Use SDPatternMatching and remove truncate

Author: badumbatish

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp

@@ -24,6 +24,7 @@
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/SDPatternMatch.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
 #include "llvm/IR/DiagnosticInfo.h"
@@ -35,9 +36,10 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/KnownBits.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
-
+using namespace llvm::SDPatternMatch;
 #define DEBUG_TYPE "wasm-lower"
 
 WebAssemblyTargetLowering::WebAssemblyTargetLowering(
@@ -3248,29 +3250,24 @@ static SDValue performAnyTrueCombine(SDNode *N, SelectionDAG &DAG) {
   if (N->getConstantOperandVal(0) != Intrinsic::wasm_anytrue)
     return SDValue();
 
-  SDValue SetCC = N->getOperand(1);
-  if (SetCC.getOpcode() != ISD::SETCC)
+  SDValue LHS;
+  if (!sd_match(N->getOperand(1), m_c_SetCC(m_Value(LHS), m_Zero(),
+                                            m_SpecificCondCode(ISD::SETEQ))))
     return SDValue();
 
-  SDValue LHS = SetCC->getOperand(0);
-  SDValue RHS = SetCC->getOperand(1);
-  ISD::CondCode Cond = cast<CondCodeSDNode>(SetCC->getOperand(2))->get();
   EVT LT = LHS.getValueType();
   unsigned NumElts = LT.getVectorNumElements();
-  if (NumElts != 2 && NumElts != 4 && NumElts != 8 && NumElts != 16)
+  if (LT.getScalarSizeInBits() > 128 / NumElts)
     return SDValue();
 
   EVT Width = MVT::getIntegerVT(128 / NumElts);
 
-  if (!isNullOrNullSplat(RHS) || Cond != ISD::SETEQ)
-    return SDValue();
-
   SDValue Ret = DAG.getZExtOrTrunc(
       DAG.getNode(
           ISD::INTRINSIC_WO_CHAIN, DL, MVT::i32,
-          {DAG.getConstant(Intrinsic::wasm_alltrue, DL, MVT::i32),
-           DAG.getSExtOrTrunc(LHS, DL, LT.changeVectorElementType(Width))}),
+          {DAG.getConstant(Intrinsic::wasm_alltrue, DL, MVT::i32), LHS}),
       DL, MVT::i1);
+
   Ret = DAG.getNOT(DL, Ret, MVT::i1);
   return DAG.getZExtOrTrunc(Ret, DL, N->getValueType(0));
 }
@@ -3437,7 +3434,7 @@ WebAssemblyTargetLowering::PerformDAGCombine(SDNode *N,
   case ISD::TRUNCATE:
     return performTruncateCombine(N, DCI);
   case ISD::INTRINSIC_WO_CHAIN: {
-    if (auto AnyTrueCombine = performAnyTrueCombine(N, DCI.DAG))
+    if (SDValue AnyTrueCombine = performAnyTrueCombine(N, DCI.DAG))
       return AnyTrueCombine;
     return performLowerPartialReduction(N, DCI.DAG);
   }