From cbe1d940313a0e7d75820f2c92a6c089fbc15f5a Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Sun, 14 Dec 2008 19:10:35 +0000
Subject: [PATCH] Generalize GVN's phi construciton routine to work for things
 other than loads.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61009 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/GVN.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index 2081811f0d1..5e5e8b77022 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -728,7 +728,7 @@ namespace {
     bool processNonLocalLoad(LoadInst* L,
                              SmallVectorImpl<Instruction*> &toErase);
     bool processBlock(DomTreeNode* DTN);
-    Value *GetValueForBlock(BasicBlock *BB, LoadInst* orig,
+    Value *GetValueForBlock(BasicBlock *BB, Instruction* orig,
                             DenseMap<BasicBlock*, Value*> &Phis,
                             bool top_level = false);
     void dump(DenseMap<uint32_t, Value*>& d);
@@ -789,7 +789,7 @@ bool GVN::isSafeReplacement(PHINode* p, Instruction* inst) {
 
 /// GetValueForBlock - Get the value to use within the specified basic block.
 /// available values are in Phis.
-Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
+Value *GVN::GetValueForBlock(BasicBlock *BB, Instruction* orig,
                              DenseMap<BasicBlock*, Value*> &Phis,
                              bool top_level) { 
                                  
@@ -837,7 +837,11 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
   Value* v = CollapsePhi(PN);
   if (!v) {
     // Cache our phi construction results
-    phiMap[orig->getPointerOperand()].insert(PN);
+    if (LoadInst* L = dyn_cast<LoadInst>(orig))
+      phiMap[L->getPointerOperand()].insert(PN);
+    else
+      phiMap[orig].insert(PN);
+    
     return PN;
   }