Pass disabled since approximately D104962 for miscompiling openmp
The functions under ReplaceConstant miscompile phis as noted in D112717 and
have no users in tree other than the disabled pass. It seems likely it has no
users out of tree.
Deletes the test cases associated with the disabled pass as well.
Reviewed By: rampitec
Differential Revision: https://reviews.llvm.org/D147586
The premise here is to allow non-kernel functions to locate external LDS variables without using LDS or extra magic SGPRs to do so.
1/ First it crawls the callgraph to work out which external LDS variables are reachable from a given kernel
2/ Then it creates a new `extern char[0]` variable for each kernel, which will alias all the other extern LDS variables because that's the documented behaviour of these variables
3/ The address of that variable is written to a lookup table. The global variable is tagged with metadata to track what address it was allocated at by codegen
4/ The assembler builds the lookup table using the metadata
5/ Any non-kernel functions use the same magic intrinsic used by table lookups of non-dynamic LDS variables to find the address to use
Heavy overlap with the code paths taken for other lowering, in particular the same intrinsic is used to pass the dynamic scope information through the same sgpr as for table lookups of static LDS.
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D144233
Bug noted in D112717 can be sidestepped with this change.
Expanding all ConstantExpr involved with LDS up front makes the variable specialisation simpler. Excludes ConstantExpr that don't access LDS to avoid disturbing codegen elsewhere.
Reviewed By: rampitec
Differential Revision: https://reviews.llvm.org/D133422
Use same MSSA clobbering checks as in the AMDGPUAnnotateUniformValues.
Kernel argument promotion needs exactly the same information so factor
out utility function isClobberedInFunction.
Differential Revision: https://reviews.llvm.org/D119480
