[all-commits] [llvm/llvm-project] a56885: [Hexagon] Drop artificial VF sub-registers from W0...

[Ikhlas Ajbar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a56885a9dcd578f9633132e9aa8420e0f7504569
      https://github.com/llvm/llvm-project/commit/a56885a9dcd578f9633132e9aa8420e0f7504569
  Author: Ikhlas Ajbar <iajbar at quicinc.com>
  Date:   2026-07-08 (Wed, 08 Jul 2026)

  Changed paths:
    M llvm/lib/Target/Hexagon/HexagonRegisterInfo.td
    A llvm/test/CodeGen/Hexagon/pr183850.ll

  Log Message:
  -----------
  [Hexagon] Drop artificial VF sub-registers from W0-W15 (PR183850) (#208260)

Declaring VF0-VF15 as an artificial (vsub_fake) third sub-register of
W0-W15 caused MachineCopyPropagation to associate DBG_VALUEs of $wN with
unrelated $vM COPYs via reg-unit overlap, tripping the
hasDebugOperandForReg assertion in updateDbgUsersToReg.

Remove the fake sub-register from W0-W15. The reverse-alias WR0-WR15
keep vsub_fake intentionally.



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