If they never get used, dead code should clean them up. Also, we rework
the at_offset and at_sample intrinsics so they return a proper vec2
instead of returning things in PLN layout. Fortunately, copy-prop is
pretty good at cleaning this up and it doesn't result in any actual
extra MOVs.
Reviewed-by: Matt Turner <mattst88@gmail.com>
The simulator complains about using byte operands, we also have
documentation telling us.
Note that add operations on bytes seems to work fine on HW (like ADD).
Using dwords operands with CMP & SEL fixes the following tests :
dEQP-VK.spirv_assembly.type.vec*.i8.*
v2: Drop the GLK changes (Matt)
Add validator tests (Matt)
v3: Drop GLK ref (Matt)
Don't mix float/integer in MAD (Matt)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com> (v1)
Reviewed-by: Matt Turner <mattst88@gmail.com>
BSpec: 3017
Cc: <mesa-stable@lists.freedesktop.org>
This is the same as the need_dest parameter to
prepare_alu_destination_and_sources. This allows us to not change the
register that is expected to hold an result if an instruction is
re-emitted. This is particularly a problem if the re-emitted
instruction is a partial write. A later patch will use this feature.
No shader-db changes on any Intel platform.
v2: Don't do the Boolean resolve when there is no destination. If the
ALU instruction didn't write a register, there's nothing to resolve.
This replaces an earlier patch "intel/fs: Allocate dummy destination
register when need_dest is false".
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
With 8 and 16-bit types and anything where we have to use non-trivial
strides registersto deal with restrictions, we end up with things that
look like partial writes even though we don't care about any values in
the register except those written by that instruction. This is
particularly important when dealing with loops because liveness sees
is_partial_write and the fact that an old version from a previous loop
iteration may be valid at that point and extends all purely partially
written values to the entire loop.
This commit adds a new UNDEF instruction which does nothing (the
generator doesn't emit anything) but which does a fake write to the
register. This informs liveness that we don't care about any values
before that point so it won't consider those registers to be falsely
live. We can safely emit UNDEF instructions for all SSA values that
come in from NIR and nearly all temporaries generated by various stages
of the compiler. In particular, we need to insert UNDEF instructions
when we handle region restrictions because the newly allocated registers
are almost guaranteed to be partially written.
No shader-db changes.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110432
Reviewed-by: Matt Turner <mattst88@gmail.com>
We set header_present but then pass it some random garbage. Give it g0
instead. I'm not actually sure this does anything but g0 is the usual
header data and this is what the windows driver does so it seems like a
good idea.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
The difference between imov and fmov has been a constant source of
confusion in NIR for years. No one really knows why we have two or when
to use one vs. the other. The real reason is that they do different
things in the presence of source and destination modifiers. However,
without modifiers (which many back-ends don't have), they are identical.
Now that we've reworked nir_lower_to_source_mods to leave one abs/neg
instruction in place rather than replacing them with imov or fmov
instructions, we don't need two different instructions at all anymore.
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Rob Clark <robdclark@chromium.org>
Our tessellation control shaders can be dispatched in several modes.
- SINGLE_PATCH (Gen7+) processes a single patch per thread, with each
channel corresponding to a different patch vertex. PATCHLIST_N will
launch (N / 8) threads. If N is less than 8, some channels will be
disabled, leaving some untapped hardware capabilities. Conditionals
based on gl_InvocationID are non-uniform, which means that they'll
often have to execute both paths. However, if there are fewer than
8 vertices, all invocations will happen within a single thread, so
barriers can become no-ops, which is nice. We also burn a maximum
of 4 registers for ICP handles, so we can compile without regard for
the value of N. It also works in all cases.
- DUAL_PATCH mode processes up to two patches at a time, where the first
four channels come from patch 1, and the second group of four come
from patch 2. This tries to provide better EU utilization for small
patches (N <= 4). It cannot be used in all cases.
- 8_PATCH mode processes 8 patches at a time, with a thread launched per
vertex in the patch. Each channel corresponds to the same vertex, but
in each of the 8 patches. This utilizes all channels even for small
patches. It also makes conditions on gl_InvocationID uniform, leading
to proper jumps. Barriers, unfortunately, become real. Worse, for
PATCHLIST_N, the thread payload burns N registers for ICP handles.
This can burn up to 32 registers, or 1/4 of our register file, for
URB handles. For Vulkan (and DX), we know the number of vertices at
compile time, so we can limit the amount of waste. In GL, the patch
dimension is dynamic state, so we either would have to waste all 32
(not reasonable) or guess (badly) and recompile. This is unfortunate.
Because we can only spawn 16 thread instances, we can only use this
mode for PATCHLIST_16 and smaller. The rest must use SINGLE_PATCH.
This patch implements the new 8_PATCH TCS mode, but leaves us using
SINGLE_PATCH by default. A new INTEL_DEBUG=tcs8 flag will switch to
using 8_PATCH mode for testing and benchmarking purposes. We may
want to consider using 8_PATCH mode in Vulkan in some cases.
The data I've seen shows that 8_PATCH mode can be more efficient in
some cases, but SINGLE_PATCH mode (the one we use today) is faster
in other cases. Ultimately, the TES matters much more than the TCS
for performance, so the decision may not matter much.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Since 09f1de97a7 "anv,i965: Lower away image derefs in the driver"
the backend compiler is not expected to handle any derefs, so let's
assert on it.
This helps identifying problems when a deref is not lowered and
"leaks" into the backend compiler.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
While we can clean this up later, it's trivial to not generate the
stupid code in the first place, which saves some optimization work.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
These will be lowered by nir_lower_tex() with the
lower_tex_when_implicit_lod_not_supported, so don't need the extra
handling here.
