8000 Plumb scaling_mfma through to IREE · Issue #20701 · iree-org/iree · GitHub
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Plumb scaling_mfma through to IREE #20701

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krzysz00 opened this issue May 1, 2025 · 0 comments
Open

Plumb scaling_mfma through to IREE #20701

krzysz00 opened this issue May 1, 2025 · 0 comments

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@krzysz00
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krzysz00 commented May 1, 2025

Once we have amdgpu.scaling_mfma landed in IREE,

  1. Define some sort of MMA kind attribute (or extend the existing ones) to represent these scaled MFMAs, which take a 32x[small float] and an i8 (really, a vector<4xi8> and a selector for if you do your own unrolling) scale. There's a 16x16x128 and 32x32x64 version of the intrinsic and any combination from {f4E2M1FN, f6E2M3FN, f6E3M2FN, f8E4M3FN, f8E5M2}^2` work as input element types. These intrinsics follow the usual MFMA layout
  2. Have some rewrite from a linalg representation of such a scaled MFMA into the relevant iree_gpu.multi_mma.
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