Previously, the register demand per instruction was calculated as the number of
live variables in the register file after executing an instruction plus additional
temporary registers, necessary during the execution of the instruction.
With this change, now it also includes all variables which are live right before
executing an instruction, i.e. killed Operands.
Care has been taken so that the invariant
register_demand[idx] = register_demand[idx - 1] - get_temp_registers(prev_instr)
+ get_live_changes(instr) + get_temp_registers(instr)
still holds.
Slight changes in scheduling:
Totals from 316 (0.40% of 79395) affected shaders: (GFX11)
Instrs: 301329 -> 300777 (-0.18%); split: -0.31%, +0.12%
CodeSize: 1577976 -> 1576204 (-0.11%); split: -0.21%, +0.10%
SpillSGPRs: 448 -> 447 (-0.22%)
Latency: 1736349 -> 1726182 (-0.59%); split: -2.01%, +1.42%
InvThroughput: 243894 -> 243883 (-0.00%); split: -0.03%, +0.03%
VClause: 6134 -> 6280 (+2.38%); split: -1.04%, +3.42%
SClause: 6142 -> 6137 (-0.08%); split: -0.13%, +0.05%
Copies: 14037 -> 14032 (-0.04%); split: -0.56%, +0.52%
Branches: 3284 -> 3283 (-0.03%)
VALU: 182750 -> 182718 (-0.02%); split: -0.04%, +0.03%
SALU: 18522 -> 18538 (+0.09%)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29804>
LLVM does something similar: https://reviews.llvm.org/D153295
fossil-db (gfx1100):
Totals from 21 (0.02% of 133461) affected shaders:
Instrs: 147428 -> 147396 (-0.02%)
CodeSize: 797188 -> 797060 (-0.02%)
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Fixes: 2930317cea ("aco/gfx11: deallocate VGPRs at the end of the shader")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24669>
Usually the register demand before an instruction would be considered part
of the previous instruction, since it's not greater than the register
demand for that previous instruction. Except, it can be greater in the
case of an definition fixed to a non-killed operand: the RA needs to
reserve space between the two instructions for the definition (containing
a copy of the operand).
fossil-db (navi21):
Totals from 5 (0.00% of 135636) affected shaders:
PreVGPRs: 35 -> 40 (+14.29%)
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8807
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22446>
A future commit will make VCC register assignment independent
from register hints. Up to GFX9, VCC can alternatively be used
as regular SGPR, so prevent overlap.
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15408>
Before PS waves are launched, PS inputs are moved from PC to LDS
and the corresponding part of the PC is deallocated.
Each PS input occupies 3 * vec4 (3 * 16 = 48 bytes) of LDS space.
See Figure 10.3 in the GCN3 ISA manual.
These limit occupancy the same way as other stages' LDS usage does.
Note that PS can request additional LDS space via EXTRA_LDS_SIZE,
so that also must be taken into account here.
No Fossil DB changes.
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12517>
Since copies for the successor's linear phis are inserted before the
branch, we should consider the definitions and operands of the successor's
linear phis.
Fixes a Detroit: Become Human spilling failure with GCM+GVN.
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/12035>
This is used when printing the program and to avoid updating register
demand during post-RA liveness analysis.
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/10315>
It isn't intended to be accurate after RA, so num_waves can become zero,
breaking the sgpr_limit calculation.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10315>
Instead of assuming WGP mode on GFX10+ in different places, add a member
to Program that can be used instead.
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/8761>
This patch delays the calculation of GPR limits in order to
precisely incorporate extra registers (VCC etc.) and shared VGPRs.
Additionally, the allocation granularity is used to set the config.
This has some effect on the reported SGPR stats.
Totals (Navi10):
SGPRs: 6971787 -> 17753642 (+154.65%)
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8921>
This also switches the alloc_granule of Tonga and Iceland
to 96, so that the calculation is consistent.
Also changes the granularity for RDNA to 16 to keep
better stats with the upcoming patch.
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8921>
This seems to be much faster than hash sets. When compiling pipelines from
5 games, live_var_analysis takes about a third the time it used to and
fossilize-replay is ~1.77% faster.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Tony Wasserka <tony.wasserka@gmx.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6733>
The upcoming change will allow to report all ACO errors (or warnings)
directly to the app via VK_EXT_debug_report. This is similar to what
we already do for reporting various SPIRV->NIR errors.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6318>
