The polynomial used for asin_expr() was suboptimal (and its source was
not documented).
A better approximation is found in the _Handbook_of_Mathematical_Functions_
by Abramowitz and Stegun, which is used in Nvidia's Cg toolkit. However,
while this approximation gives a good absolute error bound, its relative
error exceeds the 4096 ulp allowed by the Vulkan spec. Taking a page
from the spirv implementation of asin(), we implement a piecewise
approximation where a Taylor series is used for small values of |x|.
This patch also harmonizes the GLSL and Vulkan implementations by moving
the implementation to common code (nir_builder).
Running tests on asin() with a grid of 64000 samples between 0.0 and +1.0,
the original asin() at 32 bits has:
```
glsl spirv
RMSE: 1.756451e-04 1.609091e-04
worst abs error: 3.904104e-04 at 0.937001 3.904104e-04 at 0.937001
worst ulp error: 11800 at 6.2499e-05 3826 at 0.841331
```
whereas the new implementation has for both:
```
RMSE: 2.528056e-05
worst abs error: 4.962087e-05 at 0.451149
worst ulp error: 2379 at 0.215106
```
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Acked-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40862>
Unifies nir per instruction float control.
In the future this can be split into contract/reassoc/transform
like SPIR-V.
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com> (except SPIR-V)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39103>
Floating point ALU assume no NaNs unless
FLOAT_CONTROLS_SIGNED_ZERO_INF_NAN_PRESERVE_FPn or (for some opcodes)
exact=true.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Fixes: bf9c1699cd ("nir: add nir_fisnan helper function")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22206>
This failed to take fabs of the first component, implementing an unintended
formula that would return the right results in some common cases but is wrong in
general:
max { x, |y|, |z| }
instead of the intended
max { |x|, |y|, |z| }
Reexpress the implementation to make correctness obvious.
Fixes: 272e927d0e ("nir/spirv: initial handling of OpenCL.std extension opcodes")
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18754>
ctz is a CL2.0 opcode but 3.0 requires it as well so just add support
for it.
Tested against CTS integer_ops integer_ctz test.
(long line broken up)
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7468>
All of these are pretty well-defined. Rather than implementing them
as a sequence of nir ops, we can just use the libclc implementation.
v2 (idr): Delete functions that are now unused.
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6035>
It was always fneu but naming it fne causes confusion from time to time. So
lets rename it. Later we also want to add other unordered and fne, this is
a smaller preparation for that.
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6377>
So far only the singed versions are defined.
v2: Make umad24 and umul24 non-driver specific (Eric Anholt)
v3: Take care of nir_builder and automatic lowering of the
opcodes if they are not supported by the backend.
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4610>
Because it's in double-quotes, it will search the current folder before
any search paths. Since nir_builder.h and nir_builtin_builder.h are in
the same folder, this guarantees a correct include. However,
nir/nir_builder.h does not unless the includer's path is set up just
right.
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3897>
Moves build_atan and build_atan2 into nir_builtin_builder. The goal is
to be able to use this from the GLSL translator too.
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Not complete, mostly just adding things as I encounter them in CTS. But
not getting far enough yet to hit most of the OpenCL.std instructions.
Anyway, this is better than nothing and covers the most common builtins.
v2: add hadd proof from Jason
move some of the lowering into opt_algebraic and create new nir opcodes
simplify nextafter lowering
fix normalize lowering for inf
rework upsample to use nir_pack_bits
add missing files to build systems
v3: split lines of iadd/sub_sat expressions
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
we define it inside 'include/c99_math.h' so it is safe to use.
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
also move some of the GLSL builtins over we will need for implementing
some OpenCL builtins
v2: replace NIR_IMM_FP by nir_imm_floatN_t in ported code
fix up changes caused by swizzle rework
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
