[all-commits] [llvm/llvm-project] d226dc: [NVPTX] Fix illegal combineInsertEltToShuffle patt...

[Srinivasa Ravi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d226dcc019d6a83cba79951ec2a8a08c53a57858
      https://github.com/llvm/llvm-project/commit/d226dcc019d6a83cba79951ec2a8a08c53a57858
  Author: Srinivasa Ravi <srinivasar at nvidia.com>
  Date:   2026-06-04 (Thu, 04 Jun 2026)

  Changed paths:
    M llvm/lib/Target/NVPTX/NVPTXISelLowering.h
    A llvm/test/CodeGen/NVPTX/insert-vector-elt-bitcast-legalize.ll

  Log Message:
  -----------
  [NVPTX] Fix illegal combineInsertEltToShuffle pattern (#198259)

Adds a condition to the `isShuffleMaskLegal` method to prevent
`combineInsertEltToShuffle` from creating an illegal `vector_shuffle`
after type legalization which leads to a crash.

Context:
This is triggered when bitcasting a `v2f16` into a vector that type
legalizes to a `v2i32`. This happens on architectures supporting packed
`f32` operations (>= `sm_100`). In certain cases, this leads to
`combineInsertEltToShuffle` creating a vector shuffle with `v4f16` for
simplification. Since this happens after type legalization and `v4f16`
is an illegal type, it leads to a crash.



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