[Downstream Change] `sincos()` vectorization

[MacDue]

This issue tracks the downstream changes needed to enable sincos() vectorization in the Arm toolchain. These changes are only for the release 20.x branch (https://github.com/arm/arm-toolchain/tree/release/arm-software/20.x) as we intend to complete up-streaming the changes for LLVM 21.

• (release 20.x non-upstream patch) [LV] Add initial support for vectorizing literal struct return values #82
  • (Merged) Upstream PR: [LV] Add initial support for vectorizing literal struct return values llvm/llvm-project#109833
• (release 20.x non-upstream patch) [clang] Lower non-builtin sincos[f|l] calls to llvm.sincos.* when -fno-math-errno is set #83
  • (Merged) Upstream PR: [clang] Lower non-builtin sincos[f|l] calls to llvm.sincos.* when -fno-math-errno is set llvm/llvm-project#121763
• (release 20.x non-upstream patch) [LV] Teach the vectorizer to cost and vectorize llvm.sincos intrinsics #84
  • (Merged) Upstream PR: [CostModel] Handle vector struct results and cost llvm.sincos llvm/llvm-project#123210
  • Behavior change: sincos() becomes vectorizable with -fveclib=ArmPL/SLEEF
• [Downstream change][TargetParser] Parse Amazon Linux triple and handle RuntimeLibcalls #286
  • Allows vectorization of sincos on aarch64-amazon-linux triple

The patches were not possible to upstream for LLVM 20 due to long review times.

[kiranchandramohan]

Can you also provide links to the llvm-project main branch patches? Have these landed or are they in review?

[MacDue]

Can you also provide links to the llvm-project main branch patches? Have these landed or are they in review?

Added the upstream PR links (above). The upstream patches have not landed.

[MacDue]

Update: All patches have landed upstream (so should be available in the 21.x release without any downstream changes).