From: Chris Lattner <sabre@nondot.org>
Date: Tue, 27 Sep 2005 21:33:12 +0000 (+0000)
Subject: Avoid spilling stack slots... to stack slots.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=4531371960f3a36790c34c4fd85838907ff65a9c;p=oota-llvm.git

Avoid spilling stack slots... to stack slots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23478 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Utils/LowerInvoke.cpp b/lib/Transforms/Utils/LowerInvoke.cpp
index 54724b5f1ac..0f664e151f9 100644
--- a/lib/Transforms/Utils/LowerInvoke.cpp
+++ b/lib/Transforms/Utils/LowerInvoke.cpp
@@ -334,6 +334,12 @@ splitLiveRangesLiveAcrossInvokes(std::vector<InvokeInst*> &Invokes) {
           cast<Instruction>(Inst->use_back())->getParent() == BB &&
           !isa<PHINode>(Inst->use_back())) continue;
       
+      // If this is an alloca in the entry block, it's not a real register
+      // value.
+      if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
+        if (isa<ConstantInt>(AI->getArraySize()) && BB == F->begin())
+          continue;
+      
       // Avoid iterator invalidation by copying users to a temporary vector.
       std::vector<Instruction*> Users;
       for (Value::use_iterator UI = Inst->use_begin(), E = Inst->use_end();