[all-commits] [llvm/llvm-project] 0919ab: [AArch64] Don't try to vectorize fixed point to fp...

[Pranav Kant via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0919ab3cb64668d771540c83fe439da8796b9ada
      https://github.com/llvm/llvm-project/commit/0919ab3cb64668d771540c83fe439da8796b9ada
  Author: Pranav Kant <prka at google.com>
  Date:   2025-03-25 (Tue, 25 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/aarch64-neon-vector-insert-uaddlv.ll
    M llvm/test/CodeGen/AArch64/arm64-convert-v4f64.ll
    M llvm/test/CodeGen/AArch64/bf16-v4-instructions.ll
    M llvm/test/CodeGen/AArch64/bf16-v8-instructions.ll
    M llvm/test/CodeGen/AArch64/complex-int-to-fp.ll
    M llvm/test/CodeGen/AArch64/fold-int-pow2-with-fmul-or-fdiv.ll
    M llvm/test/CodeGen/AArch64/fp-intrinsics-vector.ll
    M llvm/test/CodeGen/AArch64/fprcvt-cvtf.ll
    M llvm/test/CodeGen/AArch64/itofp-bf16.ll
    M llvm/test/CodeGen/AArch64/itofp.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-int-to-fp.ll
    M llvm/test/CodeGen/AArch64/vector-fcvt.ll

  Log Message:
  -----------
  [AArch64] Don't try to vectorize fixed point to fp narrowing conversion (#130665)

GCC, correctly, doesn't vectorize in this case. Absence of direct
instructions to convert larger fixed point to lower floating point
precision inadvertently causes rounding leading to subtle differences
across ISAs.

https://godbolt.org/z/ssEchMWrE

Co-authored by: @echristo



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