Add compiler support for Intel(r) oneAPI DPC++/C++ Compiler (based on LLVM technology).
Detect if CMAKE_CXX_COMPILER_ID matches "IntelLLVM" and set CMAKE_COMPILER_IS_INTELCLANG=1
NOTE: CMAKE_COMPILER_IS_INTEL will not be set, that is reserved for the classic Intel(r) C++ Compiler.
Define OSL_INTEL_LLVM_COMPILER to hold an encoded Intel(r) LLVM Compiler version
(e.g. 20220000), or 0 if not an Intel(r) LLVM Compiler.
Define OSL_INTEL_CLANG_VERSION to hold the encoded Clang version the
Intel(r) LLVM Compiler is based on (e.g. 140000),
or 0 if not an Intel(r) LLVM compiler.
Ensure OSL_CLANG_VERSION is when its a vanilla clang compiler, not apple or Intel(r) oneAPI DPC++/C++ Compiler.
Added OSL_ANY_CLANG which is set for any clang based compiler.
Removed OSL_NON_CLANG_COMPILER.
Updated uses of OSL_NON_CLANG_COMPILER with more specific and understandable combinations of OSL_ANY_CLANG, OSL_INTEL_CLANG_VERSION, and OSL_INTEL_COMPILER.
Make sure our math calculations are consistent,
especially division. Different compilers may have choose to use
reciprocal division loosing precision causing slightly different
results which can lead to aliasing differences when running the testsuite
Disabled reciprocal division for all projects.
if -ffast-math is enabled to to the underlying compiler, inf's and NaN's may not be handled properly (by design)
When building liboslexec, ensure any source files that require proper INF or NaN handling have additional command line flags passed if needed (as the default behavior maybe -ffast-math):
shadingsys.cpp
wide/wide_shadingsys
wide/wide_optest_float
Enable unitialized Matrix44, because all of its members get overwritten anyway, in impl_transform_normal_masked.
Added alternative test results where needed, wsing '.icx.' as shorthand for the Intel(r) oneAPI DPC++/C++ Compiler in alternative test result filenames.
Changed some tests to use the pretty(value) which clamps values close to 0 to be 0 to avoid lots of different alternative rest result files when using printf.
Added "--center" option to several regression tests to avoid aliasing in results between SIMD batched and scalar execution.
* Added icx-vp2022 to CI plan.
* To better clarify the classic vs. LLVM based Intel compilers and that they have version #'s not just 0 or 1,
renamed OSL_INTEL_COMPILER to OSL_INTEL_CLASSIC_COMPILER_VERSION
renamed OSL_INTEL_LLVM_COMPILER to OSL_INTEL_LLVM_COMPILER_VERSION
Removed unnecessary FMT_VERSION and OPENIMAGEIO_CMAKE_FLAGS from the icx-vp2022 worklow, added back USE_SIMD.
Fix spelling of losing.
Added OSL_OMP_COMPLEX_SIMD_LOOP(...) which is enabled or disabled in platform.h based on which compilers/versions can handle vectorizing complex nested control flow. This makes it cleaner to document which loops need to vectorization conditionally controlled and centralizes where it is managed.
* Removed extra fp-model=consistent for icx-vp2022 workflow
Signed-off-by: Alex M. Wells <alex.m.wells@intel.com>
Alex Wells
2ab1c5e322