Fix emission of move immediate for ARM integrated assembler.

src/IceInstARM32.cpp

 //===- subzero/src/IceInstARM32.cpp - ARM32 instruction implementation ----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 574 matching lines @@
     const char *NoWidthString = "";
     const char *WidthString =
         isVectorType(Src0->getType()) ? ".64" : NoWidthString;
     Str << "\t" << ActualOpcode << getPredicate() << WidthString << "\t";
     Src0->emit(Func);
     Str << ", ";
     Dest->emit(Func);
   }
 }
 
+void InstARM32Mov::emitIASSingleDestSingleSource(const Cfg *Func) const {
+  ARM32::AssemblerARM32 *Asm = Func->getAssembler<ARM32::AssemblerARM32>();
+  Variable *Dest = getDest();
+  Operand *Src0 = getSrc(0);
+  // Note: Loop is used so that we can short circuit using break.
+  do {
+    if (Dest->hasReg()) {
+      Type DestTy = Dest->getType();
+      const bool DestIsVector = isVectorType(DestTy);
+      const bool DestIsScalarFP = isScalarFloatingType(DestTy);
+      const bool CoreVFPMove = isMoveBetweenCoreAndVFPRegisters(Dest, Src0);
+      if (DestIsVector || DestIsScalarFP || CoreVFPMove)
+        break;
+      if (const auto *FlexImm = llvm::dyn_cast<OperandARM32FlexImm>(Src0)) {
+        Asm->mov(static_cast<RegARM32::GPRRegister>(Dest->getRegNum()),
+                 *FlexImm, getPredicate());
+        return;
+      }
+    }
+  } while (0);
+  llvm_unreachable("not yet implemented");
+}
+
 void InstARM32Mov::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   assert(!(isMultiDest() && isMultiSource()) && "Invalid vmov type.");
   if (isMultiDest()) {
     emitMultiDestSingleSource(Func);
     return;
   }
 
   if (isMultiSource()) {
     emitSingleDestMultiSource(Func);
     return;
   }
 
   emitSingleDestSingleSource(Func);
 }
 
 void InstARM32Mov::emitIAS(const Cfg *Func) const {
   assert(getSrcSize() == 1);
   (void)Func;
-  llvm_unreachable("Not yet implemented");
+  assert(!(isMultiDest() && isMultiSource()) && "Invalid vmov type.");
+  if (isMultiDest())
+    llvm_unreachable("Not yet implemented");
+  if (isMultiSource())
+    llvm_unreachable("Not yet implemented");
+  // Must be single source/dest.
+  emitIASSingleDestSingleSource(Func);
 }
 
 void InstARM32Mov::dump(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   assert(getSrcSize() == 1 || getSrcSize() == 2);
   Ostream &Str = Func->getContext()->getStrDump();
   Variable *Dest = getDest();
   Variable *DestHi = getDestHi();
   Dest->dump(Func);
@@ skipping 762 matching lines @@
   if (getShiftOp() != kNoShift) {
     Str << ", " << InstARM32ShiftAttributes[getShiftOp()].EmitString << " ";
     if (Func)
       getShiftAmt()->dump(Func);
     else
       getShiftAmt()->dump(Str);
   }
 }
 
 } // end of namespace Ice