[all-commits] [llvm/llvm-project] 2f0308: [arm64] Add tan intrinsic lowering (#94545)

[Farzon Lotfi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2f0308ed02ea622b8228d271d9aebe4bd4deacdd
      https://github.com/llvm/llvm-project/commit/2f0308ed02ea622b8228d271d9aebe4bd4deacdd
  Author: Farzon Lotfi <1802579+farzonl at users.noreply.github.com>
  Date:   2024-06-07 (Fri, 07 Jun 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/VecFuncs.def
    M llvm/lib/Target/AArch64/AArch64FastISel.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
    A llvm/test/CodeGen/AArch64/GlobalISel/legalize-tan.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
    M llvm/test/CodeGen/AArch64/f16-instructions.ll
    M llvm/test/CodeGen/AArch64/fast-isel-runtime-libcall.ll
    M llvm/test/CodeGen/AArch64/illegal-float-ops.ll
    M llvm/test/CodeGen/AArch64/replace-with-veclib-armpl.ll
    M llvm/test/CodeGen/AArch64/replace-with-veclib-sleef-scalable.ll
    M llvm/test/CodeGen/AArch64/replace-with-veclib-sleef.ll
    M llvm/test/CodeGen/AArch64/vec-libcalls.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/veclib-calls-libsystem-darwin.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/veclib-intrinsic-calls.ll

  Log Message:
  -----------
  [arm64] Add tan intrinsic lowering (#94545)

This change is an implementation of
https://github.com/llvm/llvm-project/issues/87367's investigation on
supporting IEEE math operations as intrinsics.
Which was discussed in this RFC:
https://discourse.llvm.org/t/rfc-all-the-math-intrinsics/78294

This PR is just for Tan.

Now that x86 tan backend landed:
https://github.com/llvm/llvm-project/pull/90503 we can add other
backends since the shared pieces are in tree now.

Changes:
- `llvm/include/llvm/Analysis/VecFuncs.def` - vectorization of tan for
arm64 backends.
- `llvm/lib/Target/AArch64/AArch64FastISel.cpp` - Add tan to the libcall
table
- `llvm/lib/Target/AArch64/AArch64ISelLowering.cpp` - Add tan expansion
for f128, f16, and vector\neon operations
- `llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp` define
`G_FTAN` as a legal arm64 instruction

resolves #94755



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