similar to: [LLVMdev] [cfe-dev] Question about UnreachableInst and exit() system call

I have the following C source: extern unsigned int donut; void f1(); void f2(); void f1() { unsigned int *magic = &donut; if (*magic != 286529877) { f2(); } } void f2() { /* Loop here forever if application is built with wrong version of ROM image */ while(1) { ; } } The -O2 level PruneEH pass uses SimplifyFunction() which contains this code: for

Hi Prakash, I don't know of an easy way to do this, other than to use random-access iterators so you can compute the distance between the edge and the beginning of the list of edges. Dan On Sep 16, 2008, at 2:58 PM, Prakash Prabhu wrote: > Hi Dan, > > Thanks for the reply. I got the labels for each outgoing edge (at the > source node's 'structure' field) working. Is

I've filed PR3043 for this. Evan On Nov 3, 2008, at 4:00 PM, Prakash Prabhu wrote: > Hi Evan, > > Thanks for the pointers. We found a simple test case that causes the > problem (thanks to Tom in my group): > > #include<stdio.h> > #include<stdlib.h> > > void test(); > void (*funcPtr)(); > > int main(int argc, char **argv) { > funcPtr =

Hi Prakash, Unfortunately it looks like you need to do quite a bit of investigation into this. However, I hope I can provide some useful tips. 1. In general, lli and llc generate exact the same code except lli default to static codegen while llc defaults to dynamic-no-pic codegen. So try passing -relocation-model=dynamic-no-pic to lli. If this works, that means there are issues with

Dear Prakash, Yes, DSA is still in active use, although nobody else uses the -ds-aa pass as far as I know. I tried the below sample (although ds-aa should be in libLLVMDataStructure.so and not libpoolalloc.so), and I get the same error. I've seen similar problems with other passes in our work here. My guess is that -ds-aa is requiring two passes that claim to invalidate each other; this

Dear Prakash, I believe I've fixed the problem you were having with ds-aa. Please update your poolalloc tree, recompile, and let me know if it works. -- John T. Criswell, John T wrote: > [snip] > > ________________________________________ > From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] On Behalf Of Prakash Prabhu [prakash.prabhu at gmail.com] > Sent:

On Tue, Oct 28, 2008 at 12:17 PM, Prakash Prabhu <prakash.prabhu at gmail.com> wrote: > Generating reference output from raw program: <cbe><gcc> > Error running tool: [snip] > /tmp/cc08IpX8.o: In function `SyLoadModule': > bugpoint-test-program.bc.cbe.c:(.text+0x25705): undefined reference to > `dlopen' [snip] This is saying that compilation with CBE is

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Same question here! On Jan 14, 5:14 pm, "Prakash Prabhu" <prakash.pra... at gmail.com> wrote: > Hi, > > Is there a way, from within an opt pass, to find the correspondence > between an LLVM IR object and Csourcecode(basicallylinenumber > info similar to the one used with gcc + gdb to help debugging ), > assuming either a llvm-gcc front end ? > > Sorry if

Hi Dan, Thanks for the reply. I got the labels for each outgoing edge (at the source node's 'structure' field) working. Is there a way to find out the outgoing edge number from EdgeIter. (Basically the Node in my graph has a a bunch of outgoing edges, so that I can just index into that collection within the node to get the appropriate edges' attributes). regards, Prakash On Tue,

Hello Prakash, The SelectionDAG viewers (llc -view-isel-dags etc.) support both multiple edges between the same pair of nodes, and labels at least for each incoming edge. See lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp for code you might use as an example, though it is a bit tricky. Dan On Sep 15, 2008, at 3:15 PM, Prakash Prabhu wrote: > Hi all, > > I have two questions related

Prakash Prabhu wrote: > Hi all, > > Would it be correct to say that the only instructions in LLVM IR that > modify/access memory potentially are the following: > I believe that every instruction has a mayWriteToMemory()/mayReadToMemory() method that you can use to determine this information. See http://llvm.org/doxygen/classllvm_1_1Instruction.html (the LLVM doxygen info on

On Wed, Aug 27, 2008 at 11:35 PM, Chris Lattner <clattner at apple.com> wrote: > > On Aug 27, 2008, at 3:04 PM, Prakash Prabhu wrote: > >> Hi Chris, >> >> Thanks for the reply. I am actually interested in using the Intervals >> Analysis mainly to be able to do Region based analysis. In fact, I >> found that the way Intervals are defined mirror exactly

Hi Evan, Thanks for the pointers. We found a simple test case that causes the problem (thanks to Tom in my group): #include<stdio.h> #include<stdlib.h> void test(); void (*funcPtr)(); int main(int argc, char **argv) { funcPtr = test; test(); } void test() { if(funcPtr == test) { printf("OK!\n"); } else { fprintf(stderr, "Bad!\n"); exit(1);

Hi Eli, Thanks for the reply. I tried with -Xlinker="-ldl ". However it does not seem to make a difference. It seems that when bugpoint is run with --run-jit, the linker args are not passed to gcc (from tools/bugpoint/ExecutionDriver.cpp) : if (InterpreterSel == RunLLC || InterpreterSel == RunCBE || InterpreterSel == CBE_bug || InterpreterSel == LLC_Safe) RetVal =

Hi Chris, Thanks for the reply. I am actually interested in using the Intervals Analysis mainly to be able to do Region based analysis. In fact, I found that the way Intervals are defined mirror exactly the definition of a Region in the second edition of the Dragon Book (Section 9.7 on Region-Based Analysis), so it will be great if the Intervals related code still lives on in LLVM :). I found

Prakash Prabhu wrote: > I am trying to add a new loop pass in which I making a call to get the > trip count of the loop using > > Value *TripCountValue = L->getTripCount() That should work. Could you file a bug and attach the bytecode after 'opt -indvars -loop-rotate'? I would need that to determine why LoopInfo::getTripCount isn't returning any value. Nick

On Aug 27, 2008, at 3:04 PM, Prakash Prabhu wrote: > Hi Chris, > > Thanks for the reply. I am actually interested in using the Intervals > Analysis mainly to be able to do Region based analysis. In fact, I > found that the way Intervals are defined mirror exactly the definition > of a Region in the second edition of the Dragon Book (Section 9.7 on > Region-Based Analysis),

Hi, I am trying to add a new loop pass in which I making a call to get the trip count of the loop using Value *TripCountValue = L->getTripCount() However I am always getting NULL for TripCountValue (confirmed through gdb). I am running this pass after the canonicalization of induction variables: opt --debug-pass=Structure -stats -indvars -loop-rotate -my-loop-pass < main.bc >

Thanks for the quick reply, Owen. I went through the code in MemoryDependenceAnalysis.cpp again. Since DenseMap<BasicBlock*, Value*> maps a BasicBlock to a single Value (Instruction) and it is populated by a DFS on the reverse Control Flow Graph starting at the query instruction's block, is it correct to say that the last dependent instruction in each visited basic block is what is