From: Dan Gohman <gohman@apple.com>
Date: Thu, 13 May 2010 19:19:32 +0000 (+0000)
Subject: An Instruction has a trivial kill only if its use is in the same
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e1308d86ed2402483aa9d056af531fd773e1121f;p=oota-llvm.git

An Instruction has a trivial kill only if its use is in the same
basic block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103725 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 24456504ccf..253ceca15eb 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -57,9 +57,12 @@
 using namespace llvm;
 
 bool FastISel::hasTrivialKill(const Value *V) const {
-  // Don't consider constants or arguments to have trivial kills.
+  // Don't consider constants or arguments to have trivial kills. Only
+  // instructions with a single use in the same basic block.
   const Instruction *I = dyn_cast<Instruction>(V);
-  return I && I->hasOneUse();
+  return I &&
+         I->hasOneUse() &&
+         cast<Instruction>(I->use_begin())->getParent() == I->getParent();
 }
 
 unsigned FastISel::getRegForValue(const Value *V) {