[all-commits] [llvm/llvm-project] 4d1530: RuntimeLibcalls: Split lowering decisions into Lib...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/runtime-libcalls/split-libcall-lowering-info-runtime-libcall-info
  Home:   https://github.com/llvm/llvm-project
  Commit: 4d1530d61354ceccbfd12c3483adcb3fce07a466
      https://github.com/llvm/llvm-project/commit/4d1530d61354ceccbfd12c3483adcb3fce07a466
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-10-24 (Fri, 24 Oct 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/include/llvm/IR/RuntimeLibcalls.h
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    M llvm/lib/IR/RuntimeLibcalls.cpp
    M llvm/lib/LTO/LTO.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
    M llvm/lib/Transforms/Utils/DeclareRuntimeLibcalls.cpp
    M llvm/test/TableGen/RuntimeLibcallEmitter-calling-conv.td
    M llvm/test/TableGen/RuntimeLibcallEmitter-conflict-warning.td
    M llvm/test/TableGen/RuntimeLibcallEmitter.td
    M llvm/test/Transforms/Util/DeclareRuntimeLibcalls/basic.ll
    M llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp

  Log Message:
  -----------
  RuntimeLibcalls: Split lowering decisions into LibcallLoweringInfo

Introduce a new class for the TargetLowering usage. This tracks the
subtarget specific lowering decisions for which libcall to use.
RuntimeLibcallsInfo is a module level property, which may have multiple
implementations of a particular libcall available. This attempts to be
a minimum boilerplate patch to introduce the new concept.

In the future we should have a tablegen way of selecting which
implementations should be used for a subtarget. Currently we
do have some conflicting implementations added, it just happens
to work out that the default cases to prefer is alphabetically
first (plus some of these still are using manual overrides
in TargetLowering constructors).



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