[llvm] [RISCV] Select and/or/xor with certain constants to Zbb ANDN/ORN/XNOR (PR #120221)

[Craig Topper via llvm-commits]

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@@ -3236,6 +3236,35 @@ bool RISCVDAGToDAGISel::selectSHXADD_UWOp(SDValue N, unsigned ShAmt,
   return false;
 }
 
+bool RISCVDAGToDAGISel::selectInvLogicImm(SDValue N, SDValue &Val) {
+  if (!isa<ConstantSDNode>(N))
+    return false;
+
+  int64_t Imm = cast<ConstantSDNode>(N)->getSExtValue();
+  if ((Imm & 0xfff) != 0xfff || Imm == -1)
+    return false;
+
+  for (const SDNode *U : N->uses()) {
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topperc wrote:

This needs to change `N->users()` now.

https://github.com/llvm/llvm-project/pull/120221