[PATCH] D120192: [DAG] Attempt to fold bswap(shl(x,c)) -> zext(bswap(trunc(shl(x,c-bw/2))))

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:9602
+      if (uint64_t NewShAmt = (ShAmt->getZExtValue() - (BW / 2))) {
+        EVT ShiftAmtVT = N0.getOperand(1).getValueType();
+        Res = DAG.getNode(ISD::SHL, DL, VT, Res,
----------------
Should we go through getShiftAmountTy?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D120192/new/

https://reviews.llvm.org/D120192