search for: instructs

Thanks for reply. I have used AllocaInst, it's working but i think it's only for allocating some memory for new variable. And CallInst creates a call instruction. I am looking for creating a add or sub instruction. I used function instruction(), which gives me error "error: cannot allocate an object of abstract type ‘llvm::Instruction’" and also "Instruction.h:28: note:

Hi, I'm new to LLVM, and I'm trying to get things set up. So far I've successfully gotten the C and C++ frontends to run, using the pre-compiled Mac OS X PPC binaries. I've also successfully compiled the main LLVM package (minus the gcc frontend). I'm now trying to get the Stacker sample project to compile. I checked out the Stacker directory from svn, and put it in my

Hi all, Many of us find ourselves spending a great chunk of time comparing LLVM IR dumps at various stages of compilation pipeline or after a given optimization pass. Said process can be extremely laborious, and this is especially true when comparing shaders or compute modules. Important semantic differences are often difficult to spot because of the irregular naming and ordering of instructions.

Can you please give an example of creating an instruction (for example add instructions with two operand a and b)? I am trying instruction() for a while, but no success yet. Duncan Sands wrote: > > Hi, > >> Actually i have to implement strength reduction, for that i have to first >> detect induction variables using ALLEN-COCKE-KENNEDY algorithm. To find >> out

Hi all, I would like to make a proposal about changing the optimization strategy regarding when to insert a vzeroupper instruction in the x86 backend. Current implementation: vzeroupper is inserted to any functions that use AVX instructions. The insertion points are: 1) before a call instruction; 2) before a return instruction; Rationale: vzeroupper is an AVX instruction; it is inserted to

Sorry if double posted... might have sent this to old mailing list address... ---------- Forwarded message ---------- From: Stephen Thomas <stephen.warner.thomas at gmail.com> Date: Wed, Aug 5, 2015 at 10:39 AM Subject: How to use CostModel? To: LLVM Dev <llvmdev at cs.uiuc.edu> Hi, I'm trying to use the built-in CostModel class to estimate the number of machine instructions

Hello, I am a beginner of LLVM. I am trying to move among the instructions of a BasicBlock and I cannot. In this particular example, I try to get the previous instruction of the end instruction. I am trying 2 methods: 1. I have the following sequence of code: bool patternDC::runOnBasicBlock(BasicBlock &BB) { ... if (BB.getTerminator()) { Instruction* current =

help__me_please wrote: > Can you please give an example of creating an instruction (for example add > instructions with two operand a and b)? I am trying instruction() for a > while, but no success yet. > You need to look for the appropriate subclass of llvm::Instruction and find the method for creating a new instruction. The method is usually a static method and takes arguments

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

There's an entire tutorial at http://llvm.org/docs/tutorial which includes covers the IRBuilder to generate all sorts of IR, including the add instruction. You can skip ahead to chapter 3 if you just want to see LLVM API, but I suggest you read the whole tutorial if you have the time. Nick help__me_please wrote: > > Thanks for reply. > I have used AllocaInst, it's working but

help__me_please wrote: > Thanks for reply. > I have used AllocaInst, it's working but i think it's only for allocating > some memory for new variable. And CallInst creates a call instruction. I am > looking for creating a add or sub instruction. > > I used function instruction(), which gives me error "error: cannot allocate > an object of abstract type

Hi, I'm glad to see some action with regard to static instruction scheduling and VLIW support in LLVM. I have some questions and remarks which might not be relevant as I'm not totally familiar with the current code generation framework of LLVM nor your plan. On 12/02/2011 10:40 PM, Evan Cheng wrote: > 2. It must be flexible enough to represent more than VLIW bundles. It should be >

> No. Bundles with single instructions are not allowed, but bundles can be > mixed with instructions that are not bundled. > > -Krzysztof > > -- > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted > by The Linux Foundation > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org >

Hi @ll, LLVM-7.0.0-win32.exe contains and installs lib\clang\7.0.0\lib\windows\clang_rt.builtins-i386.lib The implementation of (at least) the multiplication and division routines __[u]{div,mod,divmod,mul}[sdt]i[34] shipped with this libraries SUCKS: they are factors SLOWER than even Microsoft's NOTORIOUS POOR implementation of 64-bit division shipped with MSVC and Windows! The reasons: 1.

Hello, I'm working on an LLVM backend for an experimental microprocessor. Work is going on nicely, and I've until now found the answer to all my questions directly in the LLVM source code, or in the documentation. However, I'm having problems with the AsmBackend class and the handling of fixups. The processor I'm working with has a single conditional branch instruction, JCC,

Ralf Karrenberg wrote: > Hello everyone, > > is there any way to replace an instruction inside LLVM that is more > elegant than creating a new one, replacing uses and deleting the old one > if I only want to modify the type? It is generally not a big deal, but > the issue gets really messy if I am in the middle of iterating over uses > and start deleting some of them... >

Can anyone tell how to get the result name or instruction name of all instruction? For example if the instruction is "x=add y,z", here i need "x". Using getName(), i am getting some instructions result name, but llvm produces some instruction like "%0=add i32 tmp, 1", here getName() shows empty string as result name. So please help. John Criswell wrote: > >

Dear All, Given a pointer to an instruction, what is the easiest way to insert one or more new instructions after that instructions? We used to find the next instruction using Instruction::getNext(), but this method seems to have been made private now. -- John T.

Hello all, I am at the adding Instruction Set stage of adding new target support into LLVM. There is a single instruction op mnemonic with multiple operand forms. For example: Add R1, R2 & Add @R1, R2. I found that there is similar case in x86 instruction set, such like ADD reg, reg & ADD mem, reg. However, the solution of x86 is adding suffix of instruction and translating instruction op

On 12/17/12 10:34 AM, Alexandru Ionut Diaconescu wrote: > Hello, > > I am a beginner of LLVM. I am trying to move among the instructions of > a BasicBlock and I cannot. In this particular example, I try to get > the previous instruction of the end instruction. I am trying 2 methods: > > > > 1. I have the following sequence of code: > > bool