similar to: [LLVMdev] Analysis Passes

On Jul 25, 2008, at 10:56 AM, Marc de Kruijf wrote: > Could somebody please explain exactly what an "analysis pass" is? > I've spent some time trying to understand this and I just don't get > it. Right now my understanding is the following: if a pass is an > "analysis" pass, the "print" function is called when giving the "- >

I'd like to write a pass that does both: implements a code transformation *and *saves information that can be accessed by subsequent passes. If such a pass is not an Analysis pass and that therefore subsequent passes are not supposed to use getAnalysis() to extract the information from that pass... what is the right way to do this? Right now I am using getAnalysis to get the information from

On Jul 25, 2008, at 12:58 PM, Marc de Kruijf wrote: > I'd like to write a pass that does both: implements a code > transformation and saves information that can be accessed by > subsequent passes. Ideally, we want to use two separate pass. However, it is quiet possible that your requirement is unique. Would it be possible to provide more info. on what your pass does ? >

Devang Patel wrote: > On Jul 25, 2008, at 12:58 PM, Marc de Kruijf wrote: > > I'd like to write a pass that does both: implements a code transformation and saves information that can be accessed by subsequent passes. > > Ideally, we want to use two separate pass. However, it is quiet possible that your requirement is unique. Would it be possible to provide more info. on what

Hi, I try to use MemoryDependenceAnalysis in a pass to analyse a simple function: void fct (int *restrict*restrict M, int *restrict*restrict L) { S1: M[1][1] = 1; S2: L[2][2] = 2; } When I iterate over MemoryDependenceAnalysis on the S2 statement, I get the load instruction for the first depth of the array, that’s ok. But I get also the load and store for the S1 statement. I assume the

add -basicaa to your command line :) On Mon, May 11, 2015 at 7:15 AM, Willy WOLFF <willy.mh.wolff at gmail.com> wrote: > I play a bit more with MemoryDependenceAnalysis by wrapping my pass, and > call explicitely BasicAliasAnalysis. Its still using No Alias Analysis. > > How can I let MemoryDependenceAnalysis use BasicAliasAnalysis? > > Please, find attached my pass. >

I think it would make sense for (1) and (2). I am not sure if (3) is feasible in instcombine. (I am not too familiar with LoopInfo) For the Octasic's Opus platform, I modified shouldMergeGEPs in our fork to: if (GEP.hasAllZeroIndices() && !Src.hasAllZeroIndices() && !Src.hasOneUse()) return false; return Src.hasAllConstantIndices(); // was return false;

Hi Mark, It is not clear to me at all that preventing the merging is the right solution. There are a large number of analysis, including alias analysis, and optimizations that use GetUnderlyingObject, and related routines to search back through GEPs. They only do this up to some small finite depth (six, IIRC). So reducing the GEP depth is likely the right solution for InstCombine (which has the

Hi, List, As you may know, BCC of android makes use of LLVM's major components. Its LTO actually selects some optimizations of LLVM. I found it can not only use "-functionattrs". I must first use -argpromotion first, or I end up this error: Pass 'Deduce function attributes' is not initialized. Verify if there is a pass dependency cycle. Required Passes: bcc:

On May 6, 2010, at 6:32 PM, ether zhhb wrote: > As the comment said: > /// The IndVarSimplify pass transforms loops to have a form that > this > /// function easily understands. > > you could try -indvars. After adding -indvars to the opt command, getTripCount still returns null. I suppose it's possible, depending on the scheduling of the pass manager, that

0 down vote favorite <http://stackoverflow.com/questions/34049511/how-to-pass-optimization-passes-to-clang#> I'm trying to debug an issue for a new target where a testcase fails with -O1 optimization and passes with -O0 optimization. I got a list of optimization passes being performed when 'clang -O1' is called like this: llvm-as < /dev/null | opt -O1 -disable-output

Does LLVM have loop multiversioning ? it seems it does not with clang++ -O3 -mllvm -debug-pass=Arguments program.c -c bash-4.1$ clang++ -O3 -mllvm -debug-pass=Arguments fast_algorithms.c -c clang-3.6: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated Pass Arguments: -datalayout -notti -basictti -x86tti -targetlibinfo -no-aa -tbaa -scoped-noalias

Hi, In following link: https://www.youtube.com/watch?reload=9&v=6X12D46sRFw They have specified that the inliner can't use DomTree/LoopInfo/MemorySSA analysis. 1. What's the reason for this? 2. Why can't we do it using getAnalysisUsage() construct? 3. Can inline use this information in the new Pass Manager? 4. What all information can we derive from DomTree to be of help to

Hi, I'm a PhD student doing phase ordering as part of my PhD topic and I would like to ask some questions about LLVM. Executing the following command to see what passes does OPT execute when targeting a SPARC V8 processor: /opt/clang+llvm-3.7.1-x86_64-linux-gnu-ubuntu-15.10/bin/llvm-as < /dev/null | /opt/clang+llvm-3.7.1-x86_64-linux-gnu-ubuntu-15.10/bin/opt -O3 -march=sparc -mcpu=v8

On Dec 7, 2007, at 1:43 AM, Wojciech Matyjewicz wrote: > Recently, I was looking into the bug #1227. I wanted to check if > reordering optimization passes could solve it. To start with, I > tried to > reproduce the output of llvm-g++ -O3 using the combination of llvm-g++ > -O0 and opt with the appropriate passes. However, I was unable to. I > use > SVN versions of llvm and

Dear All, I'm having some problems using a function pass from a Module pass. My code is as follows: DominatorTree & domTree; ... Function &F = *I; // I is an interator from using Module::begin() ... domTree = getAnalysis<DominatorTree>(F); When I compile this code, I get the following error: /home/vadve/criswell/src/llvm22/include/llvm/Pass.h: In member function

Hi, Recently, I was looking into the bug #1227. I wanted to check if reordering optimization passes could solve it. To start with, I tried to reproduce the output of llvm-g++ -O3 using the combination of llvm-g++ -O0 and opt with the appropriate passes. However, I was unable to. I use SVN versions of llvm and llvm-gcc-4.2. First, I compile example.cpp (attached; taken from the bug #1227) with: $

On Mon, May 09, 2016 at 01:07:07PM -0700, Mehdi Amini via llvm-dev wrote: > > > On May 9, 2016, at 10:43 AM, Ricardo Nobre via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > > > Hi, > > > > I'm a PhD student doing phase ordering as part of my PhD topic and I would like to ask some questions about LLVM. > > > > Executing the following

Interesting that we're getting a relative flood of these recently. See here: http://lists.llvm.org/pipermail/llvm-dev/2019-March/131346.html I don't think one can reliably get a Function analysis pass from within a ModulePass using the legacy pass manager. You have to manually construct the pass yourself. -David Jonathan Smith via llvm-dev <llvm-dev at

On Thu, Dec 4, 2008 at 7:08 PM, Chris Lattner <clattner at apple.com> wrote: > > On Dec 4, 2008, at 8:58 AM, Villmow, Micah wrote: > > What optimization pass promotes 32 bit math operations to 64 bit operations > so I can disable it? I have code that works fine with optimizations turned > off but fails with it turned on because of this stage. > > > Do you have a