[all-commits] [llvm/llvm-project] 5315e0: [SystemZ] Limit depth of findCCUse() (#185922)

[Nikita Popov via All-commits]

  Branch: refs/heads/release/22.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 5315e0b2f0b5902e4086ba9d32e768d8641a43b2
      https://github.com/llvm/llvm-project/commit/5315e0b2f0b5902e4086ba9d32e768d8641a43b2
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2026-03-12 (Thu, 12 Mar 2026)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

  Log Message:
  -----------
  [SystemZ] Limit depth of findCCUse() (#185922)

The recursion here has potentially exponential complexity. Avoid this by
limiting the depth of recursion.

An alternative would be to memoize the results. I went with the simpler
depth limit on the assumption that we don't particularly care about very
deep value chains here.

Fixes https://github.com/llvm/llvm-project/issues/185905.

(cherry picked from commit 11e0d6ae4b00114d642f03168f57a007464bf5f6)



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