Displaying 6 results from an estimated 6 matches for "getlooppreheader".
2005 Aug 13
1
[LLVMdev] Adding instructions to loop
I am attempting to add instructions before and after all loops. To do
this, I've added a simple function as follows:
void addToAllLoops(Loop * IL) {
addToAllLoops(IL);
BasicBlock * PH = IL->getLoopPreheader();
Instruction *InstrCallPre = new CallInst(PrintLoopBegin, "",
PH->getPrev());
return;
}
The function added is trivial:
void printloopbegin() {
fprintf (stderr,"Loop Beginning\n");
}
The function is called from runOnFunction() as follows:
P...
2019 Oct 30
2
How to make ScalarEvolution recompute SCEV values?
...rEvolution and LoopInfo analysis pass during my pass?
This is my current CloneLoop function:
Loop *cloneLoop(Function *F, Loop *L, LoopInfo *LI, const Twine &NameSuffix,
ValueToValueMapTy &VMap) {
// original preheader of the loop
const auto PreHeader = L->getLoopPreheader();
// keep track of the original predecessors
std::set<BasicBlock *> AllPredecessors;
for (auto PredIt = pred_begin(PreHeader), E = pred_end(PreHeader);
PredIt != E; PredIt++)
AllPredecessors.insert(*PredIt);
BasicBlock *ExitBlock = L->getExitBloc...
2004 May 02
1
[LLVMdev] hoisting problem.
...s a branch)
Instruction* I2 = I->clone();
I2->setName("Billy");
I->replaceAllUsesWith(I2);
I->getParent()->getInstList().remove(I);
//we want to insert before the
//branch at the end
iplist<Instruction> preheaderInsts =
L->getLoopPreheader()->getInstList();
iplist<Instruction>::iterator i = preheaderInsts.end();
i--;
preheaderInsts.insert(i, I2);
//I->getParent()->getInstList().remove(I);
DEBUG(std::cerr << "HOIST: DONE\n");
return false;
}
==========...
2010 Nov 17
1
[LLVMdev] L->isLoopInvariant giving wrong results?
...rved<ScalarEvolution>();
AU.addPreservedID(LoopSimplifyID);
}
};
}
char MyLoopPass::ID=0;
INITIALIZE_PASS(MyLoopPass, "myLICM", "simple LICM pass", false, false);
bool MyLoopPass::runOnLoop(Loop * L, LPPassManager &lpm){
//find loop pre-header
BasicBlock* pre=L->getLoopPreheader();
curLoop=L;
changed=false;
BasicBlock* lat=L->getLoopLatch();
LI = &getAnalysis<LoopInfo>();
DT = &getAnalysis<DominatorTree>();
errs() <<"Loop Pre-Header:" << *pre;
errs() <<"Loop Latch:" << *lat;
for (BasicBlock::iterator i =...
2010 Nov 17
0
[LLVMdev] L->isLoopInvariant giving wrong results?
i am getting seg fault on functions like I->eraseFromParent also.
I'm assuming that the problem comes when i change the loop structure.
On Thu, Nov 18, 2010 at 4:05 AM, Sreeraj a <writetosrj at gmail.com> wrote:
> The funny thing is that i am manually able to hoist the Loop invariant
> instruction to the basicBlock terminator, by editing the human readable form
> and then
2010 Nov 17
2
[LLVMdev] L->isLoopInvariant giving wrong results?
The funny thing is that i am manually able to hoist the Loop invariant
instruction to the basicBlock terminator, by editing the human readable form
and then using llvm-as to convert it into bytecode.
On Thu, Nov 18, 2010 at 4:01 AM, Chris Lattner <clattner at apple.com> wrote:
>
> On Nov 17, 2010, at 1:38 PM, Sreeraj a wrote:
>
> > Thanks Chris,
> >
> > I was