similar to: [LLVMdev] replacing a global variable by a constant

Hi nada, > i want replacing a global variable by a constant value for erase instruction. I'm not sure what you mean exactly. A GlobalVariable has pointer type. Do you want to replace that pointer by a constant pointer? Or is it rather that you want to say that the contents of the memory pointed to by the GlobalVariable is constant, and have all places that load that GlobalVariable

I would delete the Loop. I used the following code. cout << "begin to delete loop" << endl; for (Loop::block_iterator bi = L->block_begin(), bi2; bi != L->block_end(); bi = bi2) { bi2 = bi; bi2++; BasicBlock * BB = *bi; for (BasicBlock::iterator ii = BB->begin(), ii2; ii != BB->end(); ii= ii2) { ii2 = ii;

Hi I have checked all blocks, each block have a Terminator instruction and each blocks belongs to a function. I'm really confused. I guess the problem is caused by the removal of the Loop,The code is as follows: * //every block to header (except the ones in the loop), will now redirect to newblock for (pred_iterator PI = pred_begin(header); PI != pred_end(header); ++PI) {

Hi, All I want to implement DSWP Which is used for parallelization of loops. For this purpose, the loop was replaced with a new basic block in main function. And new functions were created and basic blocks of Loop assigned to them.I have checked blocks and branches for Succ and Pred relation and I have not found any problems. However I get the following error: * **opt:

A simulator should be expecting the machine opcodes not macros. LD shouldn't care at all as long as the object format plays well. I would think it would be better to fix the simulator. Jack ________________________________________ From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] on behalf of llvmdev-request at cs.uiuc.edu [llvmdev-request at cs.uiuc.edu] Sent: Thursday,

Thanks a lot for your help Matthijs! :) basically this does the job quite nicely I think: for (llvm::GlobalVariable::use_iterator U = gv->use_begin(); U != gv->use_end(); ++U) { llvm::Instruction *I = llvm::cast<llvm::Instruction>(U); I->replaceAllUsesWith(constPtr); I->eraseFromParent(); } Cheers, Ralf Matthijs Kooijman wrote: > Hi Ralf, > > >> I

On Tue, Apr 11, 2017 at 3:14 PM, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > Hi Kostya, > > On April 11, 2017 at 2:39:44 PM, Kostya Serebryany (kcc at google.com) wrote: > > > ptr0 = malloc(); > > > free(ptr0); > > > ptr1 = malloc(); > > > > > > ptr0 and ptr1 will be NoAlias despite overlapping (there is actually a > >

Hello, I am writing a JIT compiler for a subset of the Matlab language and as a part of my implementation, I would like to be able to pass a constant pointer to a native function I'm calling. Right now, this is what I do: llvm::Constant* constInt = llvm::ConstantInt::get(llvm::Type::Int64Ty, (int64)thePointer); llvm::Value* constPtr = llvm::ConstantExpr::getIntToPtr(constInt,

On Tue, Apr 11, 2017 at 1:40 PM, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > Hi, > > On April 11, 2017 at 1:37:20 PM, Sanjoy Das > (sanjoy at playingwithpointers.com) wrote: > > Hi Kostya, > > > > On April 11, 2017 at 1:30:10 PM, Kostya Serebryany (kcc at google.com) > wrote: > > > > > of course, but accesses are done via pointers,

Hi Ralf, > I am trying to replace a global variable with a constant. You should be able to replace the initializer for the global with your constant, mark it as having internal linkage and then run some optimization pass over it to do the rest (not sure which one it was again, probably some constant propagation or global value optimization). That pass would then probably do some similar

Hi, I am trying to replace a global variable with a constant. I did manage to do it, but somehow it appears to be fairly bruteforce by just iterating over all functions/bblocks/instructions and filtering for those that load the variable and replacing the instruction with Instruction::replaceAllUsesWith(). The more intuitive way of iterating over the uses of the variable did not work out as I

Hi Fellows, I notice an unexpected behavior in RegionInfo's block_iterator. Consider the following situation: a user creates her own region containing just a single basic block TheBB, then tries to have the block_iterator to print a DFS traversal of the region. The expected behavior should be that only the single basic block TheBB will be printed, but the real behavior is that

On Fri, May 2, 2014 at 5:30 PM, Tobias Grosser <tobias at grosser.es> wrote: > On 03/05/2014 00:15, Paul Vario wrote: > >> Hi Tobias, >> >> Thanks so much for the quick response. Your approach fixes the >> issue. >> On a bigger context, would it make more sense to make the region >> exit >> part of the region? For example, a while

On 2009-03-08, at 12:46, Nyx wrote: > I am writing a JIT compiler for a subset of the Matlab language and > as a > part of my implementation, I would like to be able to pass a constant > pointer to a native function I'm calling. > > Right now, this is what I do: > > llvm::Constant* constInt = llvm::ConstantInt::get(llvm::Type::Int64Ty, > (int64)thePointer); >

Thanks, but I replaceAllUsesWith() - works well, but I still get bug in eraseFromParent(): While deleting: i32 (%class.B*, i32)* %_ZN1B1xEi An asserting value handle still pointed to this value! UNREACHABLE executed at /Users/neonomaly/LLVM/LLVM/lib/VMCore/Value.cpp:561! Yours sincerely, Kadysev Mikhail 21.04.2012, в 23:45, Nick Lewycky написал(а): > Михаил wrote: >> How correctly

Hi Tobias, Thanks so much for the quick response. Your approach fixes the issue. On a bigger context, would it make more sense to make the region exit part of the region? For example, a while loop gets lowered down to LLVM IR contains while.cond, while.body and while.end. If one tries to use RegionInfo as a substitute for structural analysis, she might think while.end should belong to

Hello; I wrote this simple loop pass to collect the number of instructions in each loop of the program. The code is as follows- #define DEBUG_TYPE "loopinst" #include "llvm/Pass.h" #include "llvm/Analysis/LoopPass.h" #include "llvm/Support/raw_ostream.h" #include "llvm/ADT/Statistic.h" #include "llvm/Instructions.h" #include

LLVM is built in Release mode. The version is 6.0.0. I think that a similar code worked on verison 3.9.0. It is probably a null pointer dereference occurring in eraseFromParent(). I checked and reconfirmed that the instruction had no uses. Perhaps I should rebuild LLVM. Thanks. On Wed, Aug 8, 2018 at 9:03 PM, mayuyu.io <admin at mayuyu.io> wrote: > Hmmmm that’s strange. Do you get an

How correctly remove function from module? For example: int f1(int x) { ... a = f2(smth); ... } int f2 (int y) { ... b = f1(smth); ... } I need delete from module both f1 and f2. They haven't uses in other part of module, but I can't delete them with eraseFromParent, because they are use each other. Yours sincerely, Kadysev Mikhail -------------- next part

Hi. Thanks. I changed the code but the problem exists. This is my new code which is again very simple: ... bool runOnFunction(Function &F) override { vector<Instruction *> dels; dels.clear(); for (inst_iterator It = inst_begin(&F), Ie = inst_end(&F); It != Ie;) { Instruction *I = &*(It++); if (auto* op = dyn_cast<BinaryOperator>(I)) { IRBuilder<NoFolder>