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Don't generate a select whose operand is load of a weak

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external.  These may have address 0 and are not safe
to execute unconditionally.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71688 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-05-13 18:25:07 +00:00
parent 7f3b36da51
commit f8bc300821
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -18,6 +18,7 @@
#include "llvm/IntrinsicInst.h"
#include "llvm/Type.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Analysis/ConstantFolding.h"
@ -393,6 +394,11 @@ static bool DominatesMergePoint(Value *V, BasicBlock *BB,
if (!isa<AllocaInst>(I->getOperand(0)) &&
!isa<Constant>(I->getOperand(0)))
return false;
// External weak globals may have address 0, so we can't load them.
if (GlobalVariable* GV= dyn_cast<GlobalVariable>(I->getOperand(0))) {
if (GV->hasExternalWeakLinkage())
return false;
}
// Finally, we have to check to make sure there are no instructions
// before the load in its basic block, as we are going to hoist the loop