From: Owen Anderson <resistor@mac.com>
Date: Wed, 19 Jul 2006 05:45:14 +0000 (+0000)
Subject: Make LoopUnroll not die on LCSSA Phis.  This makes lencod work again.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2698a08c23828865c96adf48f7d6c5b5f616b521;p=oota-llvm.git

Make LoopUnroll not die on LCSSA Phis.  This makes lencod work again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29198 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LoopUnroll.cpp b/lib/Transforms/Scalar/LoopUnroll.cpp
index 4f2a0e0b62e..6f7df426f16 100644
--- a/lib/Transforms/Scalar/LoopUnroll.cpp
+++ b/lib/Transforms/Scalar/LoopUnroll.cpp
@@ -269,6 +269,12 @@ bool LoopUnroll::visitLoop(Loop *L) {
 
   // FIXME: Should update dominator analyses
 
+  // Remove LCSSA Phis from the exit block
+  for (BasicBlock::iterator ExitInstr = LoopExit->begin();
+       PHINode* PN = dyn_cast<PHINode>(ExitInstr); ++ExitInstr) {
+    PN->replaceAllUsesWith(PN->getOperand(0));
+    PN->eraseFromParent();
+  }
 
   // Now that everything is up-to-date that will be, we fold the loop block into
   // the preheader and exit block, updating our analyses as we go.