similar to: [LLVMdev] Alloca instructions in NON-entry block?

On 3/29/12 11:32 AM, Paul J. Lucas wrote: > The Kaleidoscope example here: > > http://llvm.org/docs/tutorial/LangImpl7.html#adjustments > > defines a CreateEntryBlockAlloca() helper function that "ensures that the allocas are created in the entry block of the function." > > It's kid of implied, but I thought I'd ask explicitly: *must* alloca instructions be

Hi all, I'm currently in the process of updating the Kaleidoscope tutorials (first and foremost, the ORC/BuildingAJIT ones), and I've noticed a fair few 404s which are lingering within the current visible documentation. Some of these don't seem to have linked to existing pages for a while. I was wondering if there was a way to set up a check in the buildbot to ensure that

hi, with LLVM 3.1, i am trying to compile toy.cpp from http://llvm.org/docs/tutorial/LangImpl7.html#code. i got the following error: $ clang++ -g toy.cpp `llvm-config --cppflags --ldflags --libs core jit native` -O3 -o toy toy.cpp:4:10: fatal error: 'llvm/IRBuilder.h' file not found #include "llvm/IRBuilder.h" i fixed this by modifying the broken line to: #include

Patrick, how long does the crawl take? I suspect if we fixed internal documentation links so that they point to local copies of documentation when building locally it would be quite quick (no actual idea though). That in turn would probably make it feasible to add to the existing documentation build bots, I think. James On Thu, 29 Aug 2019 at 03:47, Neil Nelson via llvm-dev < llvm-dev at

It is my understanding, the alloca memory routines are used for forcing variables to be allocated on the stack frame -- which you would want for source level debugging. When SSA registers are used, LLVM will decide what goes into registers and what will spill over to the stack frame. I want the latter. --w Wayne O. Cochran Assistant Professor Computer Science wcochran at vancouver.wsu.edu

The mem2reg pass will rewrite allocas and loads and stores to SSA virtual registers. Essentially it's a transformation from non-SSA to SSA form. That said, I don't know if you want your students to implement their own SSA transformation. Reid On Sat, Apr 23, 2011 at 1:57 PM, Cochran, Wayne Owen <wcochran at vancouver.wsu.edu> wrote: > It is my understanding, the alloca memory

On Nov 11, 2007, at 2:41 PM, Kelly Wilson wrote: > Hey Chris: > > Here are the diffs for the next few chapters of the tutorial that I > have > edited. Nice! You are an excellent editor, I'm impressed. I committed these without any changes here: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20071112/055566.html Thank you for the help with this. > Please

> If x is a local variable, it will be stored on the stack. So you need an > alloca for it: Aha, I remember this in Kaleidoscope tutorial. So, after the alloca %x can be modified freely (e.g. without adding suffix)? -- View this message in context: http://old.nabble.com/How-to-assign-a-constant-to-a-register--tp29987387p30016496.html Sent from the LLVM - Dev mailing list archive at

Hi Chris, Here are some diffs for the final three chapters of the Kaleidoscope tutorial. The changes are the same sort of changes as previous diffs. One question though....under the "Memory in LLVM" section of chapter 7 (mutable variables) there is a statement like this: The mem2reg pass implements the standard "iterated dominator frontier" algorithm... Should this read

Hi, I was trying to create a new *Store* instruction and inserting it to LLVM IR (.ll) file. I found the following constructor in LLVM Manual: StoreInst::StoreInst <http://llvm.org/docs/doxygen/html/classllvm_1_1StoreInst.html#aa2a72f9a51b317f5b4ab8695adf59025> (Value <http://llvm.org/docs/doxygen/html/classllvm_1_1Value.html> * Val, Value

Hi, If x is a local variable, it will be stored on the stack. So you need an alloca for it: %x = alloca i8 ; <i8*> Then you can just perform a store: Store i8* %x, i8 0 Cheers, James > -----Original Message----- > From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] > On Behalf Of leledumbo > Sent: 20 October 2010 14:39 > To: llvmdev at

On Fri, Apr 22, 2011 at 10:40 AM, Wayne Cochran <wcochran at vancouver.wsu.edu> wrote: > This is a simple SSA code generation 101 question. > > If I follow the IR code generation techniques in the Dragon book the > statement >  x = y + z > would translate into something like this in SSA/LLVM >  %0 = add %y, %z >  %x = %0 > Obviously "copy instructions"

Hi, I'm incrementing my toy compiler to account for variable mutations around if/else blocks. Reading the Kaleidoscope tutorial, I've learnt that I can substitute the PHI node creation by allocas and retrieving the value later, if needed. The Kaleidoscope example seems to account for one value only, the result of: Value *ThenV = Then->Codegen(); (...) Value *ElseV =

Dear All, Is it legal to have an alloca in a basic block other than a function's entry block? -- John T.

On Wed, Jul 2, 2008 at 10:07 AM, kapil anand <kapilanand2 at gmail.com> wrote: > Hi, > > I am using various LLVM optimization passes and I noticed a strange > behaviour in Mem2Reg Optimization. These pass is used for SSA construction > and basically removed alloca of the corresponding pointers are just used in > load/stores. > So, is there any restriction that all the

Okay, so I am on OSX, I am trying to install the LLVM library. Trying to compile their simple example (http://llvm.org/docs/tutorial/LangImpl7.html) I keep on getting a host of errors, the source of which is its not finding any of the included files ( #include "llvm/DerivedTypes.h" #include "llvm/ExecutionEngine/ExecutionEngine.h" #include

On Wed, Apr 20, 2011 at 2:54 PM, Jianzhou Zhao <jianzhou at seas.upenn.edu> wrote: > Hi all, > > I am trying to compile a high-level imperative OOP-like language to > the LLVM IR. Do we have any "generic" way of translating a non-SSA > form to the LLVM IR's SSA? There are lots of LLVM front-ends now. Do > they do such translation individually? or there is some

On Feb 11, 2009, at 4:07 AM, Alex wrote: > In my hardware there are two special registers cannot be copied but > can only be assigned and referenced (read) in the other instruction. > They are allocatable also. > > br i1 %if_cond, label %then, label %else > then: > %x1 = fptosi float %y1 to i32 > br label %endif > else: > %x2 = fptosi float %y2 to i32 >

--On Tuesday, September 19, 2017 9:57 AM -0700 John R Pierce <pierce at hogranch.com> wrote: > all it takes is one kid, who then shares his 'trick' with other kids, and > blam. Hire that kid to be head of security. :D

My understanding is that it is legal to have allocas in any basic block. However, the mem2reg pass only recognizes allocas in the entry block of a function as candidate for conversion into registers. So if you're hoping to use mem2reg, it won't work if you place your allocas elsewhere. -Srikumar