[all-commits] [llvm/llvm-project] 3abb8d: [MLIR][XeVM] Add xevm.extf op as the inverse of xe...

[Sang Ik Lee via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3abb8d8a05a215f719cd5ebc962e5f07ffbaeaa1
      https://github.com/llvm/llvm-project/commit/3abb8d8a05a215f719cd5ebc962e5f07ffbaeaa1
  Author: Sang Ik Lee <sang.ik.lee at intel.com>
  Date:   2026-06-12 (Fri, 12 Jun 2026)

  Changed paths:
    M mlir/include/mlir/Dialect/LLVMIR/XeVMOps.td
    M mlir/lib/Conversion/XeGPUToXeVM/XeGPUToXeVM.cpp
    M mlir/lib/Conversion/XeVMToLLVM/XeVMToLLVM.cpp
    M mlir/lib/Dialect/LLVMIR/IR/XeVMDialect.cpp
    A mlir/test/Conversion/XeGPUToXeVM/extf_truncf.mlir
    M mlir/test/Conversion/XeVMToLLVM/xevm_mx-to-llvm.mlir
    M mlir/test/Dialect/LLVMIR/invalid.mlir
    M mlir/test/Dialect/LLVMIR/xevm.mlir
    A mlir/test/Integration/Dialect/XeVM/GPU/xevm_truncf_extf_raw.mlir
    A mlir/test/Integration/Dialect/XeVM/GPU/xevm_truncf_extf_roundtrip.mlir
    A mlir/test/Integration/Dialect/XeVM/GPU/xevm_truncf_extf_roundtrip_bf16.mlir
    A mlir/test/Integration/Dialect/XeVM/GPU/xevm_truncf_extf_roundtrip_fp4.mlir
    A mlir/test/Integration/Dialect/XeVM/GPU/xevm_truncf_extf_roundtrip_fp4_bf16.mlir

  Log Message:
  -----------
  [MLIR][XeVM] Add xevm.extf op as the inverse of xevm.truncf (#203124)

Add a new xevm.extf operation that extends f8/bf8/f4 values to f16/bf16,
mirroring the existing xevm.truncf op, together with its lowering in
XeVMToLLVM.

Lowering details (XeVMToLLVM):

- bf8/f8 -> f16 via __builtin_IB_bf8tohf_16 / __builtin_IB_hf8tohf_16.

- bf8/f8 -> bf16 via f16 -> f32 (convert_float16) -> bf16
(__builtin_IB_ftobf_16).

- e2m1 (fp4) -> f16/bf16 via __builtin_IB_shfl_idx4_lut and
__builtin_IB_shfl_idx4_to_fp16_8_packed (LUT 7 for f16, 5 for bf16).

Adds the op definition and verifier, conversion/roundtrip/invalid unit
tests, and f8 and fp4 GPU round-trip integration tests.

Adds arith.extf to xevm.extf lowering and arith.truncf to xevm.truncf
lowering in XeGPU to XeVM conversion and unit tests.



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