[all-commits] [llvm/llvm-project] 7a4e56: [RISCV] Add an early out to lowerVECTOR_SHUFFLEAsV...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a4e56acac4fa398880411282f6280d61533204b
      https://github.com/llvm/llvm-project/commit/7a4e56acac4fa398880411282f6280d61533204b
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-10-18 (Tue, 18 Oct 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp

  Log Message:
  -----------
  [RISCV] Add an early out to lowerVECTOR_SHUFFLEAsVSlidedown. NFC

If Mask[0] is 0, then we're never going to match a slidedown. If
we get through the for loop, then it's an identity mask which should
have already been optimized out. Otherwise it's some non-contiguous
mask that will fail out of the lop. Might as well not bother entering
the loop.