From 803a29d19f8e2564fe93e6c43eff2cb7f5934c6f Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 13 Dec 2010 04:15:19 +0000
Subject: [PATCH] inline a function, making the result much simpler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121675 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/SimplifyCFG.cpp | 38 ++++++++--------------------
 1 file changed, 11 insertions(+), 27 deletions(-)

diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 68f6905d4b5..d3181b138a7 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -347,31 +347,6 @@ GatherConstantSetNEs(Value *V, std::vector<ConstantInt*> &Values,
   return 0;
 }
 
-/// GatherValueComparisons - If the specified Cond is an 'and' or 'or' of a
-/// bunch of comparisons of one value against constants, return the value and
-/// the constants being compared.
-static bool GatherValueComparisons(Value *CondV, Value *&CompVal,
-                                   std::vector<ConstantInt*> &Values,
-                                   const TargetData *TD) {
-  Instruction *Cond = dyn_cast<Instruction>(CondV);
-  if (Cond == 0) return false;
-  
-  if (Cond->getOpcode() == Instruction::Or) {
-    CompVal = GatherConstantSetEQs(Cond, Values, TD);
-
-    // Return true to indicate that the condition is true if the CompVal is
-    // equal to one of the constants.
-    return true;
-  }
-  if (Cond->getOpcode() == Instruction::And) {
-    CompVal = GatherConstantSetNEs(Cond, Values, TD);
-
-    // Return false to indicate that the condition is false if the CompVal is
-    // equal to one of the constants.
-    return false;
-  }
-  return false;
-}
 
 static void EraseTerminatorInstAndDCECond(TerminatorInst *TI) {
   Instruction* Cond = 0;
@@ -2096,8 +2071,17 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
       // 'setne's and'ed together, collect them.
       Value *CompVal = 0;
       std::vector<ConstantInt*> Values;
-      bool TrueWhenEqual = GatherValueComparisons(BI->getCondition(), CompVal,
-                                                  Values, TD);
+      bool TrueWhenEqual = true;
+      
+      if (Instruction *Cond = dyn_cast<Instruction>(BI->getCondition())) {
+        if (Cond->getOpcode() == Instruction::Or) {
+          CompVal = GatherConstantSetEQs(Cond, Values, TD);
+        } else if (Cond->getOpcode() == Instruction::And) {
+          CompVal = GatherConstantSetNEs(Cond, Values, TD);
+          TrueWhenEqual = false;
+        }
+      }
+
       if (CompVal) {
         // There might be duplicate constants in the list, which the switch
         // instruction can't handle, remove them now.