[all-commits] [llvm/llvm-project] ac6e1f: [RISCV][TTI] Cost non-power-of-two size changing c...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ac6e1fd0c089043fe60bd0040ba3cad884f00206
      https://github.com/llvm/llvm-project/commit/ac6e1fd0c089043fe60bd0040ba3cad884f00206
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

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

  Log Message:
  -----------
  [RISCV][TTI] Cost non-power-of-two size changing casts (#101047)

For a cast with src and destination size being unequal, we were costing
the cast as if it were being scalarized, when in fact we can often
promote such cases to a wider legal type.

Note that for casts with equal size (i.e. bitcast, some fp<->i, and
ptrtoint) the generic logic in BasicTTI already assumed promotion. It
just doesn't handle the cast where source and destination are both
promoted to non-equal types.

This is analogous to d3fd28a, but with the same reasoning applied to
casts instead.



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