This limits the address register to simple cases inside a block.
Validation ensures that the address register is only written once and
read once.
Instruction scheduling makes sure that instructions using the address
register in the generator are not scheduled while there is an usage of
the register in the IR.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28199>
force_gl_names_reuse is changed to integer.
-1 means default (currently disabled), 0 means disabled, 1 means enabled
The names reuse initialization is moved to _mesa_alloc_shared_state ->
_mesa_InitHashTable instead of _mesa_HashEnableNameReuse.
It will be enabled by default.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32715>
Rather than emitting FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD to do block
loads that were cacheline aligned, loading entire cachelines at a time,
we now rely on NIR passes to group, CSE, and vectorize things into
appropriately sized blocks. This means that we'll usually still load
a cacheline, but we may load only 32B if we don't actually need anything
from the full 64B. Prior to Xe2, this saves us registers, and it ought
to save us some bandwidth as well as the response length can be lowered.
The cacheline-aligning hack was the main reason not to simply call
fs_nir_emit_memory_access(), so now we do that instead, porting yet
one more thing to the common memory opcode framework.
We unfortunately still emit the old FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD
opcode for non-block intrinsics. We'd have to clean up 16-bit handling
among other things in order to eliminate this, but we should in the
future.
fossil-db results on Alchemist for this and the previous patch together:
Instrs: 161481888 -> 161297588 (-0.11%); split: -0.12%, +0.01%
Subgroup size: 8102976 -> 8103000 (+0.00%)
Send messages: 7895489 -> 7846178 (-0.62%); split: -0.67%, +0.05%
Cycle count: 16583127302 -> 16703162264 (+0.72%); split: -0.57%, +1.29%
Spill count: 72316 -> 67212 (-7.06%); split: -7.25%, +0.19%
Fill count: 134457 -> 125970 (-6.31%); split: -6.83%, +0.52%
Scratch Memory Size: 4093952 -> 3787776 (-7.48%); split: -7.53%, +0.05%
Max live registers: 33037765 -> 32947425 (-0.27%); split: -0.28%, +0.00%
Max dispatch width: 5780288 -> 5778536 (-0.03%); split: +0.17%, -0.20%
Non SSA regs after NIR: 177862542 -> 178816944 (+0.54%); split: -0.06%, +0.60%
In particular, several titles see incredible reductions in spill/fills:
Shadow of the Tomb Raider: -65.96% / -65.44%
Batman: Arkham City GOTY: -53.49% / -28.57%
Witcher 3: -16.33% / -14.29%
Total War: Warhammer III: -9.60% / -10.14%
Assassins Creed Odyssey: -6.50% / -9.92%
Red Dead Redemption 2: -6.77% / -8.88%
Far Cry: New Dawn: -7.97% / -4.53%
Improves performance in many games on Arc A750:
Cyberpunk 2077: 5.8%
Witcher 3: 4%
Shadow of the Tomb Raider: 3.3%
Assassins Creed: Valhalla: 3%
Spiderman Remastered: 2.75%
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
The hope here is to replace our backend handling for loading whole
cachelines at a time from UBOs into NIR-based handling, which plays
nicely with the NIR load/store vectorizer.
Rounding down offsets to multiples of 64B allows us to globally CSE
UBO loads across basic blocks. This is really useful. However, blindly
rounding down the offset to a multiple of 64B can trigger anti-patterns
where...a single unaligned memory load could have hit all the necessary
data, but rounding it down split it into two loads.
By moving this to NIR, we gain more control of the interplay between
nir_opt_load_store_vectorize and this rebasing and CSE'ing. The backend
can then simply load between nir_def_{first,last}_component_read() and
trust that our NIR has the loads blockified appropriately.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
The NIR vectorizer may produce block loads with unread trailing
components. Upcoming passes may produce unread leading components
as well. With a bit of finesse, we can skip loading those, and only
bother with the ones we actually need. This can sometimes save us on
loads and MOVs.
v2: Skip this for SLM reads on pre-LSC platforms (caught by Lionel).
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
If we pass an immediate, just trivially return that immediate.
This preserves the property that if x was an IMM, emit_uniformize(x)
will also be an IMM, without the need for optimizations to eliminate
unnecessary operations. That way, you can call emit_uniformize() on
a value and still check whether it's constant afterwards.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
We return an immediate for 32-bit constant values, but fall back to
calling get_nir_src() for other values, as 64-bit, and even 8-bit
immediates have odd restrictions. We could probably support 16-bit
here without too many issues, but we leave it be for now.
This makes it usable for case where we'd like to get constants for
32-bit values but where it may be a different bit-size too.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
We were already skipping unread trailing components, but now we skip
them on both ends.
About -3.5% spills on Shadow of the Tomb Raider on Alchemist (mostly a
wash elsewhere, but it will help additional shaders with later patches).
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
HDC doesn't support block loads/stores with sub-DWord (<4B) aligned
offsets, and shared local memory has to use the Aligned OWord Block
messages which require OWord (16B) alignment.
Make the validator detect this case and say no. Also make the lowering
code assert that the alignment is valid as a second line of defense.
LSC has no such restrictions.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32888>
This patch exposes shader hashes (computes and draws) to Perfetto and
utrace. By including these hashes in traces, developers can correlate
compute and draw calls with their assoicated ASM dumps when analyzing
the traces.
To achieve this, intel_tracepoint.py has been reworked to preprocess
tracepoint arguments dynamically. Any argument containing "hash" in its
variable name is now forrmated as hexadecimal before being passed to the
tracepoint definition.
Signed-off-by: Michael <michael.cheng@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32708>
