[all-commits] [llvm/llvm-project] fd2480: Reapply [mlir][xegpu] Add XeGPU subgroup map propa...

[Charitha Saumya via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd24805c8e67c921991e82463bdc23563caf744e
      https://github.com/llvm/llvm-project/commit/fd24805c8e67c921991e82463bdc23563caf744e
  Author: Charitha Saumya <136391709+charithaintc at users.noreply.github.com>
  Date:   2025-03-14 (Fri, 14 Mar 2025)

  Changed paths:
    M mlir/include/mlir/Dialect/XeGPU/Transforms/Passes.td
    M mlir/lib/Dialect/XeGPU/Transforms/CMakeLists.txt
    A mlir/lib/Dialect/XeGPU/Transforms/XeGPUSubgroupDistribute.cpp
    A mlir/test/Dialect/XeGPU/subgroup-map-propagation.mlir

  Log Message:
  -----------
  Reapply [mlir][xegpu] Add XeGPU subgroup map propagation analysis for XeGPU SIMT distribution.  (#131380)

Originally introduced in #130240 and reverted in #131364 

Reproduced the issue locally in Linux by doing a shared lib build. Fixes
including adding the missing LINK_LIBS.

**Original commit message:**

This PR adds the SG map propagation step of the XeGPU SIMT distribution.
SG map propagation is a sparse backward dataflow analysis that propagate
the sg_map backward starting from the operands of certain operations
(DPAS, store etc.).

This is the first step of XeGPU subgroup distribution. This analysis
result is used to attach layout information to each XeGPU SIMD subgroup
op. The lowering patterns in XeGPUSubgroupDistribute will consume these
layout info to distribute SIMD ops into SIMT ops that work on work-item
level data fragments.

Summary of Lowering XeGPU SIMD -> SIMT
Subgroup map propagation (This PR)
Attach sg_map to each op in move all ops inside
gpu.warp_execute_on_lane0 region.
Distribute each op using sg_map
Additional legalization steps to align more with Xe HW.



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