lets the scheduler
know that the header gets written. As-is, the scheduler thinks that a
texture instruction only reads it's payload and is unaware that it may
write to the first register so it may reorder it with respect to a read
from that register. This is causing issues in a couple of Dota 2 vertex
shaders.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104923
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
This helper used to load 16bit components from 32-bits read now allows
skipping components with the new parameter first_component. The semantics
now skip components until we reach the first_component, and then reads the
number of components passed to the function.
All previous uses of the helper are updated to use 0 as first_component.
This will allow read 16-bit components when the first one is not aligned
32-bit. Enabling more usages of untyped_reads with 16-bit types.
v2: (Jason Ektrand)
Change parameters order to first_component, num_components
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This looks like it should be protected by the assume() about
nr_color_regions, but my compiler warns anyway.
Reviewed-by: Matt Turner <mattst88@gmail.com>
The GPU hang caused by push constants is apparently fixed, so let's
enable them again.
Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: "18.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
18fde36ced changed the way temporary
registers were allocated in lower_integer_multiplication so that we
allocate regs_written(inst) space and keep the stride of the original
destination register. This was to ensure that any MUL which originally
followed the CHV/BXT integer multiply regioning restrictions would
continue to follow those restrictions even after lowering. This works
fine except that I forgot to reset the register file to VGRF so, even
though they were assigned a number from alloc.allocate(), they had the
wrong register file. This caused some GLES 3.0 CTS tests to start
failing on Sandy Bridge due to attempted reads from the MRF:
ES3-CTS.functional.shaders.precision.int.highp_mul_fragment.snbm64
ES3-CTS.functional.shaders.precision.int.mediump_mul_fragment.snbm64
ES3-CTS.functional.shaders.precision.int.lowp_mul_fragment.snbm64
ES3-CTS.functional.shaders.precision.uint.highp_mul_fragment.snbm64
ES3-CTS.functional.shaders.precision.uint.mediump_mul_fragment.snbm64
ES3-CTS.functional.shaders.precision.uint.lowp_mul_fragment.snbm64
This commit remedies this problem by, instead of copying inst->dst and
overwriting nr, just make a new register and set the region to match
inst->dst.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103626
Fixes: 18fde36ced
Cc: "17.3" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
We already had to switch all of the W types to UW to prevent issues
with vector immediates on gen10. We may as well use unsigned types
everywhere.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Gen 10 has a strange hardware bug involving V immediates with W types.
It appears that a mov(8) g2<1>W 0x76543210V will actually result in g2
getting the value {3, 2, 1, 0, 3, 2, 1, 0}. In particular, the bottom
four nibbles are repeated instead of the top four being taken. (A mov
of 0x00003210V yields the same result.) This bug does not appear in any
hardware documentation as far as we can tell and the simulator does not
implement the bug either.
Commit 6132992cdb was mostly a no-op
except that it changed the type of the subgroup invocation from UW to W
and caused us to tickle this bug with basically every compute shader
that uses any sort of invocation ID (which is most of them). This is
also potentially an issue for geometry shader input pulls and SampleID
setup. The easy solution is just to change the few places where we use
a vector integer immediate with a W type to use a UW type.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Cc: mesa-stable@lists.freedesktop.org
Fixes: 6132992cdb
We still have gpu hangs on Cannonlake when using push constants, so
disable them for now until we have a proper fix for these hangs.
v2: Add warning message when creating context too.
Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
In Vulkan, we don't support classic pull constants and everything the
client asks us to push, we push. However, for pushed UBOs, we still
want to fall back to conventional pulls if we run out of space.
This rewires the logic for assigning uniform locations to work in terms
of "complex alignments". The basic idea is that, as we walk the list of
instructions, we keep track of the alignment and continuity requirements
of each slot and assert that the alignments all match up. We then use
those alignments in the compaction stage to ensure that everything gets
placed at a properly aligned register. The old mechanism handled
alignments by special-casing each of the bit sizes and placing 64-bit
values first followed by 32-bit values.
