Initial Subzero WASM prototype.

src/IceInst.cpp

 //===- subzero/src/IceInst.cpp - High-level 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 57 matching lines @@
   { str }                                                                      \
   ,
     ICEINSTICMP_TABLE
 #undef X
 };
 
 } // end of anonymous namespace
 
 Inst::Inst(Cfg *Func, InstKind Kind, SizeT MaxSrcs, Variable *Dest)
     : Kind(Kind), Number(Func->newInstNumber()), Dest(Dest), MaxSrcs(MaxSrcs),
-      Srcs(Func->allocateArrayOf<Operand *>(MaxSrcs)), LiveRangesEnded(0) {}
+      Srcs(Func->allocateArrayOf<Operand *>(MaxSrcs)), LiveRangesEnded(0) {
+  if (Dest)
+    Dest->setDefiningInst(this);
+}
 
 IceString Inst::getInstName() const {
   if (!BuildDefs::dump())
     return "???";
 
   switch (Kind) {
 #define X(InstrKind, name)                                                     \
   case InstrKind:                                                              \
     return name
     X(Unreachable, "unreachable");
@@ skipping 922 matching lines @@
     // upper 32 bits of rax. We need to recognize and preserve these.
     return true;
   }
   if (!Dest->hasReg() && !SrcVar->hasReg() &&
       Dest->getStackOffset() == SrcVar->getStackOffset())
     return true;
   return false;
 }
 
 } // end of namespace Ice