[all-commits] [llvm/llvm-project] 824706: [RISCV] Support (truncate (smin (smax X, C1), C2))...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8247068b70106d188d037b9cc4b8de3548108597
      https://github.com/llvm/llvm-project/commit/8247068b70106d188d037b9cc4b8de3548108597
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-05-30 (Thu, 30 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-trunc-sat-clip.ll
    M llvm/test/CodeGen/RISCV/rvv/fpclamptosat_vec.ll
    M llvm/test/CodeGen/RISCV/rvv/trunc-sat-clip-sdnode.ll

  Log Message:
  -----------
  [RISCV] Support (truncate (smin (smax X, C1), C2)) for vnclipu in combineTruncToVnclip. (#93756)

If the smax removed all negative numbers, then we can treat the smin
like a umin.

If the smin and smax are in the other order we can swap them and use a
vnclipu as long as the smax constant is smaller than the smin constant.

This is based on similar code from X86's detectUSatPattern.



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