The old scheme had the advantage of never leaving a hole since all the
64-bit values could be tightly packed and so could the 32-bit values.
However, the new scheme has no type size special cases so it handles not
only 32 and 64-bit types but should gracefully extend to 16 and 8-bit
types as the need arises.
Tested-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Unnecessary GRF bank conflicts increase the issue time of ternary
instructions (the overwhelmingly most common of which is MAD) by
roughly 50%, leading to reduced ALU throughput. This pass attempts to
minimize the number of bank conflicts by rearranging the layout of the
GRF space post-register allocation. It's in general not possible to
eliminate all of them without introducing extra copies, which are
typically more expensive than the bank conflict itself.
In a shader-db run on SKL this helps roughly 46k shaders:
total conflicts in shared programs: 1008981 -> 600461 (-40.49%)
conflicts in affected programs: 816222 -> 407702 (-50.05%)
helped: 46234
HURT: 72
The running time of shader-db itself on SKL seems to be increased by
roughly 2.52%±1.13% with n=20 due to the additional work done by the
compiler back-end.
On earlier generations the pass is somewhat less effective in relative
terms because the hardware incurs a bank conflict anytime the last two
sources of the instruction are duplicate (e.g. while trying to square
a value using MAD), which is impossible to avoid without introducing
copies. E.g. for a shader-db run on SNB:
total conflicts in shared programs: 944636 -> 623185 (-34.03%)
conflicts in affected programs: 853258 -> 531807 (-37.67%)
helped: 31052
HURT: 19
And on BDW:
total conflicts in shared programs: 1418393 -> 987539 (-30.38%)
conflicts in affected programs: 1179787 -> 748933 (-36.52%)
helped: 47592
HURT: 70
On SKL GT4e this improves performance of GpuTest Volplosion by 3.64%
±0.33% with n=16.
NOTE: This patch intentionally disregards some i965 coding conventions
for the sake of reviewability. This is addressed by the next
squash patch which introduces an amount of (for the most part
boring) boilerplate that might distract reviewers from the
non-trivial algorithmic details of the pass.
The following patch is squashed in:
SQUASH: intel/fs/bank_conflicts: Roll back to the nineties.
Acked-by: Matt Turner <mattst88@gmail.com>
load_ubo is using 32-bit loads as uniforms surfaces have a 32-bit
surface format defined. So when reading 16-bit components with the
sampler we need to unshuffle two 16-bit components from each 32-bit
component.
Using the sampler avoids the use of the byte_scattered_read message
that needs one message for each component and is supposed to be
slower.
v2: (Jason Ekstrand)
- Simplify component selection and unshuffling for different bitsizes
- Remove SKL optimization of reading only two 32-bit components when
reading 16-bits types.
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
v2: Fix alignment style (Topi Pohjolainen)
(Jason Ekstrand)
- Enable bit_size parameter to scattered messages to enable different
bitsizes byte/word/dword.
- Remove use of brw_send_indirect_scattered_message in favor of
brw_send_indirect_surface_message.
- Move scattered messages to surface messages namespace.
- Assert align1 for scattered messages and assume Gen8+.
- Inline brw_set_dp_byte_scattered_read.
v3: (Jason Ekstrand)
- Use renamed brw_byte_scattered_data_element_from_bit_size method
- Assert scattered read for Gen8+ and Haswell.
- Use conditional expresion at components_read.
- Include comment about params for scattered opcodes.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
v2: (Jason Ekstrand)
- Enable bit_size parameter to scattered messages to enable different
bitsizes byte/word/dword.
- Remove use of brw_send_indirect_scattered_message in favor of
brw_send_indirect_surface_message.
- Move scattered messages to surface messages namespace.
- Assert align1 for scattered messages and assume Gen8+.
