IR produced using TableGen builtin function declarations
(`fdeclare-opencl-builtins.cl`) did not have the target's calling
convention applied to builtin calls.
Fix this, and update the codegen test to check that IR produced using
opencl-c.h and `-fdeclare-opencl-builtins` is identical with respect
to the builtin calls.
Differential Revision: https://reviews.llvm.org/D98039
`mix` is subtly different from `clamp`: in the overloads where the
last argument is a scalar, the second argument should be a gentype for
`mix`.
As scalars can be implicitly converted to vectors, this cannot be
caught in the Sema test. Hence adding a CodeGen test, where we can
verify the types using the mangled name.
Commit 9a8d477a0e ("[OpenCL] Add builtin function attribute
handling", 2019-11-05) stopped Clang from mangling single-overload
builtins, which is incorrect.
Add handling for the "pure", "const" and "convergent" function
attributes for OpenCL builtin functions.
Patch by Pierre Gondois and Sven van Haastregt.
Differential Revision: https://reviews.llvm.org/D64319
Sven van Haastregt