From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 8 Jun 2021 16:08:14 +0000 (+0100)
Subject: PPCISelLowering.cpp - don't dereference a dyn_cast<>.
X-Git-Tag: llvmorg-14-init~4552
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=01b77159e30b38613ab700d8bb128b006822c58c;p=platform%2Fupstream%2Fllvm.git

PPCISelLowering.cpp - don't dereference a dyn_cast<>.

dyn_cast<> can return nullptr which we would then dereference - use cast<> which will assert that the type is correct.
---

diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index aefa48d..013ce0c 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -13925,7 +13925,7 @@ static SDValue combineBVZEXTLOAD(SDNode *N, SelectionDAG &DAG) {
   if (Operand.getOpcode() != ISD::LOAD)
     return SDValue();
 
-  LoadSDNode *LD = dyn_cast<LoadSDNode>(Operand);
+  auto *LD = cast<LoadSDNode>(Operand);
   EVT MemoryType = LD->getMemoryVT();
 
   // This transformation is only valid if the we are loading either a byte,
@@ -16571,9 +16571,7 @@ static SDValue combineADDToADDZE(SDNode *N, SelectionDAG &DAG,
   SDVTList VTs = DAG.getVTList(MVT::i64, MVT::Glue);
   SDValue Cmp = RHS.getOperand(0);
   SDValue Z = Cmp.getOperand(0);
-  auto *Constant = dyn_cast<ConstantSDNode>(Cmp.getOperand(1));
-
-  assert(Constant && "Constant Should not be a null pointer.");
+  auto *Constant = cast<ConstantSDNode>(Cmp.getOperand(1));
   int64_t NegConstant = 0 - Constant->getSExtValue();
 
   switch(cast<CondCodeSDNode>(Cmp.getOperand(2))->get()) {
@@ -17285,8 +17283,7 @@ PPC::AddrMode PPCTargetLowering::SelectOptimalAddrMode(const SDNode *Parent,
     if (Flags & PPC::MOF_RPlusSImm16) {
       SDValue Op0 = N.getOperand(0);
       SDValue Op1 = N.getOperand(1);
-      ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Op1);
-      int16_t Imm = CN->getAPIntValue().getZExtValue();
+      int16_t Imm = cast<ConstantSDNode>(Op1)->getAPIntValue().getZExtValue();
       if (!Align || isAligned(*Align, Imm)) {
         Disp = DAG.getTargetConstant(Imm, DL, N.getValueType());
         Base = Op0;
@@ -17312,7 +17309,7 @@ PPC::AddrMode PPCTargetLowering::SelectOptimalAddrMode(const SDNode *Parent,
     // zero or load-immediate-shifted and the displacement will be
     // the low 16 bits of the address.
     else if (Flags & PPC::MOF_AddrIsSImm32) {
-      ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
+      auto *CN = cast<ConstantSDNode>(N);
       EVT CNType = CN->getValueType(0);
       uint64_t CNImm = CN->getZExtValue();
       // If this address fits entirely in a 16-bit sext immediate field, codegen