search for: instructions

...t; Also i have used BinaryOperator::create(), but it gives error that there is no function called create(). Thanks again for your reply. John Criswell-2 wrote: > > 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 a...

...ction 'llvm::Instruction* StackerCompiler::get_stack_pointer(llvm::BasicBlock*, llvm::Value*)': StackerCompiler.cpp:432: error: no matching function for call to 'llvm::GetElementPtrInst::GetElementPtrInst(llvm::GlobalVariable*&, llvm::Value**, size_t)' /opt/src-llvm/include/llvm/Instructions.h:480: note: candidates are: llvm::GetElementPtrInst::GetElementPtrInst(llvm::Value*, llvm::Value*, const std::string&, llvm::BasicBlock*) /opt/src-llvm/include/llvm/Instructions.h:478: note: llvm::GetElementPtrInst::GetElementPtrInst(llvm::Value*, llvm::Value*, const std::string&, llvm::In...

...ps 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. Looking for a solution we have come across Puyan Lotfi's talk at 2018 EuroLLVM on mir-canon (https://www.youtube.com/watch?v=RHT-bh_xo6U). His project inspired us to invest some time into developing a tool called llvm-canon aiming to achieve a very similar goal - a clean and obvious diff but...

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 >&gt...

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 avoid performance penalty when switching between x86 AVX mode and SSE mode, e.g., when an AVX function calls a SSE function. My proposal: Default...

...---- 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 for each IR Instruction. To get a feel for what kind of output the CostModel pass gives, I ran it on the command line like so: $ cat test.c int main(){ int r = rand(); if (r > 1){ return ++r; } return r*86; } $ clang-3.6 -S -emit-llvm test.c -o test.bc $ opt-3.6 -anal...

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*...

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 pointing to the val...

...start (/home/mtech2/Documents/llvm/build/Debug+Asserts/bin/opt+0xec1739)* *Stack dump:* *0. Program arguments: opt -load /home/mtech2/Documents/llvm/build/Debug+Asserts/lib/CSE.so -CSE * *1. Running pass 'Function Pass Manager' on module '<stdin>'.* *2. Running pass 'Print Instructions' on function '@main'* *Aborted (core dumped)* Any help will be appreciated. - Ansar K.A. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20151126/b4eac8e7/attachment.html>

...but it gives error that there is > no function called create(). > > Thanks again for your reply. > > > John Criswell-2 wrote: >> >> 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...

...error that there is > no function called create(). > > Thanks again for your reply. > > > John Criswell-2 wrote: > >> 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...

...hich 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 > useful to represent arbitrary sequence of instructions that must be scheduled as > a unit. e.g. ARM Thumb2 IT block, Intel compare + branch macro-fusion, or random > instruction sequences that are currently modeled as pseudo instructions that are > expanded late. The concept of a "VLIW bundle" is to mark a set of instructions that s...

> 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 Develop...

...actors SLOWER than even Microsoft's NOTORIOUS POOR implementation of 64-bit division shipped with MSVC and Windows! The reasons: 1. subroutine matroschka, 2. "C" implementation! JFTR: the target processor "i386" (introduced October 1985) is a 32-bit processor, it has instructions to divide 64-bit integers by 32-bit integers, and to multiply two 32-bit integers giving a 64-bit product! I expect that a library written 20+ years later takes advantage of these instructions! __divsi3 (18 instructions) perform a DIV after 2 calls of abs(),...

...ocessor I'm working with has a single conditional branch instruction, JCC, that takes an IP-relative 9-bit immediate offset as operand. A second version of the instruction takes a register as operand and can therefore jump to any 32-bit address. In AsmBackend, there are methods for relaxing instructions, that I wanted to use to replace "JCC imm9" instructions with a sequence of instructions that jumps further. However, I have two questions: - relaxInstruction does not seem to be able to replace one instruction with a sequence of instructions - I've looked at many other LLVM backe...

...Yes, the Instruction class has a method for doing this (the method is technically inherited from the Value class). Calling the replaceAllUsesWith() method on an Instruction will replace every use of the old instruction with the new instruction. As long as the type generated by the old and new instructions is identical (or maybe even similar), you shouldn't have any problems. For example, replacing an add instruction that adds two i32's with a call instruction that returns an i32 should be as simple as: Instruction * OldInst = ... ; Instruction * NewInst = CallInst::Create (...); OldInst-&g...

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: > > Nipun Arora wrote: >> Hi, >> >> How can one extract the operand of an instruction in an LLVM pass...

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 patternDC::runOnBasicBlock(BasicBlock &BB) { > ... > if (...