Limit fp srcmods on integers to select/v_cndmask

Author: chrisjbris

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

@@ -3036,12 +3036,15 @@ bool AMDGPUDAGToDAGISel::SelectVOP3ModsImpl(SDValue In, SDValue &Src,
     Src = Src.getOperand(0);
   }
 
-  // Convert various sign-bit masks to src mods. Currently disabled for 16-bit
-  // types as the codegen replaces the operand without adding a srcmod.
-  // This is intentionally finding the cases where we are performing float neg
-  // and abs on int types, the goal is not to obtain two's complement neg or
-  // abs.
+  // Convert various sign-bit masks on integers to src mods. Currently disabled
+  // for 16-bit types as the codegen replaces the operand without adding a
+  // srcmod. This is intentionally finding the cases where we are performing
+  // float neg and abs on int types, the goal is not to obtain two's complement
+  // neg or abs. Hence, this is non-canonicalizing.
   // TODO: Add 16-bit support.
+  if (IsCanonicalizing)
+    return true;
+
   unsigned Opc = Src->getOpcode();
   EVT VT = Src.getValueType();
   if ((Opc != ISD::AND && Opc != ISD::OR && Opc != ISD::XOR) ||