Speculatively revert r97010, "Add an argument to PHITranslateValue to specify

the DominatorTree. ...", in hopes of restoring poor old PPC bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97027 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 28 deletions

diff --git a/lib/Analysis/PHITransAddr.cpp b/lib/Analysis/PHITransAddr.cpp
index 8e4fa03f21..334a188d12 100644
--- a/lib/Analysis/PHITransAddr.cpp
+++ b/lib/Analysis/PHITransAddr.cpp
@@ -134,8 +134,7 @@ static void RemoveInstInputs(Value *V,
 }
 
 Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
-                                         BasicBlock *PredBB,
-                                         const DominatorTree *DT) {
+                                         BasicBlock *PredBB) {
   // If this is a non-instruction value, it can't require PHI translation.
   Instruction *Inst = dyn_cast<Instruction>(V);
   if (Inst == 0) return V;
@@ -178,7 +177,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
   // operands need to be phi translated, and if so, reconstruct it.
   
   if (BitCastInst *BC = dyn_cast<BitCastInst>(Inst)) {
-    Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB, DT);
+    Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB);
     if (PHIIn == 0) return 0;
     if (PHIIn == BC->getOperand(0))
       return BC;
@@ -194,8 +193,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
     for (Value::use_iterator UI = PHIIn->use_begin(), E = PHIIn->use_end();
          UI != E; ++UI) {
       if (BitCastInst *BCI = dyn_cast<BitCastInst>(*UI))
-        if (BCI->getType() == BC->getType() &&
-            (!DT || DT->dominates(BCI->getParent(), PredBB)))
+        if (BCI->getType() == BC->getType())
           return BCI;
     }
     return 0;
@@ -206,7 +204,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
     SmallVector<Value*, 8> GEPOps;
     bool AnyChanged = false;
     for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i) {
-      Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB, DT);
+      Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB);
       if (GEPOp == 0) return 0;
       
       AnyChanged |= GEPOp != GEP->getOperand(i);
@@ -231,8 +229,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
       if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(*UI))
         if (GEPI->getType() == GEP->getType() &&
             GEPI->getNumOperands() == GEPOps.size() &&
-            GEPI->getParent()->getParent() == CurBB->getParent() &&
-            (!DT || DT->dominates(GEPI->getParent(), PredBB))) {
+            GEPI->getParent()->getParent() == CurBB->getParent()) {
           bool Mismatch = false;
           for (unsigned i = 0, e = GEPOps.size(); i != e; ++i)
             if (GEPI->getOperand(i) != GEPOps[i]) {
@@ -254,7 +251,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
     bool isNSW = cast<BinaryOperator>(Inst)->hasNoSignedWrap();
     bool isNUW = cast<BinaryOperator>(Inst)->hasNoUnsignedWrap();
     
-    Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB, DT);
+    Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB);
     if (LHS == 0) return 0;
     
     // If the PHI translated LHS is an add of a constant, fold the immediates.
@@ -290,8 +287,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
       if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*UI))
         if (BO->getOpcode() == Instruction::Add &&
             BO->getOperand(0) == LHS && BO->getOperand(1) == RHS &&
-            BO->getParent()->getParent() == CurBB->getParent() &&
-            (!DT || DT->dominates(BO->getParent(), PredBB)))
+            BO->getParent()->getParent() == CurBB->getParent())
           return BO;
     }
     
@@ -304,25 +300,34 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
 
 
 /// PHITranslateValue - PHI translate the current address up the CFG from
-/// CurBB to Pred, updating our state to reflect any needed changes.  If the
-/// dominator tree DT is non-null, the translated value must dominate
-/// PredBB.  This returns true on failure and sets Addr to null.
-bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB,
-                                     const DominatorTree *DT) {
+/// CurBB to Pred, updating our state the reflect any needed changes.  This
+/// returns true on failure and sets Addr to null.
+bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB) {
   assert(Verify() && "Invalid PHITransAddr!");
-  Addr = PHITranslateSubExpr(Addr, CurBB, PredBB, DT);
+  Addr = PHITranslateSubExpr(Addr, CurBB, PredBB);
   assert(Verify() && "Invalid PHITransAddr!");
-
-  if (DT) {
-    // Make sure the value is live in the predecessor.
-    if (Instruction *Inst = dyn_cast_or_null<Instruction>(Addr))
-      if (!DT->dominates(Inst->getParent(), PredBB))
-        Addr = 0;
-  }
-
   return Addr == 0;
 }
 
+/// GetAvailablePHITranslatedSubExpr - Return the value computed by
+/// PHITranslateSubExpr if it dominates PredBB, otherwise return null.
+Value *PHITransAddr::
+GetAvailablePHITranslatedSubExpr(Value *V, BasicBlock *CurBB,BasicBlock *PredBB,
+                                 const DominatorTree &DT) const {
+  PHITransAddr Tmp(V, TD);
+  Tmp.PHITranslateValue(CurBB, PredBB);
+  
+  // See if PHI translation succeeds.
+  V = Tmp.getAddr();
+  
+  // Make sure the value is live in the predecessor.
+  if (Instruction *Inst = dyn_cast_or_null<Instruction>(V))
+    if (!DT.dominates(Inst->getParent(), PredBB))
+      return 0;
+  return V;
+}
+
+
 /// PHITranslateWithInsertion - PHI translate this value into the specified
 /// predecessor block, inserting a computation of the value if it is
 /// unavailable.
@@ -360,9 +365,8 @@ InsertPHITranslatedSubExpr(Value *InVal, BasicBlock *CurBB,
                            SmallVectorImpl<Instruction*> &NewInsts) {
   // See if we have a version of this value already available and dominating
   // PredBB.  If so, there is no need to insert a new instance of it.
-  PHITransAddr Tmp(InVal, TD);
-  if (!Tmp.PHITranslateValue(CurBB, PredBB, &DT))
-    return Tmp.getAddr();
+  if (Value *Res = GetAvailablePHITranslatedSubExpr(InVal, CurBB, PredBB, DT))
+    return Res;
 
   // If we don't have an available version of this value, it must be an
   // instruction.