similar to: [LLVMdev] How to cast an integer array to an integer pointer? (user question)

I am trying to create such module with API (it's equivalent to c++: const char* ss[] = {"s1","s2"};): @ss = global [2 x i8*] [i8* getelementptr inbounds ([3 x i8]* @.str1, i32 0, i32 0), i8* getelementptr inbounds ([3 x i8]* @.str2, i32 0, i32 0)] ; <[2 x i8*]*> [#uses=0] @.str1 = private constant [3 x i8] c"s1\00", align 1 ; <[3 x i8]*> [#uses=1]

I now understand that IndVarSimplify.cpp is capable of reproducing array references when the pointer initialization from the array address is found inside the immediately enclosing loop, such that in the following code: int A[20000], B[100], Z; int main() { int i, j, *a, *b; for ( a = &A[0], i = 0; i != 200; i++ ) for ( b = &B[0], j = 0; j != 100; j++

On Apr 29, 2008, at 1:27 AM, Gabor Greif wrote: > Hi all, > > I have reported more than enough about the space savings achieved > and the associated costs, here comes the current patch for review. > > Since this one is substantially smaller than the previous one, I did > not cut it in pieces. The front part is about headers and the rest > the .cpp and other files. Hi

Hi Johannes, > Now that reasoning works from a conceptual standpoint only for > non-inbounds GEPs, I think. From a practical standpoint my above > description will probably make sure everything works out just fine (see > also my rephrased answer down below!). I say this because I think the > following lang-ref passage makes sure everything, not only memory > accesses, involving

Hi, >>> I see. Is there a quick answer to the questions why you need inbounds >>> GEPs in that case? Can't you just use non-inbounds GEPs if you know you >>> might not have a valid base ptr and "optimize" it to inbounds once that >>> is proven? >> >> You mean on the Rust side? We emit GEPi for field accesses and array indexing.

I am trying to install R on Linux (Redhat 4). But 'yum' does not seem to work... thanks for your help/hints/suggestions in advance! ------------ $ sudo cat /proc/version Linux version 2.6.34.6-54.24.amzn1.i686 (mockbuild at build-31003.build) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Fri Sep 17 23:13:59 UTC 2010 $ sudo yum install

Dear all, the statistics package R (www.r-project.org) was available for CentOS-4, but I need it for CentOS-5 (64bit). RPMforge has R-2.5.1 for CentOS-4, so I thought I'd try to install that on CentOS-5. However, yum complains about missing ggv, and the specfile indeed says that R requires ggv, which is not in CentOS-5 (it has kghostview). I could probably install with "rpm -Uvh

Hi Johannes, > From the Lang-Ref statement > > "With the inbounds keyword, the result value of the GEP is undefined > if the address is outside the actual underlying allocated object and > not the address one-past-the-end." > > I'd argue that the actual offset value (here 0) is irrelevant. The GEP > value is undefined if inbounds is present and the

I am confused by this bit of code in instcombine: 09789 if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) { 09790 const Value *GEPI0 = GEPI->getOperand(0); 09791 // TODO: Consider a target hook for valid address spaces for this xform. 09792 if (isa<ConstantPointerNull>(GEPI0) && 09793

> On Dec 8, 2014, at 5:12 PM, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > > Partially answering my own question, in general these are not > equivalent because LLVM allows for pointers in different address > spaces to have different sizes. However, are they equivalent if > pointers in addrspace(1) have the same size as pointers in > addrspace(0)? > >

Hi, Is there any standard pass or something that can fuse chained GEPIs? I.e. turning b = getelementptr a, 10, 1 c = getelementptr b, 0, 3 d = getelementptr c, 0, 5 into: d = getelementptr a, 10, 1, 3, 5 In our case this would greatly simplify some analysis passes, at the moment we have to trace back a gepi-chain and extract all the indices manually (the original object is available

Hi, I am doing PCA on several columns of data in a data.frame. I am interested in particular rows of data which may have a particular combination of 'types' of column values (without any pre-conception of what they may be). I do the following... # My data table. allDat <- read.table("big_select_thresh_5", header=1) # Where some rows look like this... # PDB SUNID1

I'm using R 2.0 on Redhat Linux 9. When I try to produce PDF or PS output, the files are corrupted -- they won't open in Acroread, xpdf, ggv, and on attempting to convert to PNG, I get message "This file has corrupted %%EOF marker." Perhaps I am just doing something wrong. I did: > pdf() > hist(unlist(foo.bar)) I have no trouble viewing the output in Xwindows. Thanks,

John, I have looked at the SAFECode and thought following sould work if (isa<Constant>(I.getOperand(0))) { Out << "*** operand 0 is a constant ******"; if (Instruction *operandI = dyn_cast<Instruction>(I.getOperand(0))) { Out << "********operand is an instruction ****"; if (GetElementPtrInst *gepI =

Hi Johannes, >> So, the thinking here is: LLVM cannot exclude the possibility of an >> object of size 0 existing at any given address. The pointer returned >> by "GEPi p 0" then would be one-past-the-end of such a 0-sized object. >> Thus, "GEPi p 0" is the identitiy function for any p, it will not >> return poison. > > I don't see the

On 1/21/2011 10:46 PM, Surinder wrote: > John, > > I have looked at the SAFECode and thought following sould work > > if (isa<Constant>(I.getOperand(0))) > { Out<< "*** operand 0 is a constant ******"; > if (Instruction *operandI = dyn_cast<Instruction>(I.getOperand(0))) > { Out<<

The enlosed patch for IndVarSimplify.cpp works even when the pointer increment is deeply nested wrt pointer initialization, but note that it needs to have loop structures preserved, as in the following: int A[3000000], B[20000], C[100], Z; volatile int I, J, K; int main() { int i, j, k, *a, *b, *c; for ( a = &A[0], i = 0; i != 300; i++ ) { I++;

Hi, I'm looking for a usable PDF viewer with CentOS 4.3. On my previous install (Slack running XFCE with a handful of GNOME libs), I used Evince, which is just great. Looks like this is an Achilles' heel in CentOS, as I tested three available PDF viewers (ggv, gsview, acroread) with various PDF documents downloaded from the internet (which all display perfectly with Evince): either the

Hi. I've been running CentOS 4 since it was released (since 4.0). I did a fresh install and have kept it updated using up2date and yum so at present my system is running CentOS 4.2. I mostly use my system as a super-user and so I can mostly do everything without worrying too much about permissions. Not too long ago I created a "general" user account which is automatically logged

Hi. I mostly use my system as a super-user and so I can mostly do everything without worrying too much about permissions. Not too long ago I created a "general" user account which is automatically logged in after a few seconds for others to have (limited) access to the system. Mostly everything works (ie. CD/DVD writing, sound, floppy access, etc.) But when it comes to printing, only