From 1440f53307347d3f3ee6da62b21e00cfd4cc968a Mon Sep 17 00:00:00 2001
From: Philip Reames <listmail@philipreames.com>
Date: Mon, 7 Dec 2015 21:41:29 +0000
Subject: [PATCH] Revert 254950

It's causing test failures on AArch64.  Due to a bad build config on my part, I apparently wasn't running the tests I thought I was.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254954 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/EarlyCSE.cpp | 89 +++++++++++++++---------------
 1 file changed, 44 insertions(+), 45 deletions(-)

diff --git a/lib/Transforms/Scalar/EarlyCSE.cpp b/lib/Transforms/Scalar/EarlyCSE.cpp
index 4c28d4bc5f7..b055044ba6d 100644
--- a/lib/Transforms/Scalar/EarlyCSE.cpp
+++ b/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -388,58 +388,57 @@ private:
   class ParseMemoryInst {
   public:
     ParseMemoryInst(Instruction *Inst, const TargetTransformInfo &TTI)
-      : IsTargetMemInst(false), Inst(Inst) {
-      if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst))
-        if (TTI.getTgtMemIntrinsic(II, Info) && Info.NumMemRefs == 1)
-          IsTargetMemInst = true;
-    }
-    bool isLoad() const {
-      if (IsTargetMemInst) return Info.ReadMem;
-      return isa<LoadInst>(Inst);
-    }
-    bool isStore() const {
-      if (IsTargetMemInst) return Info.WriteMem;
-      return isa<StoreInst>(Inst);
-    }
-    bool isSimple() const {
-      if (IsTargetMemInst) return Info.IsSimple;
-      if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
-        return LI->isSimple();
+      : Load(false), Store(false), IsSimple(true), MayReadFromMemory(false),
+        MayWriteToMemory(false), MatchingId(-1), Ptr(nullptr) {
+      MayReadFromMemory = Inst->mayReadFromMemory();
+      MayWriteToMemory = Inst->mayWriteToMemory();
+      if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst)) {
+        MemIntrinsicInfo Info;
+        if (!TTI.getTgtMemIntrinsic(II, Info))
+          return;
+        if (Info.NumMemRefs == 1) {
+          Store = Info.WriteMem;
+          Load = Info.ReadMem;
+          MatchingId = Info.MatchingId;
+          MayReadFromMemory = Info.ReadMem;
+          MayWriteToMemory = Info.WriteMem;
+          IsSimple = Info.IsSimple;
+          Ptr = Info.PtrVal;
+        }
+      } else if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
+        Load = true;
+        IsSimple = LI->isSimple();
+        Ptr = LI->getPointerOperand();
       } else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
-        return SI->isSimple();
+        Store = true;
+        IsSimple = SI->isSimple();
+        Ptr = SI->getPointerOperand();
       }
-      return Inst->isAtomic();
     }
+    bool isLoad() const { return Load; }
+    bool isStore() const { return Store; }
+    bool isSimple() const { return IsSimple; }
     bool isMatchingMemLoc(const ParseMemoryInst &Inst) const {
-      return (getPointerOperand() == Inst.getPointerOperand() &&
-              getMatchingId() == Inst.getMatchingId());
+      return Ptr == Inst.Ptr && MatchingId == Inst.MatchingId;
     }
-    bool isValid() const { return getPointerOperand() != nullptr; }
+    bool isValid() const { return Ptr != nullptr; }
+    int getMatchingId() const { return MatchingId; }
+    Value *getPtr() const { return Ptr; }
+    bool mayReadFromMemory() const { return MayReadFromMemory; }
+    bool mayWriteToMemory() const { return MayWriteToMemory; }
 
+  private:
+    bool Load;
+    bool Store;
+    bool IsSimple;
+    bool MayReadFromMemory;
+    bool MayWriteToMemory;
     // For regular (non-intrinsic) loads/stores, this is set to -1. For
     // intrinsic loads/stores, the id is retrieved from the corresponding
     // field in the MemIntrinsicInfo structure.  That field contains
     // non-negative values only.
-    int getMatchingId() const {
-      if (IsTargetMemInst) return Info.MatchingId;
-      return -1;
-    }
-    Value *getPointerOperand() const {
-      if (IsTargetMemInst) return Info.PtrVal;
-      if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
-        return LI->getPointerOperand();
-      } else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
-        return SI->getPointerOperand();
-      }
-      return nullptr;
-    }
-    bool mayReadFromMemory() const { return Inst->mayReadFromMemory(); }
-    bool mayWriteToMemory() const { return Inst->mayWriteToMemory(); }
-
-  private:
-    bool IsTargetMemInst;
-    MemIntrinsicInfo Info;
-    Instruction *Inst;
+    int MatchingId;
+    Value *Ptr;
   };
 
   bool processNode(DomTreeNode *Node);
@@ -566,7 +565,7 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
 
       // If we have an available version of this load, and if it is the right
       // generation, replace this instruction.
-      LoadValue InVal = AvailableLoads.lookup(MemInst.getPointerOperand());
+      LoadValue InVal = AvailableLoads.lookup(MemInst.getPtr());
       if (InVal.Data != nullptr && InVal.Generation == CurrentGeneration &&
           InVal.MatchingId == MemInst.getMatchingId()) {
         Value *Op = getOrCreateResult(InVal.Data, Inst->getType());
@@ -584,7 +583,7 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
 
       // Otherwise, remember that we have this instruction.
       AvailableLoads.insert(
-          MemInst.getPointerOperand(),
+          MemInst.getPtr(),
           LoadValue(Inst, CurrentGeneration, MemInst.getMatchingId()));
       LastStore = nullptr;
       continue;
@@ -660,7 +659,7 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
         // to non-volatile loads, so we don't have to check for volatility of
         // the store.
         AvailableLoads.insert(
-            MemInst.getPointerOperand(),
+            MemInst.getPtr(),
             LoadValue(Inst, CurrentGeneration, MemInst.getMatchingId()));
 
         // Remember that this was the last normal store we saw for DSE.
-- 
2.34.1