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Skip debug info one more place. (This one gets

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called from llc, not opt, but it's an IR level
optimization nevertheless.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67724 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-03-26 01:15:07 +00:00
parent 575ec806e0
commit 6aae1d6582
1 changed files with 12 additions and 6 deletions
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18
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -20,6 +20,7 @@
#include "llvm/Function.h"
#include "llvm/InlineAsm.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Pass.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
@ -350,15 +351,20 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum,
BasicBlock *Pred = *PI;
// To be usable, the pred has to end with an uncond branch to the dest.
BranchInst *PredBr = dyn_cast<BranchInst>(Pred->getTerminator());
if (!PredBr || !PredBr->isUnconditional() ||
// Must be empty other than the branch.
&Pred->front() != PredBr ||
// Cannot be the entry block; its label does not get emitted.
Pred == &(Dest->getParent()->getEntryBlock()))
if (!PredBr || !PredBr->isUnconditional())
continue;
// Must be empty other than the branch and debug info.
BasicBlock::iterator I = Pred->begin();
while (isa<DbgInfoIntrinsic>(I))
I++;
if (dyn_cast<Instruction>(I) != PredBr)
continue;
// Cannot be the entry block; its label does not get emitted.
if (Pred == &(Dest->getParent()->getEntryBlock()))
continue;
// Finally, since we know that Dest has phi nodes in it, we have to make
// sure that jumping to Pred will have the same affect as going to Dest in
// sure that jumping to Pred will have the same effect as going to Dest in
// terms of PHI values.
PHINode *PN;
unsigned PHINo = 0;