[PATCH] D111117: [RISCV] Optimize (add (shl x, c0), c1)

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: llvm/lib/Target/RISCV/RISCVISelLowering.cpp:6468
+  int64_t C1 = N1C->getSExtValue();
+  if (C0 <= 1 || isInt<12>(C1) || (C1 >> C0) == 0 || !isInt<12>(C1 >> C0) ||
+      !isInt<12>(C1 - (C1 >> C0 << C0)))
----------------
I think you need to abort if C0 is greater than VT.getSizeInBits() - 1.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D111117/new/

https://reviews.llvm.org/D111117