From d2e985fd323c167e20f77b045a1d99ad166e65db Mon Sep 17 00:00:00 2001
From: rdivacky <rdivacky@FreeBSD.org>
Date: Wed, 18 Nov 2009 14:58:34 +0000
Subject: Update LLVM to r89205.

---
 lib/Transforms/Scalar/LoopUnswitch.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'lib/Transforms/Scalar/LoopUnswitch.cpp')

diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp
index c7b00da..38d267a 100644
--- a/lib/Transforms/Scalar/LoopUnswitch.cpp
+++ b/lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -32,7 +32,6 @@
 #include "llvm/DerivedTypes.h"
 #include "llvm/Function.h"
 #include "llvm/Instructions.h"
-#include "llvm/LLVMContext.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/InlineCost.h"
 #include "llvm/Analysis/LoopInfo.h"
@@ -407,6 +406,10 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
   initLoopData();
   Function *F = loopHeader->getParent();
 
+  // If LoopSimplify was unable to form a preheader, don't do any unswitching.
+  if (!loopPreheader)
+    return false;
+
   // If the condition is trivial, always unswitch.  There is no code growth for
   // this case.
   if (!IsTrivialUnswitchCondition(LoopCond)) {
@@ -957,7 +960,7 @@ void LoopUnswitch::SimplifyCode(std::vector<Instruction*> &Worklist, Loop *L) {
     Worklist.pop_back();
     
     // Simple constant folding.
-    if (Constant *C = ConstantFoldInstruction(I, I->getContext())) {
+    if (Constant *C = ConstantFoldInstruction(I)) {
       ReplaceUsesOfWith(I, C, Worklist, L, LPM);
       continue;
     }
-- 
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