From 789558db70d9513a017c11c5be30945839fdff1c Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Tue, 13 Jan 2009 09:18:58 +0000
Subject: Wind SCEV back in time, to Nov 18th. This 'fixes' PR3275, PR3294,
 PR3295, PR3296 and PR3302.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62160 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Analysis/ScalarEvolution.h            |  1 -
 include/llvm/Analysis/ScalarEvolutionExpander.h    |  5 +-
 include/llvm/Analysis/ScalarEvolutionExpressions.h | 53 +---------------------
 3 files changed, 3 insertions(+), 56 deletions(-)

(limited to 'include')

diff --git a/include/llvm/Analysis/ScalarEvolution.h b/include/llvm/Analysis/ScalarEvolution.h
index f524daa..e16e990 100644
--- a/include/llvm/Analysis/ScalarEvolution.h
+++ b/include/llvm/Analysis/ScalarEvolution.h
@@ -225,7 +225,6 @@ namespace llvm {
       return getMulExpr(Ops);
     }
     SCEVHandle getUDivExpr(const SCEVHandle &LHS, const SCEVHandle &RHS);
-    SCEVHandle getSDivExpr(const SCEVHandle &LHS, const SCEVHandle &RHS);
     SCEVHandle getAddRecExpr(const SCEVHandle &Start, const SCEVHandle &Step,
                              const Loop *L);
     SCEVHandle getAddRecExpr(std::vector<SCEVHandle> &Operands,
diff --git a/include/llvm/Analysis/ScalarEvolutionExpander.h b/include/llvm/Analysis/ScalarEvolutionExpander.h
index a3ed17d..cd075ef 100644
--- a/include/llvm/Analysis/ScalarEvolutionExpander.h
+++ b/include/llvm/Analysis/ScalarEvolutionExpander.h
@@ -14,7 +14,7 @@
 #ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
 #define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
 
-#include "llvm/Instruction.h"
+#include "llvm/Instructions.h"
 #include "llvm/Type.h"
 #include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/Analysis/ScalarEvolutionExpressions.h"
@@ -104,8 +104,6 @@ namespace llvm {
 
     Value *visitUDivExpr(SCEVUDivExpr *S);
 
-    Value *visitSDivExpr(SCEVSDivExpr *S);
-
     Value *visitAddRecExpr(SCEVAddRecExpr *S);
 
     Value *visitSMaxExpr(SCEVSMaxExpr *S);
@@ -119,3 +117,4 @@ namespace llvm {
 }
 
 #endif
+
diff --git a/include/llvm/Analysis/ScalarEvolutionExpressions.h b/include/llvm/Analysis/ScalarEvolutionExpressions.h
index bedd075..652a99d 100644
--- a/include/llvm/Analysis/ScalarEvolutionExpressions.h
+++ b/include/llvm/Analysis/ScalarEvolutionExpressions.h
@@ -25,7 +25,7 @@ namespace llvm {
     // These should be ordered in terms of increasing complexity to make the
     // folders simpler.
     scConstant, scTruncate, scZeroExtend, scSignExtend, scAddExpr, scMulExpr,
-    scUDivExpr, scSDivExpr, scAddRecExpr, scUMaxExpr, scSMaxExpr, scUnknown,
+    scUDivExpr, scAddRecExpr, scUMaxExpr, scSMaxExpr, scUnknown,
     scCouldNotCompute
   };
 
@@ -358,55 +358,6 @@ namespace llvm {
 
 
   //===--------------------------------------------------------------------===//
-  /// SCEVSDivExpr - This class represents a binary signed division operation.
-  ///
-  class SCEVSDivExpr : public SCEV {
-    friend class ScalarEvolution;
-
-    SCEVHandle LHS, RHS;
-    SCEVSDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
-      : SCEV(scSDivExpr), LHS(lhs), RHS(rhs) {}
-
-    virtual ~SCEVSDivExpr();
-  public:
-    const SCEVHandle &getLHS() const { return LHS; }
-    const SCEVHandle &getRHS() const { return RHS; }
-
-    virtual bool isLoopInvariant(const Loop *L) const {
-      return LHS->isLoopInvariant(L) && RHS->isLoopInvariant(L);
-    }
-
-    virtual bool hasComputableLoopEvolution(const Loop *L) const {
-      return LHS->hasComputableLoopEvolution(L) &&
-             RHS->hasComputableLoopEvolution(L);
-    }
-
-    SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
-                                                 const SCEVHandle &Conc,
-                                                 ScalarEvolution &SE) const {
-      SCEVHandle L = LHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
-      SCEVHandle R = RHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
-      if (L == LHS && R == RHS)
-        return this;
-      else
-        return SE.getSDivExpr(L, R);
-    }
-
-
-    virtual const Type *getType() const;
-
-    void print(std::ostream &OS) const;
-    void print(std::ostream *OS) const { if (OS) print(*OS); }
-
-    /// Methods for support type inquiry through isa, cast, and dyn_cast:
-    static inline bool classof(const SCEVSDivExpr *S) { return true; }
-    static inline bool classof(const SCEV *S) {
-      return S->getSCEVType() == scSDivExpr;
-    }
-  };
-
-
-  //===--------------------------------------------------------------------===//
   /// SCEVAddRecExpr - This node represents a polynomial recurrence on the trip
   /// count of the specified loop.
   ///
@@ -599,8 +550,6 @@ namespace llvm {
         return ((SC*)this)->visitMulExpr((SCEVMulExpr*)S);
       case scUDivExpr:
         return ((SC*)this)->visitUDivExpr((SCEVUDivExpr*)S);
-      case scSDivExpr:
-        return ((SC*)this)->visitSDivExpr((SCEVSDivExpr*)S);
       case scAddRecExpr:
         return ((SC*)this)->visitAddRecExpr((SCEVAddRecExpr*)S);
       case scSMaxExpr:
-- 
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