[all-commits] [llvm/llvm-project] 424b87: [RISCV][TTI] Use legalized element types when cost...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 424b87b8d6f0fab0898cb5cfdf9b1bbf06ddee03
      https://github.com/llvm/llvm-project/commit/424b87b8d6f0fab0898cb5cfdf9b1bbf06ddee03
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-08-22 (Thu, 22 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/cast.ll

  Log Message:
  -----------
  [RISCV][TTI] Use legalized element types when costing casts (#105723)

This fixes a crash introduced by my
ac6e1fd0c089043fe60bd0040ba3cad884f00206.

I had failed to consider the case where a vector is truncated to an
illegal element type. The resulting intermediate VT wasn't an MVT and
we'd fail an assertion. Surprisingly, SLP does query illegal element
types in some cases.



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