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Move the scalar-region conversion from the IR to the generator, so it
doesn't affect the Gen11 path. We need the non-scalar regioning
for a later lowering pass that we are adding.
v2: Better commit message (Matt)
Reviewed-by: Matt Turner <mattst88@gmail.com>
Commit ad98fbc217 ("intel/fs: Refactor code generation for nir_op_fsign
to its own function") criss-crossed with c2b8fb9a81 ("anv/device:
expose VK_KHR_shader_float16_int8 in gen8+"), and I was not paying
enough attention when I rebased. This adds back the float16 changes and
enables the optimization.
v2: Incorporate more changes from 19cd2f5deb and a8d8b1a139 that I
missed in the previous version.
Fixes: ad98fbc217 ("intel/fs: Refactor code generation for nir_op_fsign to its own function")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110474
Reviewed-by: Matt Turner <mattst88@gmail.com> [v1]
We add two new texture sources for bindless surface and sampler handles.
Bindless surface handles are expected to be pre-shifted so that the
20-bit surface state table index is in the top 20 bits of the 32-bit
handle. This lets us avoid any extra shifts in the shader. Bindless
sampler handles are 32-byte aligned byte offsets from general state base
address. We use 32-byte aligned instead of 16-byte aligned to avoid
having to use more indirect messages than needed. It means we can't
tightly pack samplers but that's probably not a big deal.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Normally fsign generates -1, 0, or +1. The new scale factor, S, causes
fsign to generate -S, 0, or +S.
v2: Rebase on v2 changes in previous commit.
v3: Rebase on 85c35885b3 ("nir: Rework nir_src_as_alu_instr to not take
a pointer").
Reviewed-by: Matt Turner <mattst88@gmail.com> [v2]
Other nir_src_as_* functions just take a nir_src. It's not that much
more memory copying and the constness preserving really isn't worth the
cognitive dissonance.
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Now that we have the regioning lowering pass we can just put all of these
opcodes together in a single block and we can just assert on the few cases
of conversion instructions that are not supported in hardware and that should
be lowered in brw_nir_lower_conversions.
The only cases what we still handle separately are the conversions from float
to half-float since the rounding variants would need to fallthrough and we
are already doing this for boolean opcodes (since they need to negate), plus
there is also a large comment about these opcodes that we probably want to
keep so it is just easier to keep these separate.
Suggested-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
v2:
- make 16-bit be its own separate case (Jason)
v3:
- Drop the result_int temporary (Jason)
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com> (v1)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
There are some hardware restrictions that brw_nir_lower_conversions should
have taken care of before we get here.
v2:
- rebased on top of regioning lowering pass
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com> (v1)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Since we handle booleans as integers this makes more sense.
v2:
- rebased to incorporate new boolean conversion opcodes
v3:
- rebased on top regioning lowering pass
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> (v1)
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com> (v2)
Going forward having these split is a bit more convenient since these two
groups have different restrictions.
v2:
- Rebased on top of new regioning lowering pass.
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com> (v1)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
v2: remove & operator in a couple of memsets
add some memsets
v3: fixup lima
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> (v2)
In the old code, we would generate the exact same instruction for
extract_u8(some_u64, 0) and extract_u8(some_u64, 1). The mask-a-word
trick only works for even numbered bytes.
This fixes the (new) piglit test
tests/spec/arb_gpu_shader_int64/execution/fs-ushr-and-mask.shader_test.
v2: Use a SHR instead of an AND. This saves an instruction compared to
using two moves. Suggested by Jason.
Fixes: 6ac2d16901 ("i965/fs: Fix extract_i8/u8 to a 64-bit destination")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
We need more space than just a 32-bit scalar and we have to burn all
that space anyway so we may as well expose it to the driver. This also
fixes a subtle bug when UBOs and SSBOs have different pointer types.
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
On Gen 8 and 9, "mul" instruction supports 64 bit destination type. We
can reduce our 64x64 int multiplication from 4 instructions to 3.
Also instead of emitting two mul instructions, we can emit single mul
instuction and extract low/high 32 bits from 64 bit result for
[i/u]mulExtended
v2: 1) Allow lower_mul_high64 to use new opcode (Jason Ekstrand)
2) Add lower_mul_2x32_64 flag (Matt Turner)
3) Remove associative property as bit size is different (Connor
Abbott)
v3: Fix indentation and variable naming convention (Jason Ekstrand)
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This ran afoul of Iris's use of nir_lower_clamp_color_outputs which
applies fsat() before writes to vertex shader color outpus.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Fixes: 7725d60938 ("intel/fs: Emit better code for b2f(inot(a)) and b2i(inot(a))")
Other places will need to do this soon to properly handle source
swizzles. The patch looks a little odd, but the change is pretty
straight forward. All of the swizzle and mask handling is moved out,
but the code for handling move instructions and vecN instructions
remains in nir_emit_alu.
I'm not terribly pleased with the "need_dest" parameter, but
get_nir_dest is (somewhat surprisingly) destructive. I am open to
suggestions of alternatives.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
All of the actual abstraction (except possibly setting size_written)
happens as part of the logical opcodes. The only thing that the surface
builder is providing at this point is extra levels of functions to call
through. I'm going to be adding bindless image support soon and all the
extra abstraction here is just getting in the way.
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
This fixes a bug in runscape where we were optimizing x >> 16 to an
extract and then negating and converting to float. The NIR to fs pass
was dropping the negate on the floor breaking a geometry shader and
causing it to render nothing.
Fixes: 1f862e923c "i965/fs: Optimize float conversions of byte/word..."
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109601
Tested-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
