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src/IcePhiLoweringImpl.h

 //===------ subzero/src/IcePhiLoweringImpl.h - Phi lowering -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// This contains utilities for targets to lower Phis.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEPHILOWERINGIMPL_H
 #define SUBZERO_SRC_ICEPHILOWERINGIMPL_H
 
 #include "IceCfg.h"
 #include "IceCfgNode.h"
 #include "IceDefs.h"
 #include "IceInst.h"
 #include "IceOperand.h"
 
 namespace Ice {
 namespace PhiLowering {
 
-// Turn an i64 Phi instruction into a pair of i32 Phi instructions, to
-// preserve integrity of liveness analysis.  This is needed for 32-bit
-// targets.  This assumes the 32-bit target has loOperand, hiOperand,
-// and legalizeUndef methods.  Undef values are also legalized, since
-// loOperand() and hiOperand() don't expect Undef input.
+/// Turn an i64 Phi instruction into a pair of i32 Phi instructions, to preserve
+/// integrity of liveness analysis. This is needed for 32-bit targets. This
+/// assumes the 32-bit target has loOperand, hiOperand, and legalizeUndef
+/// methods. Undef values are also legalized, since loOperand() and hiOperand()
+/// don't expect Undef input.
 template <class TargetT>
 void prelowerPhis32Bit(TargetT *Target, CfgNode *Node, Cfg *Func) {
   for (Inst &I : Node->getPhis()) {
     auto Phi = llvm::dyn_cast<InstPhi>(&I);
     if (Phi->isDeleted())
       continue;
     Variable *Dest = Phi->getDest();
     if (Dest->getType() == IceType_i64) {
       Variable *DestLo = llvm::cast<Variable>(Target->loOperand(Dest));
       Variable *DestHi = llvm::cast<Variable>(Target->hiOperand(Dest));
@@ skipping 10 matching lines @@
       Node->getPhis().push_back(PhiHi);
       Phi->setDeleted();
     }
   }
 }
 
 } // end of namespace PhiLowering
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEPHILOWERINGIMPL_H