Subzero: Partial implementation of global initializers.

src/IceInstX8632.cpp

 //===- subzero/src/IceInstX8632.cpp - X86-32 instruction implementation ---===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the InstX8632 and OperandX8632 classes,
@@ skipping 637 matching lines @@
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "storeq." << getSrc(0)->getType() << " ";
   getSrc(1)->dump(Func);
   Str << ", ";
   getSrc(0)->dump(Func);
 }
 
 void InstX8632Mov::emit(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrEmit();
   assert(getSrcSize() == 1);
-  Str << "\tmov" << TypeX8632Attributes[getDest()->getType()].SdSsString
-      << "\t";
+  Operand *Src = getSrc(0);
+  // The llvm-mc assembler using Intel syntax has a bug in which "mov
+  // reg, RelocatableConstant" does not generate the right instruction
+  // with a relocation.  To work around, we emit "lea reg,
+  // [RelocatableConstant]".  Also, the lowering and legalization is
+  // changed to allow relocatable constants only in Assign and Call
+  // instructions or in Mem operands.  TODO(stichnot): remove LEAHACK
+  // once a proper emitter is used.
+  bool UseLeaHack = llvm::isa<ConstantRelocatable>(Src);
+  Str << "\t";
+  if (UseLeaHack)
+    Str << "lea";
+  else
+    Str << "mov" << TypeX8632Attributes[getDest()->getType()].SdSsString;
+  Str << "\t";
   // For an integer truncation operation, src is wider than dest.
   // Ideally, we use a mov instruction whose data width matches the
   // narrower dest.  This is a problem if e.g. src is a register like
   // esi or si where there is no 8-bit version of the register.  To be
   // safe, we instead widen the dest to match src.  This works even
   // for stack-allocated dest variables because typeWidthOnStack()
   // pads to a 4-byte boundary even if only a lower portion is used.
   assert(Func->getTarget()->typeWidthInBytesOnStack(getDest()->getType()) ==
-         Func->getTarget()->typeWidthInBytesOnStack(getSrc(0)->getType()));
-  getDest()->asType(getSrc(0)->getType()).emit(Func);
+         Func->getTarget()->typeWidthInBytesOnStack(Src->getType()));
+  getDest()->asType(Src->getType()).emit(Func);
   Str << ", ";
-  getSrc(0)->emit(Func);
+  Src->emit(Func);
   Str << "\n";
 }
 
 void InstX8632Mov::dump(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "mov." << getDest()->getType() << " ";
   dumpDest(Func);
   Str << ", ";
   dumpSources(Func);
 }
@@ skipping 329 matching lines @@
   default:
     Str << "???";
     break;
   }
   Str << "(";
   Var->dump(Func);
   Str << ")";
 }
 
 } // end of namespace Ice