search for: machinebasicblock

I want to be able to do two things with LLVM (both just before code emission): 1. Insert a MachineBasicBlock just before a MachineBasicBlock. There is a function called AddPredecessor(). However, the comment says that it does not update the actual CFG. I want to redirect all CFG edges that are incoming to this MachineBasicBlock to the new one I create, and add just one outgoing edge (no branch) to the new...

...e if there is any problem in doing this? In my version of LLVM, I just had to make two changes in LiveIntervalAnalysis: //===--------------------------------------- First: when numbering the instructions: // <-- new code //===--------------------------------------- unsigned miIndex = 0; MachineBasicBlock *entry = mf_->begin(); std::set<MachineBasicBlock*> visited; for (df_ext_iterator<MachineBasicBlock*> dfi = df_ext_begin(entry, visited), endi = df_ext_end(entry, visited); dfi != endi; ++dfi) { MachineBasicBlock *mbb = *dfi; for (MachineB...

Also note: there may be multiple MachineBasicBlock's for a single BasicBlock. - David M On Fri, Oct 15, 2010 at 4:59 AM, Jeff Kunkel <jdkunk3 at gmail.com> wrote: > I don't think you can. > > The BasicBlock is a member of MachineBasicBlock. It is not inherited, > so it cannot be cast. The number of the MachineBasicBloc...

Hello, we can get BasicBlock from MachineBasicBlock through MachineBasicBlock::getBasicBlock() function, but how can I get MachineBasicBlock of a BasicBlock? Thank you!

I don't think you can. The BasicBlock is a member of MachineBasicBlock. It is not inherited, so it cannot be cast. The number of the MachineBasicBlock is not the same as any BasicBlock values. So MachineFunction::getMachineBasicBlock( BasicBlock::{get the number} ) cannot work. I do not see much in the basic block which can identify it. So you can search for it. typ...

...f the old source block. How do I do this? error almost for sure: I cannot create a new BasicBlock and add it to the function, because it is a MachineFunctionPass. But it seems to work in the way that I am doing: I get the basic block of the origin of the critical edge, and use it to create the new MachineBasicBlock. I know this seems wrong, but how to get around this? But, before running my pass, I am using LLVM function pass to break critical edges; thus, I only have to deal with critical edges inserted during the instruction selection phase, and both, origin and destiny of these critical edges contain the s...

...;s better :) good numbers + code = patch committed to cvs :) Thanks, nice idea btw! -Chris > //===--------------------------------------- > First: when numbering the instructions: > // <-- new code > //===--------------------------------------- > unsigned miIndex = 0; > MachineBasicBlock *entry = mf_->begin(); > std::set<MachineBasicBlock*> visited; > for (df_ext_iterator<MachineBasicBlock*> dfi = df_ext_begin(entry, > visited), > endi = df_ext_end(entry, visited); dfi != endi; > ++dfi) { > MachineBasicBlock *mbb = *d...

...is? In my version of LLVM, I just > had to make two changes in LiveIntervalAnalysis: > > //===--------------------------------------- > First: when numbering the instructions: > // <-- new code > //===--------------------------------------- > unsigned miIndex = 0; > MachineBasicBlock *entry = mf_->begin(); > std::set<MachineBasicBlock*> visited; > for (df_ext_iterator<MachineBasicBlock*> dfi = df_ext_begin(entry, > visited), > endi = df_ext_end(entry, visited); dfi != endi; > ++dfi) { > MachineBasicBlock *mbb...

On Tue, 4 Jul 2006, Fernando Magno Quintao Pereira wrote: > However, it does not remove all the critical edges. I am getting a very > weird dataflow graph (even without the Break Critical edges pass). The > dataflow generated by MachineFunction::dump() for the program below is > given here: > http://compilers.cs.ucla.edu/fernando/projects/soc/images/loop_no_crit2.pdf ... > The

On Sep 2, 2010, at 2:44 PMPDT, Jeff Kunkel wrote: > I need to track which MachineBasicBlocks branch into other > MachineBasicBlocks. How do I do it? Look at the Predecessor/Successor lists, which are target-independent > I see a MachineOperand can hold a MachineBasicBlock*. Does this mean > the instruction may branch to the MachineBasicBlock, or can it be > something l...

The attached patch fixes bugs related to MachineBasicBlock::iterator. I don't have any test cases that reproduce on an X86 machine the problems that this patch fixes (these bugs were found when make check was run on a mips board). Please review. The first part just ensures that iterator I is not instr_end() before it invokes isInsideBundle(). The sec...

Hi all, I am still stumped on the same bug. Did anyone try to insert MachineBasicBlock into a MachineFunction? Any advice will be appreciated. Thanks a lot in advance. ~Bin ---------------------------------------------------------------------------------------------------------------------------- Thanks a lot Jeff. I changed the setNumber function call to MBB->setNumber(mf->a...

Hi all, I think that I came somewhat closer to a solution for splitting a MachineBasicBlock for a PSEUDO_CALL_R instruction and having a label to the new MBB: For following piece of code: --- typedef int callme_t(int a, int b); callme_t* c01; int foo(int a, int b) { return c01(a,b); // MachineBasicBlock will be split at call instruction } --- I have initially following correspondence...

Hi, EveryOne: I am travelling CFG with MachineFunction. So I want to sure it. (Preccessors' Number) < MachineBasicBlock's Number < (Successors's Number), Is it really? best regards. ___________________________________________________________ 好玩贺卡等你发，邮箱贺卡全新上线！ http://card.mail.cn.yahoo.com/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm....

Hi all, I am really stumped on a problem for long. I could not figure out why. That is why i am here. OK, here is the problem: I tried to insert a MachineBasicBlock into a function. Here is the code snippet: // insert a machine basic block with the error_label into MF and before I // Pred is the predecessor of the block to be inserted // the new basic block is inserted right before I void X86CFIOptPass::insertBasicBlockBefore(MachineFunction &MF,...

Some stuff did not get pasted in properly. static MachineBasicBlock* ExpandCondMov(MachineInstr *MI, MachineBasicBlock *BB, DebugLoc dl, const MipsSubtarget *Subtarget, const TargetInstrInfo *TII, bool...

Thank you for your reply! > Every MachineBasicBlock has a list of successors; you can access it with > the successors() accessor. That's what you should be using for any CFG > analysis. I am aware of these methods of class MachineBasicBlock, which allows one to access a MachineBasicBlock's successors and predecessors in the CFG. Bu...

Can you please post the code to split a MachineBasicBlock? I am trying to split a MachineBasicBlock at a specific instruction in the MBB, let us say, into MBB1 and MBB2. This instruction should go into MBB2. Also MBB1 should have an unconditional branch to MBB2 as the terminator. (quite similar to splitBasicBlock in BasicBlock.cpp) Meanwhile, I am tryin...

Hi all, While I using BuildMI with MachineBasicBlock as parameter, I made a mistake. The mistake was that the MachineBasicBlock of instruction, which is for insertion, is different with given MachineBasicBlock as parameter. I have thought if there is assertion code to check whether MachineBasicBlocks are same between instruction's MachineBasi...

Hi all, Two days ago MachineBasicBlock got ilistified. What does this mean and how does it affect you? Read on. MachineBasicBlock used to have a std::vector<MachineInstr*> to represent the instructions it constisted of. This representation has the following problems: 1) O(n) insertions/removals to/from anywhere but the en...