bb3f5e1fed
Following discussions in #110443, and the following earlier discussions in https://lists.llvm.org/pipermail/llvm-dev/2017-October/117907.html, https://reviews.llvm.org/D38482, https://reviews.llvm.org/D38489, this PR attempts to overhaul the `TargetMachine` and `LLVMTargetMachine` interface classes. More specifically: 1. Makes `TargetMachine` the only class implemented under `TargetMachine.h` in the `Target` library. 2. `TargetMachine` contains target-specific interface functions that relate to IR/CodeGen/MC constructs, whereas before (at least on paper) it was supposed to have only IR/MC constructs. Any Target that doesn't want to use the independent code generator simply does not implement them, and returns either `false` or `nullptr`. 3. Renames `LLVMTargetMachine` to `CodeGenCommonTMImpl`. This renaming aims to make the purpose of `LLVMTargetMachine` clearer. Its interface was moved under the CodeGen library, to further emphasis its usage in Targets that use CodeGen directly. 4. Makes `TargetMachine` the only interface used across LLVM and its projects. With these changes, `CodeGenCommonTMImpl` is simply a set of shared function implementations of `TargetMachine`, and CodeGen users don't need to static cast to `LLVMTargetMachine` every time they need a CodeGen-specific feature of the `TargetMachine`. 5. More importantly, does not change any requirements regarding library linking. cc @arsenm @aeubanks
The LLVM/Offload Subproject
The Offload subproject aims at providing tooling, runtimes, and APIs that allow users to execute code on accelerators or other "co-processors" that may or may not match the architecture of their "host". In the long run, all kinds of targets are in scope of this effort, including but not limited to: CPUs, GPUs, FPGAs, AI/ML accelerators, distributed resources, etc.
The project is just starting and the design is still not ironed out. More content will show up here and on our webpage soon. In the meantime people are encouraged to participate in our meetings (see below) and check our development board as well as the discussions on Discourse.
Meetings
Every second Wednesday, 7:00 - 8:00am PT, starting Jan 24, 2024. Alternates with the OpenMP in LLVM meeting. invite.ics Meeting Minutes and Agenda