Added batched llvm code gen for: llvm_gen_blackbody, llvm_gen_luminance, llvm_gen_transformc (including code gen of loop to identify unique "from" and "to" space combinations to call library function with).
Made ColorSystem const correct.
Pulled much of ColorSystem's implementation into src/liboslexec/opcolor_impl.h so it could be inlined in both opcolor.cpp and wide_opcolor.cpp.
To enable SIMD fast path for ColorSystem::blackbody_rgb added new methods to expose underlying lookup table optimization.
bool can_lookup_blackbody(float T /*Kelvin*/) const;
Color3 lookup_blackbody_rgb (float T /*Kelvin*/) const;
Color3 compute_blackbody_rgb (float T /*Kelvin*/) const;
When can_lookup_blackbody() returns true
then lookup_blackbody_rgb can be safely called,
otherwise the expensive compute_blackbody_rgb is required.
Updated implementation of ColorSystem to succesfully vectorize on multiple compilers, optimized lookup table data types and indexed dereferences to generate prefered 32bit indexed gathers vs 64bit gathers which require multiple instructions and registers.
To improve code generation and less chances of aliasing issues, changed nested M[i][j] operator access to Matrix in ImathMatrix.h to directly access underlying 2d array M.x[i][j] also changed Vector operator V[i] to directly access V.x, V.y, V.z in OSL/IMathx/IMath*.h
Moved helper testIfAnyLaneIsNonZero from wide_opmatrix.cpp to be testIfAnyLaneIsNonZero in OSL/wide.h
Added sfm::min_val to provide an implementation of min which returns values not references to the original through a ternary (which can cause issues with vectorization). Added Clang specific sfm::min_val and sfm::max_val implementations to assist in vectorization.
Enabled BATCHED execution of existing testsuites: blackbody, color, transformc, wavelength_color
Added new testsuite BATCHED regression tests: blackbody-reg, color-reg, luminance-reg, transformc-reg, wavelength_color-reg
Added sfm::min_val to provide an implementation of min which returns values not references to the original through a ternary (which can cause issues with vectorization). Added Clang specific sfm::min_val and sfm::max_val implementations to assist in vectorization.
Signed-off-by: Alex M. Wells <alex.m.wells@intel.com>
* Adopt OIIO calls to fast_cbrt and fast_expm1 for blackbody computation.
Use single precision for bb_spectrum object/operator and manually implement std::pow(wlm,-5.0f) to better enable vectorization.
Reduced masked code generation for rgb_to_hsl.
Removed duplicated code by implementing ColorSystem::blackbody_rgb(T) in terms of ColorSystem::can_lookup_blackbody(T), ColorSystem::lookup_blackbody_rgb(T), and ColorSystem::compute_blackbody_rgb(T). Removed some casting to uint16_t that was unnecessary.
Removed some test shaders that were not intended to be promoted.
* Added additional test result for black body because the change from double to single precision caused a few results to differ slightly (max delta 0.0000534058)
* Incorporated changes from PR to "fix color conversion from RGB to xyY"
Signed-off-by: Alex M. Wells <alex.m.wells@intel.com>
Alex Wells
15c81df232