This instruction is used to ensure that TMU stores have been processed
before moving on. In particular, you need any TMU ops to be done by the
time the shader ends.
This is controlled by a new nir_shader_compiler_options flag, and fixes
dEQP-GLES3.functional.shaders.builtin_variable.pointcoord on V3D.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
We can do one per instruction, and we have to be careful not to overwrite
raddr_b, but this greatly reduces the pressure on uniform loads
(particularly around ldvpm/stvpm instructions).
total instructions in shared programs: 90768 -> 88220 (-2.81%)
instructions in affected programs: 82711 -> 80163 (-3.08%)
Sometimes when iterating over sources, we might want to check if it's the
implicit one. We wouldn't want to match on a non-implicit src using this
function.
These instructions let us write directly to the phys regfile, instead of
just R4. That lets us avoid moving out of R4 to avoid conflicting with
other SFU results, and to avoid conflicting with thread switches.
There is still an extra instruction of latency, which is not represented
in the scheduler at the moment. If you use the result before it's ready,
the QPU will just stall, unlike the magic R4 mode where you'd read the
previous value. That means that the following shader-db results aren't
quite representative (since we now cause some stalls instead of emitting
nops), but they're impressive enough that I'm happy with the change.
total instructions in shared programs: 95669 -> 91275 (-4.59%)
instructions in affected programs: 82590 -> 78196 (-5.32%)
Similarly to VC4's implementation, by not picking r0 immediately upon
freeing it, we give the scheduler more of a chance to fit later writes in
earlier. I'm not clear on whether there's any real cost to picking phys
over accumulators, so keep that behavior for now.
shader-db:
total instructions in shared programs: 96831 -> 95669 (-1.20%)
instructions in affected programs: 77254 -> 76092 (-1.50%)
This restriction existed in V3D 2.x, but lifting it was a major change in
3.x.
shader-db results:
total instructions in shared programs: 98117 -> 96831 (-1.31%)
instructions in affected programs: 48520 -> 47234 (-2.65%)
total instructions in shared programs: 98578 -> 98119 (-0.47%)
instructions in affected programs: 27571 -> 27112 (-1.66%)
and it also eliminates most spills/fills on the CTS's randomized uniform
usage testcases.
There's a convenient "FTOC" instruction for generating the coverage now,
unlike vc4. This fixes
dEQP-GLES3.functional.multisample.fbo_4_samples.proportionality_alpha_to_coverage
Fixes simulator assertion failures in
dEQP-GLES3.functional.shaders.texture_functions.texture.samplercubeshadow_bias_fragment
and similar complicated cases.
The docs called this field "uses both center W and centroid W", but
actually it's "do you need center W even if varyings don't obviously call
for it?"
Fixes dEQP-GLES3.functional.shaders.builtin_variable.fragcoord_w
These together get the GLSL 3.00 unorm/snorm pack functions and
MESA_shader_integer operations working.
v2: Fix commit message typo.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
It would be nice to share the flags packet emit logic with flat shade
flags, but I couldn't come up with a good way while still using our pack
macros. We need to refactor this to shader record setup at compile time,
anyway.
Fixes ext_framebuffer_multisample-interpolation * centroid-*
The next shader gets to start writing the register file during these
slots, so make sure we don't stomp over them.
The only case of hitting this that I could imagine would be dead writes.
The new name make the zero-input behavior more obvious. The next
patch adds a new function with different zero-input behavior.
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Suggested-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
In the absence of a general NIR or VIR-level scheduler, this at least
avoids spilling in
GTF-GLES3.gtf.GL3Tests.uniform_buffer_object.uniform_buffer_object_storage_layouts
Our backend needs some sort of vertex position value to emit the scaled
viewport values and such. Fixes potential segfaults in
KHR-GLES3.copy_tex_image_conversions.required.cubemap_negx_cubemap_negx
Unfortunately TGSI doesn't record the type of the FS output like GLSL
does, but VC5's TLB writes depend on the output's base type. Just record
the type in the key at variant compile time when we've got a TGSI input
and then fix it up.
Fixes KHR-GLES3.packed_pixels.pbo_rectangle.rgba32i/ui and apparently a
GPU hang that breaks most tests that come after it.
Our register spilling support is nice to have since vc4 couldn't at all,
but we're still very restricted due to needing to not spill during a TMU
operation, or during the last segment of the program (which would be nice
to spill a value of, when there's a long-lived value being passed through
with little modification from the start to the end).
We could do better by emitting unspills for the last-segment values just
before the last thrsw, since the last segment is probably not the maximum
interference area.
Fixes GTF uniform_buffer_object_arrays_of_all_valid_basic_types and 3
others.
Obviously it would be good to have an ADD and a MUL and a signal together,
but we can even potentially have multiple signals merged, as well.
total instructions in shared programs: 100423 -> 97874 (-2.54%)
instructions in affected programs: 78812 -> 76263 (-3.23%)
We emit some MOVs to track lifetimes of payload registers, but we don't
need there to be actual MOV instructions for them.
total instructions in shared programs: 101045 -> 100423 (-0.62%)
instructions in affected programs: 37083 -> 36461 (-1.68%)
