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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 type Pass and it need to be non-null. But I...

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? > > Regards, > Chayan > > On Sun, Jul 18, 2010 at 1...

...e 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, what call an inbuilt pass from my own pass after doing some analysis. Thank you & regards, Chayan On Tue, Jun 1, 2010 at 10:59 PM, Ander Martinez <dwarfnauko at gmail.com> wrote: > 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 t...

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 gmail.com <chayan.ju at gmail.com> Subject: [LLVMdev] How to assign undef value to a variable Hi, Can any one tell me how to assign 'undef...

...reserve 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 own pass? In second case, how to change/modify an inbuilt pass? Please elaborate on this. Thank you, Chayan On Sun, Jun 6, 2010 at 1:32 AM, Jeffrey Yasskin <jyasskin at google.com> wrote: > 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) nounw...

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

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 Jeffrey, >> >> Actually I am trying to implement "E-path PRE" which is based on >>...

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 succesor bb3 and bb4, and bb3 has two >> predecessor bb1 and bb2. Now how can I insert a basic block between &gt...

...ame %add11 to %c.1 when it eliminates that store, which might make the optimized form a little easier to read. On the other hand, doing that would slow down mem2reg (I don't know how much), so it shouldn't be on by default. What are you really trying to do? On Sat, Jun 5, 2010 at 5:53 AM, Chayan Sarkar <chayan.ju at gmail.com> wrote: > 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...

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 li...

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...

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 `NodePtr && "++'d off the end of an ilist!"' failed. 0 opt 0x084560a8 Stack dump: 0. Running...

...c.2=a.0*b.0; b.1=4; } a.2=phi(a.1,a.0); b.2=phi(b.0,b.1); c.3=phi(c.1,c.2); a.3=c.3+a.2; c.4=a.3+b.2; } Thank you for your response. On Sat, Jun 5, 2010 at 3:03 PM, Eli Friedman <eli.friedman at gmail.com> wrote: > 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 p...

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...

..."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 idea, what is wrong with this? Regards, Chayan

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...

Hi, I am new to llvm. I have project in llvm. For that I need SSA form, which is already implemented in llvm. Basically I want to know which pass insert phi and converts it to SSA form in llvm . Regards, Chayan

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 obviousl...

Hi, Can any one tell me how to assign 'undef' to variable? I want to assign each variable an undef, immediately after the alloca instruction. Regards, Chayan

Hi all, Suppose in a CFG bb1 has two succesor bb3 and bb4, and bb3 has two predecessor bb1 and bb2. Now how can I insert a basic block between bb1 and bb3 that at the edge bb1-->bb3 . In general how can I insert a basic block on an edge? Regards, Chayan