[all-commits] [llvm/llvm-project] eb9bc0: [RISCV] Fix crash when unrolling loop containing v...

[Shih-Po Hung via All-commits]

  Branch: refs/heads/release/18.x
  Home:   https://github.com/llvm/llvm-project
  Commit: eb9bc02b06cb07ffdd4c5ee55d6b6b591d78656f
      https://github.com/llvm/llvm-project/commit/eb9bc02b06cb07ffdd4c5ee55d6b6b591d78656f
  Author: Shih-Po Hung <shihpo.hung at sifive.com>
  Date:   2024-03-12 (Tue, 12 Mar 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    A llvm/test/Analysis/CostModel/RISCV/vector-cost-without-v.ll

  Log Message:
  -----------
  [RISCV] Fix crash when unrolling loop containing vector instructions (#83384)

When MVT is not a vector type, TCK_CodeSize should return an invalid
cost. This patch adds a check in the beginning to make sure all cost
kinds return invalid costs consistently.

Before this patch, TCK_CodeSize returns a valid cost on scalar MVT but
other cost kinds doesn't.

This fixes the issue #83294 where a loop contains vector instructions
and MVT is scalar after type legalization when the vector extension is
not enabled,

(cherry picked from commit fb67dce1cb87e279593c27bd4122fe63bad75f04)



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