similar to: [LLVMdev] Global variable-length array

On Apr 19, 2008, at 22:45, Talin wrote: > Suppose I have a global variable which points to a constant, > variable length array. This is somewhat contradictory. Do you want an 'vla *g;' in C? If so, your global will be of type %vla** (you'll load a pointer to the array from the global). Its initializer would be a bitcast of a global which has some type similar to %vla.

On Apr 19, 2008, at 7:45 PM, Talin wrote: > Question about "Pascal-style" arrays as mentioned in the reference > guide. > > Suppose I have a global variable which points to a constant, variable > length array. > > The question is, how can I assign an array of type "{ i32, [5 x > float]}" > to a global of type "{ i32, [0 x float]}"? From

Chris Lattner wrote: > On Apr 19, 2008, at 7:45 PM, Talin wrote: > > >> Question about "Pascal-style" arrays as mentioned in the reference >> guide. >> >> Suppose I have a global variable which points to a constant, variable >> length array. >> >> The question is, how can I assign an array of type "{ i32, [5 x >>

Let me clarify my question. I have a struct array h1 as follows: dhash h1[10]; I want to get a Constant* to variable h1. It looks like I can use ConstantStruct::get(StructType*, ArrayRef<Constant *>) to do this. My question is how to get the second argument of type ArrayRef<Constant *> from the above variable h1. Thanks, Chaitra ________________________________ From: Tim Northover

I'm trying to track down the problem with the assertion failure in SelectionDAGBuilder.cpp. This is the code: *case* *Intrinsic*::gcroot: *if* (GFI) { *const* Value *Alloca = I.getArgOperand(0); *const* Constant *TypeMap = cast<Constant>(I.getArgOperand(1)); * FrameIndexSDNode *FI = cast<FrameIndexSDNode>(getValue(Alloca).getNode());*

Here is the LangRef part of the patch. On Tue, Jan 12, 2010 at 2:11 PM, Chris Lattner <clattner at apple.com> wrote: > > On Jan 11, 2010, at 4:30 PM, Talin wrote: > > I'm working on a new version of the patch. >> >> Another thing I wanted to ask about - do you prefer to have one giant >> patch that has everything, or a series of incremental patches? I can

Hi I would like to initialize a global variable to the address of a function. Looking at how clang compiles the C code below, i see @main_ptr = global i8* bitcast (i32 ()* @main to i8*), align 8 but how do i generate i8* bitcast (i32 ()* @main to i8*), align 8 in LLVM IR and use it as initializer to a GlobalVariable. I know i will need to use the bitcast instruction. but as far i as i

On Tue, Jan 12, 2010 at 5:46 PM, Dan Gohman <gohman at apple.com> wrote: > > On Jan 12, 2010, at 5:01 PM, Talin wrote: > > > Here is the LangRef part of the patch. > > > +<p>The union type is used to represent a set of possible data types > which can > > + exist at a given location in memory (also known as an "untagged" > > +

I'm trying to create a GlobalVariable that is a ConstantArray. Id like each element to be a pointer to other things in the program(global variables, functions). So that they all have the same type Id like to make the elements void pointers. I think I am going about this wrong, heres how I am doing it: void writeArray(Module &M, GlobalVariable *shadow, Function *val,

Hi, I received an internal test case from a game team (it wasn't about this in particular), and I was wondering if there was maybe an opportunity to canonicalize a particular code pattern: %inputi = bitcast <4 x float> %input to <4 x i32> %row0i = and <4 x i32> %inputi, <i32 -1, i32 0, i32 0, i32 0> %row0 = bitcast <4 x i32> %row0i to <4 x float>

Hello, i need to fold constants, i found that a function ConstantFoldConstantExpression could be used, however I am not able to make it fold anything. Could you please give me some advice, what I am doing wrong? My code looks something like this: //data layout is obtained from clang-generated code for triple arm-none-linux-gnueabi with added v32:32:32 const char* const TARGET_DATA_LAYOUT =

On Jan 12, 2010, at 5:01 PM, Talin wrote: > Here is the LangRef part of the patch. > +<p>The union type is used to represent a set of possible data types which can > + exist at a given location in memory (also known as an "untagged" > + union). [...] This wording is somewhat misleading; memory in LLVM has no types. How about: "A union type describes an

Well, I am much happier now that I understand about dsymutil, and can actually step through my program in gdb. However, there are still some issues that are puzzling me. 1) First off, the debugger appears to stop at odd points. The IR for my main function looks correct to me: define i32 @"main(tart.core.Array[tart.core.String])->int"(%"tart.core.Array[tart.core.String]"*

I forgot to mention, that I use LLVM release 2.8, I did not try it with the latest revision, but I expect that I am rather doing something wrong than using non-implemented functions. On Tue, 15 Feb 2011 14:09:57 +0100, ihusar <ihusar at fit.vutbr.cz> wrote: > Hello, > > i need to fold constants, i found that a function ConstantFoldConstantExpression could be used, > however

>The type you pass to GlobalVariable's constructor for that variable should be "[10 x %struct.dlist]" because that's what you want storage for. Then the GlobalVariable itself will be a Constant of type "[10 x %struct.dlist]*". Yes, I verified that this is the case. I enabled assertions and the error seems to occur while creating GlobalVariable for both struct dhash

Ok, now it's arising another problem. IR code that I obtain is the following: i8* bitcast ([5 x i8] c"hello\00" to i8*) generated from instructions: ConstantExpr::getBitCast (ConstantDataArray::getString (getGlobalContext (), "hello"), PointerType::get (Type::getInt8Ty (getGlobalContext ()), 0)) but the LLC tool says: invalid cast opcode for cast from '[5 x i8]'

On Fri, Jan 15, 2010 at 11:02 AM, Dan Gohman <gohman at apple.com> wrote: > > On Jan 13, 2010, at 12:11 PM, Talin wrote: > > > > It depends on whether or not unions can be passed around as SSA values or > not. I can think of situations where you would want to. > > I'm skeptical that you *really* want to (i.e. that you wouldn't > be better off just

Adam, I just fixed this issue a few days ago. A version from the trunk should work for you. Cheers, Nadav -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of ihusar Sent: Tuesday, February 15, 2011 15:52 To: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] How to use ConstantFoldConstantExpression? I forgot to mention, that I use

I've been thinking about how to represent unions or "disjoint types" in LLVM IR. At the moment, the only way I know to achieve this right now is to create a struct that is as large as the largest type in the union and then bitcast it to access the fields contained within. However, that requires that the frontend know the sizes of all of the various low-level types (the

Hi, i am the main author of RV, the Region Vectorizer (github.com/cdl-saarland/rv). I want to share our standpoint as potential users of the proposed vector-length agnostic IR (RISC-V, ARM SVE). -- support for `llvm.experimental.vector.reduce.*` intrinsics -- RV relies heavily on predicate reductions (`or` and `and` reduction) to tame divergent loops and provide a vector-length agnostic