Subzero: x86-64: Allow immediates in 64-bit instructions.

src/IceAssemblerX86BaseImpl.h

 //===- subzero/src/IceAssemblerX86BaseImpl.h - base x86 assembler -*- C++ -*-=//
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 //===----------------------------------------------------------------------===//
 //
 //                        The Subzero Code Generator
@@ skipping 277 matching lines @@
     emitUint8(0x88);
   } else {
     emitUint8(0x89);
   }
   emitOperand(gprEncoding(src), dst);
 }
 
 template <typename TraitsType>
 void AssemblerX86Base<TraitsType>::mov(Type Ty, const Address &dst,
                                        const Immediate &imm) {
-  assert(Ty != IceType_i64 && "i64 not supported yet.");
   AssemblerBuffer::EnsureCapacity ensured(&Buffer);
   if (Ty == IceType_i16)
     emitOperandSizeOverride();
   emitAddrSizeOverridePrefix();
   emitRex(Ty, dst, RexRegIrrelevant);
   if (isByteSizedType(Ty)) {
     emitUint8(0xC6);
     static constexpr RelocOffsetT OffsetFromNextInstruction = 1;
     emitOperand(0, dst, OffsetFromNextInstruction);
     emitUint8(imm.value() & 0xFF);
@@ skipping 2325 matching lines @@
   emitRex(Ty, address, reg);
   emitUint8(0x0F);
   emitUint8(0xAF);
   emitOperand(gprEncoding(reg), address);
 }
 
 template <typename TraitsType>
 void AssemblerX86Base<TraitsType>::imul(Type Ty, GPRRegister reg,
                                         const Immediate &imm) {
   AssemblerBuffer::EnsureCapacity ensured(&Buffer);
-  assert(Ty == IceType_i16 || Ty == IceType_i32);
+  assert(Ty == IceType_i16 || Ty == IceType_i32 || Ty == IceType_i64);
   if (Ty == IceType_i16)
     emitOperandSizeOverride();
   emitRexRB(Ty, reg, reg);
   if (imm.is_int8()) {
     emitUint8(0x6B);
     emitRegisterOperand(gprEncoding(reg), gprEncoding(reg));
     emitUint8(imm.value() & 0xFF);
   } else {
     emitUint8(0x69);
     emitRegisterOperand(gprEncoding(reg), gprEncoding(reg));
@@ skipping 928 matching lines @@
   (void)shifter;
   if (Ty == IceType_i16)
     emitOperandSizeOverride();
   emitRexB(Ty, operand.rm());
   emitUint8(isByteSizedArithType(Ty) ? 0xD2 : 0xD3);
   emitOperand(rm, operand);
 }
 
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice