Farzon Lotfi 2f0308ed02 [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

2024-06-07 09:42:06 -04:00

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