- Inline brw_set_dp_byte_scattered_write.
v3: - Remove leftover newline (Topi Pohjolainen)
- Rename brw_data_size to brw_scattered_data_element and use
defines instead of an enum (Jason Ekstrand)
- Assert scattered write for Gen8+ and Haswell (Jason Ekstrand)
Signed-off-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Although from SPIR-V point of view, rounding modes are attached to the
operation/destination, on i965 it is a status, so we don't need to
explicitly set the rounding mode if the one we want is already set.
Taking into account that the default mode is RTE, one possible
optimization would be optimize out the first RTE set for each
block. For in order to work, we would need to take into account block
interrelationships. At this point, it is not worth to complicate the
optimization for such small gain.
v2: Use a single SHADER_OPCODE_RND_MODE opcode taking an immediate
with the rounding mode (Curro)
v3: Reset optimization for every block. (Jason Ekstrand)
Signed-off-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
We're going to want subgroup ID for SPIR-V subgroups eventually anyway.
We really only want to push one and calculate the other from it. It
makes a bit more sense to push the subgroup ID because it's simpler to
calculate and because it's a real API thing. The only advantage to
pushing the base thread ID is to avoid a single SHL in the shader.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
With the advent of SPIR-V subgroup operations, compute shaders will have
to be slightly different depending on the SIMD size at which they
execute. In order to allow us to do dispatch-width specific things in
NIR, we re-run the final NIR stages for each sIMD width.
One side-effect of this change is that we start rallocing fs_visitors
which means we need DECLARE_RALLOC_CXX_OPERATORS.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Previously, brw_nir_lower_intrinsics added the param and then emitted a
load_uniform intrinsic to load it directly. This commit switches things
over to use a specific NIR intrinsic for the thread id. The one thing I
don't like about this approach is that we have to copy thread_local_id
over to the new visitor in import_uniforms.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This isn't often a problem , when we're in a compute shader, we must
push the thread local ID so we decrement the amount of available push
space by 1 and it's no longer even and 64-bit data can, in theory, span
it. By marking those uniforms contiguous, we ensure that they never get
split in half between push and pull constants.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
The only things that adjust fs_visitor::max_dispatch_width are render
target writes which don't happen in compute shaders so they're
pointless.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
It's 8 for everything except compute shaders. For compute shaders,
there's no need to duplicate the computation and it's just a possible
source of error.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Before, we bailing in assign_constant_locations based on the minimum
dispatch size. The more direct thing to do is simply to check for
whether or not we have constant locations and bail if we do. For
nir_setup_uniforms, it's completely safe to do it multiple times because
we just copy a value from the NIR shader.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Some hardware (CHV, BXT) have special restrictions on register regions
when doing integer multiplication. We want to respect those when we
lower to DxW multiplication.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
Before, we were careful to place the zip after the last of the split
instructions but did unzip on-demand. This changes things so that the
unzips go before all of the split instructions and the unzip comes
explicitly after all the split instructions. As a side-effect of this
change, we now emit the split instruction from highest SIMD group to
lowest instead of low to high. We could have kept the old behavior, but
it shouldn't matter and this made the code easier.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
This makes it far more explicit where we're inserting the instructions
rather than the magic "before and after" stuff that the emit_[un]zip
helpers did based on block and inst.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
Thanks to the ralloc invariant of "any pointer returned from ralloc can
be used as a context", calling ralloc_size with a size of zero will
cause it to allocate at least a header. If we don't have any push
constants, then NULL is perfectly acceptable (and even preferred).
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
It doesn't actually matter since the only user of push constants, i965,
ralloc_steals it back to NULL but it's more consistent and probably
fixes memory leaks in some error cases.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Cc: mesa-stable@lists.freedesktop.org
The caller can now use brw_stage_prog_data::program_size which is set
by the brw_compile_* functions.
Cc: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This will be used by the on disk shader cache.
v2:
* Set in brw_compile_* rather than brw_codegen_*. (Jason)
Signed-off-by: Timothy Arceri <timothy.arceri@collabora.com>
[jordan.l.justen@intel.com: Only add to brw_stage_prog_data]
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Patch uses mem_ctx for allocation to ensure param array gets freed
later.
