similar to: [LLVMdev] Scheduling - WAW Dependencies

Hi all, I am really stumped on a problem for long. I could not figure out why. That is why i am here. OK, here is the problem: I tried to insert a MachineBasicBlock into a function. Here is the code snippet: // insert a machine basic block with the error_label into MF and before I // Pred is the predecessor of the block to be inserted // the new basic block is inserted right before I void

Hi all, I am still stumped on the same bug. Did anyone try to insert MachineBasicBlock into a MachineFunction? Any advice will be appreciated. Thanks a lot in advance. ~Bin ---------------------------------------------------------------------------------------------------------------------------- Thanks a lot Jeff. I changed the setNumber function call to

Hi, while writing my register allocator, I have come across a case which confuses me because the llvm definition cannot be mapped to machine code. For instance I come across (1) and I reduce it to (2). However a copy instruction cannot move from EDX to CX. What mechanics in LLVM will tell me that I cannot make this move during register allocation, or how can I tell from (1) that I cannot execute

Hello, In llc, we have this flag (output of command --help | grep relax): -mc-relax-all - When used with filetype=obj, relax all fixups in the emitted object file It also appears in clang: -mrelax-all (integrated-as) Relax all machine instructions I'd like to discuss the naming and semantics of this flag, because ISTM at least the name is misleading. If I understand

Hi Eli, It's more of a debugging tool and stress test of the x86 branch relaxation than anything. It's definitely not intended to be an optimization. "relax-all" says to not just relax instructions that are strictly required, but to relax every instruction that can be relaxed, whether it's needed or not. I'm more inclined to remove the command line options entirely,

Hi ! I'm trying to modify the code in a machine function pass… I added a new basicblock and I want to add a jump to an another BB from my new BB. Here is my code : bool Obfuscation::runOnMachineFunction(MachineFunction &MF) { MachineBasicBlock *newEntry = MF.CreateMachineBasicBlock(); MF.insert(MF.begin(), newEntry); std::vector<MachineBasicBlock*> origBB;

Hi Julien, > On Oct 28, 2014, at 2:14 AM, Rinaldini Julien <julien.rinaldini at heig-vd.ch> wrote: > > Hum, in fact, I'm still a bit lost ;) > > It seems to works in -O0, but in -O1, -O2 and -O3, I got this error (+ the dump of the function): > > # Machine code for function foo: Post SSA > Function Live Ins: %RDI in %vreg7 > > BB#0: derived from LLVM BB

Hi Preston, Thank you for the prompt response. You can use DependenceAnalysis to get the info you want by expensively > testing all pairs of memory references. Isn't all pairs testing incorrect in the sense that a pair may only exist for a certain path? Consider the following example. A[i] = 42; // S1 if( condition ) // C1 { A[i] = 20; // S2 } B[i] = A[i];

For our helpdesk application, we need record full conversation between any caller and one or two helpdek numbers (while the conversation is running). After conversation is ended (hangup ..), the recorded file (WAW) is putted into database. Using AGI, record and put to database is OK, but only as exclusive task. But I need record WAW file "in background" the standard conversation.

On 07/29/2013 09:15 AM, Sven Verdoolaege wrote: > On Mon, Jul 29, 2013 at 07:37:14AM -0700, Tobias Grosser wrote: >> On 07/29/2013 03:18 AM, Sven Verdoolaege wrote: >>> On Sun, Jul 28, 2013 at 04:42:25PM -0700, Tobias Grosser wrote: >>>> Sven: In terms of making the behaviour of isl easier to understand, >>>> it may make sense to fail/assert in case

Hi Tobias and Sven, Thanks for your discussion and suggestion. @Sven: ISL actually allows users to have different identifiers with the same name. The problem that we have discussed is caused by incorrect usage of isl_space in Polly, so please do not worry about ISL library. You can skip the following information related to Polly implementation. @Tobias and Polly developers: I have attached

Hi, There have been a bunch of useful submissions for the compare /contrast thread. To reduce the load on your mailbox, they are gathered here in one go... Roger. Date: Wed, 28 Oct 1998 15:11:37 +0000 From: "David L. Sifry" <dsifry@linuxcare.com> To: "Matthew S. Crocker" <matthew@crocker.com> CC: Rob Bringman <rob@trion.com>,

Hi I want to analyse the memory dependencies which exist in a loop at an intra iteration as well as inter iteration (loop carried dependencies). I looked at the DependenceAnalysis implementation which returns a lot of the information I require (based on a prior AliasAnalysis pass), however I need to pass the Src and Dst instructions in program order. I was wondering how I can collect all the

Hi everyone, I am a LLVM newbie. I need to write a machinefunction pass for my project. This should be an analyzer of the machine code to do some profiling. I have written a couple of function passes for front end, but it seems they are completely different. I searched through forum and llvm documents, but couldn't find anything useful or questions were unanswered. Can anyone reference me to

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Hi Sebastian, Recently, I found the "Polly - Calculate dependences" pass would lead to significant compile-time overhead when compiling some loop-intensive source code. Tobias told me you found similar problem as follows: http://llvm.org/bugs/show_bug.cgi?id=14240 My evaluation shows that "Polly - Calculate dependences" pass consumes 96.4% of total compile-time overhead

The problem with vixie cron is wider (and more funny) than I expected. Here''s my proggy which allows hiding files of any kind and size into crontab entries (remember, quota is ignored ;-): -- cron_put -- #!/bin/bash echo "Vixie cron 3.0.1 file storage - put utlility" echo "by Michal Zalewski <lcamtuf@staszic.waw.pl>" echo if [ "$1" = "" ];

With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a pointer to the stack and it will OOPS. Copy the address to the heap to prevent the crash. Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang <jasowang at redhat.com> Cc: Laura Abbott <labbott at redhat.com> Reported-by: zbyszek at in.waw.pl Signed-off-by: Andy Lutomirski <luto at kernel.org> ---

With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a pointer to the stack and it will OOPS. Copy the address to the heap to prevent the crash. Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang <jasowang at redhat.com> Cc: Laura Abbott <labbott at redhat.com> Reported-by: zbyszek at in.waw.pl Signed-off-by: Andy Lutomirski <luto at kernel.org> ---

Dear John, Thank you so much for your help. I looked at those documents. Could you kindly answer the following questions: Does it mean that I have to make my own backend target in order to write a machine pass even if I want to run a simple machinefunction pass? for example,if I want my pass to get MIPS instructions as an input, I have to copy all the files from mips target and add a file to it