similar to: [LLVMdev] Problem running program with LLVM JIT

Hi all, Can anybody tell me how to generate a mov instruction in llvm. I found out there is a MemMove Inst but I dont think that is what I want. I want to bypass a load instruction. So i need to generate a mov instruction which will help me remove the redundant load. Thanks -- Abhinav Karhu MS Computer Science Georgia Institute of Technology

I have compiled the program using the following option. llvm-gcc --emit-llvm Hello.c -o Hel.bc I have used llvm in the past but this sort of problem is new for me. I dont know how to go about it. Thanks for the reply. -- Abhinav Karhu MS Computer Science Georgia Institute of Technology

On Fri, Nov 14, 2008 at 2:13 PM, Karhu, Abhinav R <akarhu3 at gatech.edu> wrote: > > Hi all, > Can anybody tell me how to generate a mov instruction in llvm. I found out there is a MemMove Inst but I dont think that is what I want. > I want to bypass a load instruction. So i need to generate a mov instruction which will help me remove the redundant load. At the LLVM IL level,

r2->replaceAllUsesWith(r1); r2->eraseFromParent(); LLVM makes it easy! ;-) --Owen On Nov 15, 2008, at 11:02 PM, Karhu, Abhinav R wrote: > Hi owen, > Can you please elaborate as to what should I do? Find all the > instruction which have r2 in it and replace all of them with r1 and > then remove the load instruction? > Thanks > Abhinav > ----- Original Message

Hi owen, Can you please elaborate as to what should I do? Find all the instruction which have r2 in it and replace all of them with r1 and then remove the load instruction? Thanks Abhinav ----- Original Message ----- From: "Owen Anderson" <resistor at mac.com> To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu> Sent: Friday, November 14, 2008 11:22:32 PM

Hi Eli, I want to do redundant load elimination. A simple example for that would be load (a1) , r1; --- --- --- load (a2) , r2; Now if a1 and a2 are alias of each other and the value stored in a1 and a2 remains the same then I can say that the second load is redundant. I can replace the second load with these instructions mov r0 r1; mov r0 r2; and remove the load instruction. This is the thing

Hi all, I am facing new problem with lli now. I am having a sample code in which I am doing malloc for two variables. If I compile the code with normal gcc the program runs without any warning of any sorts. If I compile the program to convert it into a bytecode file and then run it through lli it segfaults and the program aborts. This is the stack trace after execution. lli((anonymous

hello all, If i have an IR instruction of the form %tmp10 = call sbyte* %malloc( uint 4 ) ; <sbyte*> [#uses=1] %tmp10 = cast sbyte* %tmp10 to int* ; <int*> [#uses=1] store int* %tmp10, int** %t which is nothin but a malloc call how can i get %tmp into maybe a variable set. If i have a store instruction then it is pretty much simpler as the getOperand(1) can give

Hey all, I am getting this weird error which suddenly popped up today. Whenever I am trying to execute a piece of code using lli I get this following error. Error loading program 'sample.bc': Invalid bytecode signature: 464C457F (Vers=0, Pos=4) I dont know what to do..Please reply to this question. Please... -- Abhinav Karhu MS Computer Science Georgia Institute of Technology

Hi Abhinav, > If i have an IR instruction of the form > %tmp10 = call sbyte* %malloc( uint 4 ) ; <sbyte*> [#uses=1] > %tmp10 = cast sbyte* %tmp10 to int* ; <int*> [#uses=1] > store int* %tmp10, int** %t > > which is nothin but a malloc call how can i get %tmp into maybe a variable > set. > > If i have a store instruction then it is

Hi Bill, Thanks a lot for your response.But my problem still remains.The thing is i am having a data type std::vector<Value*> as i am checking for the variables in Store Instructions and Malloc Instructions.For store the case is straightforward as discussed earlier.I want the same Value* variable for malloc inst as well. bcos i cannot have a different set for only instructions. can there be

On 7/23/07, abhi232 at cc.gatech.edu <abhi232 at cc.gatech.edu> wrote: > Hi Bill, > Thanks a lot for your response.But my problem still remains.The thing is i > am having a data type std::vector<Value*> as i am checking for the > variables in Store Instructions and Malloc Instructions.For store the case > is straightforward as discussed earlier.I want the same Value*

Hi, Is there a way to modify the string such as char a or char b? Could I use the way like "Replace an instruction with another Value" in Programm Manual? In fact, what I am interested in is string with visible expression, not all string, and I am trying to hide the orignal string by using simple way like XOR.. Is there a way to reorder the basic blocks? Thanks. Qiuyu C Source

hi, I want to know what is exact meaning in the following code. target endian-- %struct..TorRec-- %struct.TorRec-- implementation-- ;<sbyte>[#uses=1/0]-- how to explain them in details? Does anyone give me a guide? thanks yueqiang -------------------------------------------------------------- target endian = little target pointersize = 32 %struct..TorRec = type { int, void ()* }

In a code segment of my pass plugin, I try to gather AliasSets for all StoreInst, LoadInst and CallInst instructions in a function. Some behaviors of the pass puzzled me. Below is the *.ll of the test program which I run the pass on, it was get with "llvm-gcc -Wl,--disable-opt" from a rather simple *.c program. ---------------------------------- ; ModuleID = 'ptralias.bc'

On Tue, 2004-11-30 at 08:58, Chris Lattner wrote: > On Tue, 30 Nov 2004, Tanu Sharma wrote: > > > I have trouble using the llvm tools.Some of the errors are : > > > > $ llvm-dis prog.bc > > $ llvm-dis: Invalid Top Level Block Length! Type:1, Size:456 (Vers=0, Pos=12) > > Can you explain how you generated this bytecode file? It looks corrupted > or

Hey All, I am running into a problem with running the program using LLVM JIT. I get the following error. lli: error loading program 'Hel.bc': Bitcode stream should be a multiple of 4 bytes in length. Hel.bc is the bytecode for my simple HelloWorld program. Please give me some insight into this. Thanks -- Abhinav Karhu MS Computer Science Georgia Institute of Technology

I have an objective-c file, bar.m, that I try to process in the following way generating the error shown below. Any help would be appreciated. I suspect the error is in the first few lines of output. thanks, Todd > cfrontend-g++ -o bar.bc bar.m > llvm2cpp -o bar.cpp bar.bc > g++ -c bar.o bar.cpp > ld -o bar bar.o -l objc -l LLVMCore -l LLVMSupport -l LLVMSystem > ./bar Global

>Right. This looks like it's just a simple bug in llvm2cpp. >CppWriter.cpp:698 contains: > > if (CA->isString() && CA->getType()->getElementType() == >Type::SByteTy) { > Out << "Constant* " << constName << " = ConstantArray::get(\""; > printEscapedString(CA->getAsString()); > //

I am trying to symbolically execute LLVM assembly language. I found a possible semantic inconsistancy of the LLVM assembly language, or maybe my understanding is wrong. The C code is: #include <stdlib.h> 1 int f(void) 2 { 3 int a; 4 int *b = (int *) malloc(3*sizeof(int)); 5 a = 3; 6 return 0; 7 } I compile it with llvm-gcc 4 front end. The generated