similar to: [LLVMdev] Metadata for MachineInstr

In LLVM IR metadata is used to attach auxiliary information with various IR constructs. Currently metadata information is represented using MDNode and MDString. The metadata can refer to LLVM values but these references are not counted as regular "uses" of these values because metadata is maintained 'on the side'. This ensures that the optimizer is not influenced by auxiliary

On Jul 27, 2009, at 10:10 AM, Devang Patel wrote: > In LLVM IR metadata is used to attach auxiliary information with > various IR constructs. Currently metadata information is represented > using MDNode and MDString. The metadata can refer to LLVM values but > these references are not counted as regular "uses" of these values > because metadata is maintained 'on the

On Mon, Jul 27, 2009 at 1:13 PM, Dan Gohman<gohman at apple.com> wrote: > > On Jul 27, 2009, at 10:10 AM, Devang Patel wrote: > > >> In LLVM IR metadata is used to attach auxiliary information with >> various IR constructs. Currently metadata information is represented >> using MDNode and MDString. The metadata can refer to LLVM values but >> these

On Jul 27, 2009, at 3:05 PM, Devang Patel wrote: > On Mon, Jul 27, 2009 at 1:13 PM, Dan Gohman<gohman at apple.com> wrote: > >> >> >> On Jul 27, 2009, at 10:10 AM, Devang Patel wrote: >> >> >> >> >> >>> In LLVM IR metadata is used to attach auxiliary information with >>> >>> various IR constructs. Currently

Devang Patel wrote: > On Mon, Jul 27, 2009 at 9:31 PM, Nick Lewycky<nicholas at mxc.ca> wrote: > >> Why not have a named GlobalValue with an MDNode initializer? How is this >> different from what we had before? > > GlobalValue initializer accepts only Constants. So in my initial implementation, before I submitted it for review, I tried making them not be

I'm getting to the point where I want to contribute some more MachineInstr comment support for things like spills. As we've discussed before, we don't have all of the information available in AsmPrinter to synthesize the kind of comments that can be helpful for debugging performance issues with register allocators (our primary use for these kinds of comments). In order to get this

Devang Patel wrote: > In LLVM IR metadata is used to attach auxiliary information with > various IR constructs. Currently metadata information is represented > using MDNode and MDString. The metadata can refer to LLVM values but > these references are not counted as regular "uses" of these values > because metadata is maintained 'on the side'. This ensures that the

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

On Mon, Jul 27, 2009 at 9:31 PM, Nick Lewycky<nicholas at mxc.ca> wrote: > Why not have a named GlobalValue with an MDNode initializer? How is this > different from what we had before? GlobalValue initializer accepts only Constants. - Devang

Hi, I have a task to complete and I'm getting stuck. I can't find anything comparable in the documentation. The shortest explanation I can give is as follows: I need to use double-precision floating point values for floating-point multiplies. I'll not go into why: That would take the discussion away from the essential problem. E.g. Replace: fmuls %f20,%f21,%f8 with the

On Jul 31, 2009, at 11:17 AM, David Greene wrote: > I'm getting to the point where I want to contribute some more > MachineInstr comment support for things like spills. As we've > discussed before, we don't have all of the information available > in AsmPrinter to synthesize the kind of comments that can be > helpful for debugging performance issues with register

Hi all, A question about statically linking a pass to clang instead of dynamically loading it at runtime. I am stumped on this bug for a while. I inserted a pass under lib/Transforms/mypass directory, registered it with INITIALIZE_PASS and defined createMyPass in the pass. Also I added file mypass.h in include/llvm/Transforms/ to expose the accessor functions that expose my passes. Entries are

Hello. I am having difficulties to bundle MachineInstr instructions, before register allocation (RA). More exactly, I registered a simple pass in addPreRegAlloc() that is trying to create bundles. I see that it is written at http://llvm.org/docs/CodeGenerator.html#machineinstr-bundles: <<Packing / bundling of MachineInstr’s should be done as part of the register

On Thu, Oct 6, 2011 at 2:20 PM, Eli Friedman <eli.friedman at gmail.com> wrote: > On Thu, Oct 6, 2011 at 2:12 PM, Zeng Bin <ezengbin at gmail.com> wrote: >> Hi all, >> >> There might be a bug in DeadStoreElimination.cpp. This pass eliminates >> stores backwards aggressively in an end BB. It does not check dependencies >> on stores in an end BB though.

If int_guard_load returns a pointer based on the passed-in pointer, it captures it (at least according to the definition of "capture" which NoCapture uses). -Eli On Thu, Oct 6, 2011 at 2:26 PM, Zeng Bin <ezengbin at gmail.com> wrote: > It does not do anything. It is an abstract function which transforms a > pointer and returns another pointer of the same type. It does not

Hi,   1. Below code gives me end column number of the machine instruction.    How can I get the start column number ?   const MachineInstr *First; ..... //First is assigned. DebugLoc MIDB = First->getDebugLoc(); col_begin  = MIDB.getCol();   2. -----------------   If my C block is     {         int t = 10;      }   This gives me value 20, instead of 9. -----------------   3. In DebugLoc the

Hi, Recently, I am working on some information collection on the machine instruction (MachineInstr) level. But, sometimes, I need check the corresponding IR level instruction of the a machine instruction. When visiting a machine instruction which is a call (MachineInstr::isCall()), I need to check the arguments of this call site. I know that the CallSite class provides good facility for this

Hi all, I am really stumped on this problem. I googled and could not find any solution. Here is the problem. I compiled and installed glibc-2.5-20090518 in a local directory with gcc version 4.1.2. I compiled glibc-2.5 because I wanted to test glibc-2.5 on gcc first llvm-gcc. However, after I installed glibc, llvm-gcc does not work any more. It reported this error message:

It does not do anything. It is an abstract function which transforms a pointer and returns another pointer of the same type. It does not visit memory or capture the pointer parameter. On Thu, Oct 6, 2011 at 2:22 PM, Eli Friedman <eli.friedman at gmail.com> wrote: > On Thu, Oct 6, 2011 at 2:20 PM, Eli Friedman <eli.friedman at gmail.com> > wrote: > > On Thu, Oct 6, 2011 at

Hi I want to insert some functions into the llvm bitcode ir files. So I use IRBuilder and CreateCall(). But it how error : inlinable function call in a function with debug info must have a !dbg location. I don't know what DebugLoc should I give the new CallInst to setDebugLoc. I Create this CallInst , so this CallInst doesn't hava so-called "DebugLoc" mapping to the source