[all-commits] [llvm/llvm-project] 3073c3: [SDAG] Avoid creating redundant stack slots when l...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3073c3c2290a6d9b12fbaefa40dd22eef6312895
      https://github.com/llvm/llvm-project/commit/3073c3c2290a6d9b12fbaefa40dd22eef6312895
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2024-09-24 (Tue, 24 Sep 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/RuntimeLibcallUtil.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    A llvm/test/CodeGen/AArch64/sincos-stack-slots.ll

  Log Message:
  -----------
  [SDAG] Avoid creating redundant stack slots when lowering FSINCOS (#108401)

When lowering `FSINCOS` to a library call (that takes output pointers)
we can avoid creating new stack allocations if the results of the
`FSINCOS` are being stored. Instead, we can take the destination
pointers from the stores and pass those to the library call.

---

Note: As a NFC this also adds (and uses) `RTLIB::getFSINCOS()`.



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