search for: allocaation

Hi Duncan, A DragonEgg/GCC-related question: do you know where these strange FRAME tokens originate from (e.g. %struct.FRAME.matmul)? Compiling simple Fortran code with DragonEgg: > cat matmul.f90 subroutine matmul(nx, ny, nz) implicit none integer :: nx, ny, nz real, dimension(nx, ny) :: A real, dimension(ny, nz) :: B real, dimension(nx, nz) :: C integer :: i, j, k real,

Hi LLVM folks, To properly implement pass-by-value in the Microsoft C++ ABI, we need to be able to take the address of an outgoing call argument slot. This is http://llvm.org/PR5064 . Problem ------- On Windows, C structs are pushed right onto the stack in line with the other arguments. In LLVM, we use byval to model this, and it works for C structs. However, C++ records are also passed this

Hi As shown below, the .\configure script found a version of alloca(): --------------------- configure:20831: checking for working alloca.h configure:20853: gcc -o conftest -g -O2 conftest.c -ldl >&5 configure:20856: $? = 0 configure:20859: test -s conftest configure:20862: $? = 0 configure:20873: result: yes configure:20883: checking for alloca configure:20925: gcc -o conftest -g -O2

Piotr Kaleta <piotrek.kaleta at gmail.com> writes: > I'm translating the source of stack-based virtual machine into LLVM IR and > my plan is to implement the stack in LLVM IR (using alloca/load/store) in > order to emulate the VM's stack and then use the optimization phase > "mem2reg". Therefore I'm going to have a stack pointer that points to the > top

Hi Alexandru, On 25/01/13 10:23, Alexandru Ionut Diaconescu wrote: > Thank you a lot for your response. I will try to use your approach with chasing > back along def-use chains to find instructions that define the registers used in > the load. Can you tell me please what class/methods/existing path are good for > this? I assume that I must have a method with arguments like the

I'm translating the source of stack-based virtual machine into LLVM IR and my plan is to implement the stack in LLVM IR (using alloca/load/store) in order to emulate the VM's stack and then use the optimization phase "mem2reg". Therefore I'm going to have a stack pointer that points to the top of my stack. I'm curious whether I will have to implement that in a

On 2/26/13 8:06 AM, Duncan Sands wrote: > Hi Justin, > >> an alloca outside of the entry block might be inside a loop, in >> which case the >> semantics are that it would allocate more stack space on every >> loop iteration. >> I think some of the optimizers that run later try to move allocas >> into the entry >> block if possible,

Hello Duncan, I compiled LLVM without optimizations (because maybe I have to look to memory accesses in the future). Maybe some of these optimizations I can enable when I am running my pass with opt ? It is still one thing that I don't understand. If the memory accesses will be eliminated, and I have the following situation: %i = alloca i32, align 4 %j = alloca i32, align 4 ..... %2 = load

According to comment in tree-nested.c, these frames should be only introduced in case of debug or OpenMP lowering: /* A subroutine of convert_nonlocal_reference_op. Create a local variable in the nested function with DECL_VALUE_EXPR set to reference the true variable in the parent function. This is used both for debug info and in OpenMP lowering. */ However, in this code example we

It's not great IR, but it doesn't look like it should actually crash, just (without SROA) produce comparatively bad code. The alloca is only referenced in the basic block that it exists. If this isn't expected to work, then we should probably improve the documentation of alloca in the language reference. David > On 5 Apr 2015, at 04:55, Eric Christopher <echristo at

How do you handle this during codegen? One problem is avoid stack changes (like spills). Another is coordinating things that are using allocas and those that are not but end up in the stack. Consider void foo(int arg1, int arg2, int arg3, ....CXXTypeWithCopyConstructor argn, int argp1...) You will need an alloca for argn, but the ABI also requires it to be next to the plain integers that

Full_Name: Eric van Gyzen Version: 2.1.0 OS: FreeBSD 5.4 Submission from: (NULL) (152.3.22.33) R-2.1.0 fails to compile on the newest release of FreeBSD, complaining about undefined references to __builtin_alloca. On FreeBSD, alloca() is declared in stdlib.h, not alloca.h as the R sources expect. Therefore, HAVE_DECL_ALLOCA does not get set, so the R sources declare alloca() after it has

I want to insert new alloca Instruction after existing alloca Instruction in llvm pass so what attribute to be passed at last in following newallocaI = new AllocaInst(llvm::Type::getInt32PtrTy(context,0), //type 0, // ArraySize 8, // Alignment

On Mon, 2003-06-16 at 17:33, John Criswell wrote: > What would be better yet is to modify the code so that it does not use > alloca() at all. There seems to be little reason to use it aside from > convenience (but perhaps I have missed something). I think the idea is that alloca can give (probably significant) performance gains when used properly. In the cases where you need

On Tue, Feb 26, 2013 at 5:42 AM, Duncan Sands <baldrick at free.fr> wrote: > Hi Vinod, > > > On 23/02/13 02:20, Vinod Grover wrote: > >> Sorry if this has been discussed before, but I would appreciate any >> pointers. >> I am trying to understand why mem2reg only looks at allocas in entry >> blocks, and >> not for any allocas in a function. One

In 3.1, the backend is very slow to legalize types. Following is the code snippet which may be the culprit: %Result.i.i.i97 = alloca i33, align 8 %Result.i.i.i96= alloca i33, align 8 %Result.i.i.i95 = alloca i33, align 8 %Result.i.i.i94 = alloca i33, align 8 %Result.i.i.i93 = alloca i33, align 8 %Result.i.i.i92= alloca i33, align 8 %Result.i.i.i91 = alloca i33, align 8

Are there any implicit assumptions about where alloca instructions can appear. I've got a failing test where the only difference between a passing test and a failing test is one application of this code in instcombine: // Convert: malloc Ty, C - where C is a constant != 1 into: malloc [C x Ty], 1 Seems pretty harmless to me. Later on the instcombine code does this: // Scan to the end of

To what do variable size LLVM alloca instructions get translated, when they are turned into machine code? I compiled a piece of code to bitcode and disassembled it. The disassembled code showed that there were alloca instructions with variable-sized parameters within the bitcode. When I turned the bitcode into machine code, I performed an nm on the result but didn't see any symbols

> I tried methods related to point 1) suggested by you, > but I still have problems of finding dependencies. > What exactly I want to do: > > I have a chain like : Alloca -> Load(1) -> ... -> Computation > where the variable might be changed -> Store(new_var) -> ... -> Load(n) Your example is not very clear. I don't understand what's involved in the

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 AFAIK, alloca.h is not POSIX. Here's a patch that includes alloca.h only when it's really there. It also includes malloc.h, which is where mingw-w64 defines the alloca() macro, mapping it to gcc __builtin_alloca() or to msvcrt _alloca(). - -- O< ascii ribbon - stop html email! - www.asciiribbon.org -----BEGIN PGP SIGNATURE----- Version: