similar to: [LLVMdev] How to use Load/Store Instruction

But, the mem2reg pass removes all load store instructions. It replaces all variables by their if possible (kind of constant propagation). I have generated the bitcode of the source program and the applied the mem2reg pass and obviously not getting desired thing. What I want is convert it into SSA form without replacing any variable by their constant value. Please elaborate on your point. Also,

There is no existing pass to do this in LLVM, mostly because it wouldn't be useful for optimizing programs. From your input, mem2reg produces: define i32 @myfunc(i32 %x, i32 %y) nounwind { entry: %cmp = icmp sgt i32 %x, %y ; <i1> [#uses=1] br i1 %cmp, label %if.then, label %if.else if.then: ; preds = %entry %add = add

Suppose my Input function is like : myfunc(int x,int y){ int a=2, b=3,c=5; if(x>y) { c=a+b; a=6; } else { c=a*b; b=4; } a=c+a; c=a+b; } and the output should be : myfunc(int x,int y){ int a.0=2, b.0=3,c.0=5; if(x>y) { c.1=a.0+b.0; a.1=6; } else { c.2=a.0*b.0; b.1=4; }

Hi Jeffrey, Actually I am trying to implement "E-path PRE" which is based on non-algebric equivallence. So, the variable names need to be preserved. You said that I need to insert these to preserve variable %a.0 = bitcast i32 2 to i32 So, these need to be inserted before the mem2reg pass or within the pass. In first case, how to call an inbuilt pass after doing some analysis from my

You can use STOREs and LOADs on memory and then use mem2reg pass. 2010/6/1 Chayan Sarkar <chayan.ju at gmail.com>: > Hi, > > Can anyone tell me, whether it is possible to convert a program into > SSA form without considering algebric equivalence ? > > regards, > Chayan > _______________________________________________ > LLVM Developers mailing list > LLVMdev at

On Sat, Jun 5, 2010 at 2:03 AM, Chayan Sarkar <chayan.ju at gmail.com> wrote: > But, the mem2reg pass removes all load store instructions. It replaces > all variables by their if possible (kind of constant propagation). I > have generated the bitcode of the source program and the applied the > mem2reg pass and obviously not getting desired thing. > > What I want is convert

Hi, Can anyone tell me how to erase an instruction, (specially a load/store instruction) ? If I use Instr->eraseFromParent(), I get following error. Note the instruction does not have any use. opt: /home/chayan/llvm/llvm-2.6/include/llvm/ADT/ilist.h:218: llvm::ilist_iterator<NodeTy>& llvm::ilist_iterator<NodeTy>::operator++() [with NodeTy = llvm::Instruction]: Assertion

Hi, I could not figure out, how to declare a Pass*. Can anyone give me an example, how to use SplitEdge() function ? Please help me out. Regards, Chayan On Tue, Jul 20, 2010 at 10:12 AM, Chayan Sarkar <chayan.ju at gmail.com> wrote: > Hi All, > > Still I could not figure out how to use Pass* while calling > SplitEdge() function. Can anyone provide me some example? > >

Hi, Can anyone tell me, whether it is possible to convert a program into SSA form without considering algebric equivalence ? regards, Chayan

Hi All, Still I could not figure out how to use Pass* while calling SplitEdge() function. Can anyone provide me some example? Regards, Chayan On Sun, Jul 18, 2010 at 11:49 PM, Nick Lewycky <nicholas at mxc.ca> wrote: > Chayan Sarkar wrote: >> >> Hi, >> >> I have tried to use SplitEdge function, but failed. Actually the third >> parameter is a variable of

Simply create an undef constant value and add a store instruction to store the undef value into the memory allocated by the alloca. I believe there is an llvm::Undef class. Check doxygen docs for details. -----Original Message----- From: Chayan Sarkar <chayan.ju at gmail.com> Sent: Sunday, June 27, 2010 12:05 PM To: llvmdev at cs.uiuc.edu <llvmdev at cs.uiuc.edu>; chayan.ju at

E-path PRE requires the program in SSA form like SSAPRE algorithm. Then it finds the eliminatable path (e-path) for an expression and converts partially redundant to fully redundant and removes redundancy Chayan On Mon, Jun 7, 2010 at 1:58 PM, Eli Friedman <eli.friedman at gmail.com> wrote: > On Sun, Jun 6, 2010 at 8:56 PM, Chayan Sarkar <chayan.ju at gmail.com> wrote: >> Hi

On Sun, Jun 6, 2010 at 8:56 PM, Chayan Sarkar <chayan.ju at gmail.com> wrote: > Hi Jeffrey, > > Actually I am trying to implement "E-path PRE" which is based on > non-algebric equivallence. So, the  variable names need to be > preserved. Then why do you want to run mem2reg before your optimization in the first place? -Eli

Hi, I am trying to write a small pass. In my pass, I have inserted some instruction and used that in another. But, during OPT it is showing "Instruction does not dominate all uses" like following - %b.1 = bitcast i32 4 to i32 ; <i32> [#uses=8] %11 = add i32 %a.1, %b.1 ; <i32> [#uses=1]Instruction does not dominate all uses! Any

Chayan Sarkar wrote: > Hi, > > I am trying to write a small pass. In my pass, I have inserted some > instruction and used that in another. But, during OPT it is showing > "Instruction does not dominate all uses" like following - > > %b.1 = bitcast i32 4 to i32 ; <i32> [#uses=8] %11 > = add i32 %a.1, %b.1 ;

Chayan Sarkar wrote: > Hi, > > I have tried to use SplitEdge function, but failed. Actually the third > parameter is a variable of type Pass and it need to be non-null. But I > could not figure out how to use it. Please help me out. The only reason it needs a non-NULL Pass* is to call llvm::SplitBlock which uses P->getAnalysisIfAvailable unconditionally. Feel free to wrap

Hi, I have tried to use SplitEdge function, but failed. Actually the third parameter is a variable of type Pass and it need to be non-null. But I could not figure out how to use it. Please help me out. Regards, Chayan On Sat, Jul 17, 2010 at 10:16 PM, Nick Lewycky <nicholas at mxc.ca> wrote: > Chayan Sarkar wrote: >> >> Hi all, >> >> Suppose in a CFG bb1 has two

Hi, > thank for your answer. Is there any document/tutorial about linking > bytecode file with libstdc++ avaiable ? first you need to compile the bitcode to assembler using llc. For example: llc bitcode.bc This produces bitcode.s. Turn this into a executable using: llvm-g++ -o bitcode bitcode.s or g++ -o bitcode bitcode.s It doesn't matter which g++ you use here. Using g++

Hi there, I have written a PRE pass using LLVM. How can I test my pass? Is there any standard test-cases or bench-marks to test a pass. Please suggest accordingly. Regards, Chayan

Hello all, Suppose I have an Instruction like %1 = add i32 %a, %b and I want to convert it like %t = add i32 %a, %b and assign the value of %t to %1 (something like %1 <- %t ) how can I accomplish this? Regards, Chayan