This commit bulk updates all '.h', '.cl', '.inc', and '.cpp' files to
add any missing license headers.
The remaining files are generally CMake, SOURCES, scripts, markdown,
etc.
There are still some '.ll' files which may benefit from a license
header. I can't find an example of an LLVM IR file with a license header
in the rest of LLVM, but unlike most other (sub)projects, libclc has
examples of LLVM IR as source files, compiled and built into the
library.
This commit bulk-updates the libclc license headers to the current
Apache-2.0 WITH LLVM-exception license in situations where they were
previously attributed to AMD - and occasionally under an additional
single individual contributor - under an MIT license.
AMD signed the LLVM relicensing agreement and so agreed for their past
contributions under the new LLVM license.
The LLVM project also has had a long-standing, unwritten, policy of not
adding copyright notices to source code. This policy was recently
written up [1]. This commit therefore also removes these copyright
notices at the same time.
Note that there are outstanding copyright notices attributed to others -
and many files missing copyright headers - which will be dealt with in
future work.
[1]
https://llvm.org/docs/DeveloperPolicy.html#embedded-copyright-or-contributed-by-statements
The builtins we were using to implement __clc_is(finite|inf|nan|normal)
-- __builtin_isfinite, etc. -- don't take vector types so we were
previously scalarizing. The __builtin_isfpclass builtin does take vector
types and thus allows us to keep things in vectors.
There is no change in codegen to the scalar versions of any of these
builtins.
By using the vector reduction buitins we can avoid scalarization.
Targets that don't support vector reductions will scalarize later on
anyway. The vector reduction builtins should be well-enough supported by
the middle-end to be a generic solution.
This produces conceptually equivalent code: all vector elements are
OR'd/AND'd together and the final scalar is bit-shifted and masked to
produce the final result.
The 'normalize' builtin uses 'all' so its code has similarly improved in
places.
These are similar to 347fb208, but these builtins are expressed in terms
of other builtins. The LLVM IR generated features the same fcmp ord/uno
comparisons as before, but consistently in vector form.
Clang knows how to perform relational operations on OpenCL vectors, so
we don't need to use the Clang builtins. The builtins we were using
didn't support vector types, so we were previously scalarizing.
This commit generates the same LLVM fcmp operations as before, just
without the scalarization.
The half variants were missing. The integer bitselect builtins weren't
going through __clc_bitselect due to an oversight when the CLC version
was introduced.
This was missed during the introduction of select. This also unifies the
various .inc files used for each, as they were essentially identical.
The __clc_select function is now also built for SPIR-V targets.
The OpenCL relational functions now call their CLC counterparts, and the
CLC relational functions are defined identically to how the OpenCL
functions were defined.
As usual, clspv and spir-v targets bypass these.
No observable changes to any libclc target (measured with llvm-diff).
