[all-commits] [llvm/llvm-project] 701223: [IR] Add llvm.sincospi intrinsic (#125873)

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 701223ac20a45d23b9b01c8a514294eb16219d79
      https://github.com/llvm/llvm-project/commit/701223ac20a45d23b9b01c8a514294eb16219d79
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2025-02-11 (Tue, 11 Feb 2025)

  Changed paths:
    M llvm/docs/LangRef.rst
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/include/llvm/CodeGen/ISDOpcodes.h
    M llvm/include/llvm/CodeGen/RuntimeLibcallUtil.h
    M llvm/include/llvm/IR/Intrinsics.td
    M llvm/include/llvm/IR/RuntimeLibcalls.def
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    A llvm/test/CodeGen/AArch64/llvm.sincospi.ll
    A llvm/test/CodeGen/AArch64/veclib-llvm.sincospi.ll

  Log Message:
  -----------
  [IR] Add llvm.sincospi intrinsic (#125873)

This adds the `llvm.sincospi` intrinsic, legalization, and lowering
(mostly reusing the lowering for sincos and frexp).

The `llvm.sincospi` intrinsic takes a floating-point value and returns
both the sine and cosine of the value multiplied by pi. It computes the
result more accurately than the naive approach of doing the
multiplication ahead of time, especially for large input values.

```
declare { float, float }          @llvm.sincospi.f32(float  %Val)
declare { double, double }        @llvm.sincospi.f64(double %Val)
declare { x86_fp80, x86_fp80 }    @llvm.sincospi.f80(x86_fp80  %Val)
declare { fp128, fp128 }          @llvm.sincospi.f128(fp128 %Val)
declare { ppc_fp128, ppc_fp128 }  @llvm.sincospi.ppcf128(ppc_fp128  %Val)
declare { <4 x float>, <4 x float> } @llvm.sincospi.v4f32(<4 x float>  %Val)
```

Currently, the default lowering of this intrinsic relies on the
`sincospi[f|l]` functions being available in the target's runtime (e.g.
libc).



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