From 04289fcad89c76f52e7769b96586dffc00025b63 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 20 Sep 2011 22:27:16 +0000
Subject: Place the check for an exit landing pad where it will be run on both
 code paths through the if-then-else.

llvm-svn: 140195
---
 llvm/lib/Transforms/IPO/LoopExtractor.cpp | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

(limited to 'llvm/lib/Transforms/IPO/LoopExtractor.cpp')

diff --git a/llvm/lib/Transforms/IPO/LoopExtractor.cpp b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
index 826ade38d1e..4f96afe44c0 100644
--- a/llvm/lib/Transforms/IPO/LoopExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
@@ -105,21 +105,30 @@ bool LoopExtractor::runOnLoop(Loop *L, LPPassManager &LPM) {
     ShouldExtractLoop = true;
   } else {
     // Check to see if any exits from the loop are more than just return
-    // blocks. We also must omit landing pads. Landing pads must accompany the
-    // invoke instruction. But this would result in a loop in the extracted
+    // blocks.
+    SmallVector<BasicBlock*, 8> ExitBlocks;
+    L->getExitBlocks(ExitBlocks);
+    for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
+      if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator())) {
+        ShouldExtractLoop = true;
+        break;
+      }
+  }
+
+  if (ShouldExtractLoop) {
+    // We must omit landing pads. Landing pads must accompany the invoke
+    // instruction. But this would result in a loop in the extracted
     // function. An infinite cycle occurs when it tries to extract that loop as
     // well.
     SmallVector<BasicBlock*, 8> ExitBlocks;
     L->getExitBlocks(ExitBlocks);
-    for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
-      if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator()))
-        ShouldExtractLoop = true;
+    for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
       if (ExitBlocks[i]->isLandingPad()) {
         ShouldExtractLoop = false;
         break;
       }
-    }
   }
+
   if (ShouldExtractLoop) {
     if (NumLoops == 0) return Changed;
     --NumLoops;
-- 
cgit v1.2.3