Subzero. Adds a pass for target-specific helper call generation.

src/IceInst.h

 //===- subzero/src/IceInst.h - High-level instructions ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 360 matching lines @@
 
 /// Call instruction. The call target is captured as getSrc(0), and arg I is
 /// captured as getSrc(I+1).
 class InstCall : public InstHighLevel {
   InstCall() = delete;
   InstCall(const InstCall &) = delete;
   InstCall &operator=(const InstCall &) = delete;
 
 public:
   static InstCall *create(Cfg *Func, SizeT NumArgs, Variable *Dest,
-                          Operand *CallTarget, bool HasTailCall) {
+                          Operand *CallTarget, bool HasTailCall,
+                          bool IsTargetHelperCall = false) {
     /// Set HasSideEffects to true so that the call instruction can't be
     /// dead-code eliminated. IntrinsicCalls can override this if the particular
     /// intrinsic is deletable and has no side-effects.
     constexpr bool HasSideEffects = true;
     constexpr InstKind Kind = Inst::Call;
-    return new (Func->allocate<InstCall>()) InstCall(
-        Func, NumArgs, Dest, CallTarget, HasTailCall, HasSideEffects, Kind);
+    return new (Func->allocate<InstCall>())
+        InstCall(Func, NumArgs, Dest, CallTarget, HasTailCall,
+                 IsTargetHelperCall, HasSideEffects, Kind);
   }
   void addArg(Operand *Arg) { addSource(Arg); }
   Operand *getCallTarget() const { return getSrc(0); }
   Operand *getArg(SizeT I) const { return getSrc(I + 1); }
   SizeT getNumArgs() const { return getSrcSize() - 1; }
   bool isTailcall() const { return HasTailCall; }
+  bool isTargetHelperCall() const { return IsTargetHelperCall; }
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return Inst->getKind() == Call; }
   Type getReturnType() const;
 
 protected:
   InstCall(Cfg *Func, SizeT NumArgs, Variable *Dest, Operand *CallTarget,
-           bool HasTailCall, bool HasSideEff, InstKind Kind)
-      : InstHighLevel(Func, Kind, NumArgs + 1, Dest), HasTailCall(HasTailCall) {
+           bool HasTailCall, bool IsTargetHelperCall, bool HasSideEff,
+           InstKind Kind)
+      : InstHighLevel(Func, Kind, NumArgs + 1, Dest), HasTailCall(HasTailCall),
+        IsTargetHelperCall(IsTargetHelperCall) {
     HasSideEffects = HasSideEff;
     addSource(CallTarget);
   }
 
 private:
-  bool HasTailCall;
+  const bool HasTailCall;
+  const bool IsTargetHelperCall;
 };
 
 /// Cast instruction (a.k.a. conversion operation).
 class InstCast : public InstHighLevel {
   InstCast() = delete;
   InstCast(const InstCast &) = delete;
   InstCast &operator=(const InstCast &) = delete;
 
 public:
   enum OpKind {
@@ skipping 144 matching lines @@
   }
   static bool classof(const Inst *Inst) {
     return Inst->getKind() == IntrinsicCall;
   }
 
   Intrinsics::IntrinsicInfo getIntrinsicInfo() const { return Info; }
 
 private:
   InstIntrinsicCall(Cfg *Func, SizeT NumArgs, Variable *Dest,
                     Operand *CallTarget, const Intrinsics::IntrinsicInfo &Info)
-      : InstCall(Func, NumArgs, Dest, CallTarget, false, Info.HasSideEffects,
-                 Inst::IntrinsicCall),
+      : InstCall(Func, NumArgs, Dest, CallTarget, false, false,
+                 Info.HasSideEffects, Inst::IntrinsicCall),
         Info(Info) {}
 
   const Intrinsics::IntrinsicInfo Info;
 };
 
 /// Load instruction. The source address is captured in getSrc(0).
 class InstLoad : public InstHighLevel {
   InstLoad() = delete;
   InstLoad(const InstLoad &) = delete;
   InstLoad &operator=(const InstLoad &) = delete;
@@ skipping 394 matching lines @@
   static void noteHead(Ice::Inst *, Ice::Inst *) {}
   void deleteNode(Ice::Inst *) {}
 
 private:
   mutable ilist_half_node<Ice::Inst> Sentinel;
 };
 
 } // end of namespace llvm
 
 #endif // SUBZERO_SRC_ICEINST_H