[all-commits] [llvm/llvm-project] 6a6c52: [X86][FP16] Combine two steps conversions into dir...

[Phoebe Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6a6c527ee287a4a7787fb5c519014c2e22f718c3
      https://github.com/llvm/llvm-project/commit/6a6c527ee287a4a7787fb5c519014c2e22f718c3
  Author: Phoebe Wang <phoebe.wang at intel.com>
  Date:   2023-02-13 (Mon, 13 Feb 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512fp16-cvt.ll
    M llvm/test/CodeGen/X86/vec-strict-inttofp-256-fp16.ll

  Log Message:
  -----------
  [X86][FP16] Combine two steps conversions into direct conversion

When both v8i64 and v4f16 are not legal in a v8i64->v8f16 conversion, legalizer will breaks it into v8i64->v4i64->v4f32->v8f32->v8f16.

Given we support v4i64->v8f16, we can combine them with a shuffle instruction.

Reviewed By: LuoYuanke

Differential Revision: https://reviews.llvm.org/D143872