==6164== 48 bytes in 1 blocks are definitely lost in loss record 61 of 193
==6164== at 0x4C2EB6B: malloc (vg_replace_malloc.c:299)
==6164== by 0x12E31C6C: ralloc_size (ralloc.c:121)
==6164== by 0x130189F1: fs_visitor::assign_constant_locations() (brw_fs.cpp:2095)
==6164== by 0x13022D32: fs_visitor::optimize() (brw_fs.cpp:5715)
==6164== by 0x13024D5A: fs_visitor::run_fs(bool, bool) (brw_fs.cpp:6229)
==6164== by 0x1302549A: brw_compile_fs (brw_fs.cpp:6570)
==6164== by 0x130C4B07: blorp_compile_fs (blorp.c:194)
==6164== by 0x130D384B: blorp_params_get_clear_kernel (blorp_clear.c:79)
==6164== by 0x130D3C56: blorp_fast_clear (blorp_clear.c:332)
==6164== by 0x12EFA439: do_single_blorp_clear (brw_blorp.c:1261)
==6164== by 0x12EFC4AF: brw_blorp_clear_color (brw_blorp.c:1326)
==6164== by 0x12EFF72B: brw_clear (brw_clear.c:297)
Fixes: 8d90e28839 ("intel/compiler: Allocate pull_param in assign_constant_locations")
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable@lists.freedesktop.org
Fixes intermittent GPU hangs on Broxton with an Intel internal
test case.
There are plenty of similar fragment shaders in piglit that do
not use any varyings and any uniforms. According to the
documentation special timing is needed between pipeline stages.
Apparently we just don't hit that with piglit. Even with the
failing test case one doesn't always get the hang.
Moreover, according to the error states the hang happens
significantly later than the execution of the problematic shader.
There are multiple render cycles (primitive submissions) in between.
I've also seen error states where the ACTHD points outside the
batch. Almost as if the hardware writes somewhere that gets used
later on. That would also explain why piglit doesn't suffer from
this - most tests kick off one render cycle and any corruption
is left unseen.
v2 (Ken): Instead of enabling push constants, enable one of the
inputs (PSIZ).
v3 (Ken, Jason): Use LAYER instead making vulkan emit_3dstate_sbe()
happy.
Cc: "17.3 17.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
In order to implement the ballot intrinsic, we do a MOV from flag
register to some GRF. If that GRF is used in a SEL, cmod propagation
helpfully changes it into a MOV from the flag register with a cmod.
This is perfectly valid but when lower_simd_width comes along, it simply
splits into two instructions which both have conditional modifiers.
This is a problem since we're reading the flag register. This commit
makes us check whether or not flags_written() overlaps with the flag
values that we are reading via the instruction source and, if we have
any interference, will force us to emit a copy of the source.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Cc: mesa-stable@lists.freedesktop.org
This eliminates a layer of wrapping, and makes a backend_instruction
sufficient. The downside is that it exposes 'eot' to the vec4 backend,
which it doesn't need, but can basically happily ignore.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Tested-by: Pallavi G <pallavi.g@intel.com>
This is a lot more natural than special casing it all over the place.
We still have to do a bit of special-casing in assign_constant_locations
but it's not special-cased quite as bad as it was before.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Now that everything is nicely ralloc'd, we can allocate the pull_param
array in assign_constant_locations instead of higher up. We can also
re-allocate the param array so that it's exactly the needed size. This
should save us some memory because we're not allocating the total needed
param space for both push and pull.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Instead of making the caller of brw_compile_cs add something to the
param array for thread_local_id_index, just add it on-demand in
brw_nir_intrinsics and grow the array. This is now safe to do because
everyone is now using ralloc for prog_data::param.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
It's already only ever called from brw_compile_cs and only handles
compute intrinsics. Let's just make it CS-specific. We can always
make it handle other stages again later if we want.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
