[all-commits] [llvm/llvm-project] 4bf97a: [IR] Add `llvm.modf` intrinsic (#121948)

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4bf97aa818965d86055c762a42f6d518e8e3a21e
      https://github.com/llvm/llvm-project/commit/4bf97aa818965d86055c762a42f6d518e8e3a21e
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2025-02-07 (Fri, 07 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.modf.ll
    A llvm/test/CodeGen/AArch64/veclib-llvm.modf.ll

  Log Message:
  -----------
  [IR] Add `llvm.modf` intrinsic (#121948)

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

The `llvm.modf` intrinsic takes a floating-point value and returns both
the integral and fractional parts (as a struct).

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

This corresponds to the libm `modf` function but returns multiple values
in a struct (rather than take output pointers), which makes it easier to
vectorize.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications