search for: omp

Displaying 20 results from an estimated 307 matches for "omp".

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2017 Dec 30
3
Issues with omp simd
I even tried following; int main(int argc, char **argv) { const int size = 1000000; float a[size], b[size],c[size]; #pragma omp simd for (int i=0; i<size; ++i) { a[i]=2; b[i]=3; c[i]=4; c[i]= a[i] + b[i]; } return 0; } but the output with and without openmp simd is same. why is that so? On Sun, Dec 31, 2017 at 12:01 AM, Craig Topper <craig.topper at gmail.com>...
2017 Dec 30
1
Issues with omp simd
i changed my code to following; #pragma omp simd for (int i=0; i<size; ++i) { a[i]=2; b[i]=3; c[i]=4; c[i]= a[i] + b[i]; printf("c value %f",c[i]); } still no effect of omp simd? On Sun, Dec 31, 2017 at 12:26 AM, Craig Topper <craig.topper at gmail.com> wrote: > Th...
2017 Dec 30
2
Issues with omp simd
hello, i am trying to optimize omp simd loop as follows int main(int argc, char **argv) { const int size = 1000000; float a[size], b[size],c[size]; #pragma omp simd for (int i=0; i<size; ++i) { c[i]= a[i] + b[i]; } return 0; } i run it using the following command;...
2015 Dec 02
2
clang only spawns one thread
Hi, I am using LLVM 3.6.1 to test the following code: #include <omp.h> #include <stdio.h> #include <stdlib.h> int main() { int tid, nthreads; #pragma omp parallel sections private(nthreads, tid) { #pragma omp section { tid = omp_get_thread_num(); printf("Hello, tid = %d\n ", tid); } #pragma omp section { tid =...
2012 Sep 28
11
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
Hi All, We'd like to make a proposal for OpenMP representation in LLVM IR. Our goal is to reach an agreement in the community on a simple, complete and extensible representation of OpenMP language constructs in LLVM IR. Hopefully, this would serve as a common ground and would enable further development of OpenMP support both in Clang and LLVM compiler toolchain. We seek feedback on the proposed design and ways to improve it. Main authors...
2012 Oct 02
0
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
...counts, but I'm more in the camp of Hal whose approach to tackling the parallelization foundation within LLVM [OpenMP just one aspect] makes more sense hitting that now by providing a clean and generic container without being hardwired to any one particular third party extension, ala the `complete and extensible representation of OpenMP.' Speaking from not having the necessary foundation to really sway either direction it just seems more the spirit of Hal's project would fall in-line, with what has been historically how Lattner and company prefer to keep LLVM as clean a desi...
2012 Oct 03
0
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
..., etc. if necessary? -Hal On Fri, 28 Sep 2012 22:42:37 +0400 Andrey Bokhanko <andreybokhanko at gmail.com> wrote: > Hi All, > > We'd like to make a proposal for OpenMP representation in LLVM IR. > > Our goal is to reach an agreement in the community on a simple, > complete and extensible representation of OpenMP language constructs > in LLVM IR. Hopefully, this would serve as a common ground and would > enable further development of OpenMP support both in Clang and LLVM > compiler toolchain. > > We seek feedback on the proposed design and ways to...
2016 Dec 08
6
[RFC] Enable "#pragma omp declare simd" in the LoopVectorizer
...GCC veclib is implemented based on GCC VectorABI for declare simd as well. For name mangling, we have to follow certain rules of C/C++ (e.g. prefix needs to _ZVG ....). David Majnemer who is the owner and stakeholder for approval for Clang and LLVM. Also, we need to pay attention to GCC compatibility. I would suggest you look into how GCC VectorABI can be extended support your Arch. Thanks, Xinmin -----Original Message----- From: Odeh, Saher Sent: Thursday, December 8, 2016 3:49 AM To: Tian, Xinmin <xinmin.tian at intel.com>; llvm-dev at lists.llvm.org; Francesco.Petrogalli...
2016 Dec 12
0
[RFC] Enable "#pragma omp declare simd" in the LoopVectorizer
...nted based on >GCC VectorABI for declare simd as well. > >For name mangling, we have to follow certain rules of C/C++ (e.g. prefix >needs to _ZVG ....). David Majnemer who is the owner and stakeholder for >approval for Clang and LLVM. Also, we need to pay attention to GCC >compatibility. I would suggest you look into how GCC VectorABI can be >extended support your Arch. > >Thanks, >Xinmin > >-----Original Message----- >From: Odeh, Saher >Sent: Thursday, December 8, 2016 3:49 AM >To: Tian, Xinmin <xinmin.tian at intel.com>; llvm-dev at li...
2016 Nov 30
5
[RFC] Enable "#pragma omp declare simd" in the LoopVectorizer
Dear all, I have just created a couple of differential reviews to enable the vectorisation of loops that have function calls to routines marked with “#pragma omp declare simd”. They can be (re)viewed here: * https://reviews.llvm.org/D27249 * https://reviews.llvm.org/D27250 The current implementation allows the loop vectorizer to generate vector code for source file as: #pragma omp declare simd double f(double x); void aa...
2020 Feb 14
4
About OpenMP dialect in MLIR
...de of things for OpenMP representation. MLIR can not only support operations for General Purpose languages like C,C++, Fortran, etc but also various Domain Specific Language representations as dialects (Example, ML, etc.). Note that there is also SPIR V dialect which is again meant for “Parallel Compute”. It becomes important to define the scope of the dialects / operations / types supported inside OpenMP operations in MLIR. > Assuming otherwise is not going to work. Analyzing a "generic" OpenMP > representation in order to determine if can be represented as a more &...
2012 Sep 28
0
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
...39;this is a parallel region'. There are obviously cases in which things need to be specific to the interface (like runtime loop scheduling in OpenMP which implies a specific interaction with the runtime library), but such cases may be the exception rather than the rule. We don't need 'omp' in the intrinsic names and also 'OMP_' on all of the string specifiers. Maybe, to my previous point, we could call the intrinsics 'parallel' and use 'OMP_' only when something is really OpenMP-specific? You don't seem to want to map thread-private variables onto th...
2020 Feb 13
6
About OpenMP dialect in MLIR
Hi, I have few questions / concerns regarding the design of OpenMP dialect in MLIR that is currently being implemented, mainly for the f18 compiler. Below, I summarize the current state of various efforts in clang / f18 / MLIR / LLVM regarding this. Feel free to add to the list in case I have missed something. 1. [May 2019] An OpenMPIRBuilder in LLVM was proposed for flang and clang frontends. Note that this proposal was befor...
2016 Jun 02
2
[cfe-dev] [Openmp-dev] RFC: Proposing an LLVM subproject for parallelism runtime and support libraries
...iven support from Mehdi, Renato, and especially Hal who has contributed > specifically in this area to LLVM as a whole, and no strong objections from > significant contributors (I feel like the primary concerns Intel raised have > been addressed, and we can keep working to make sure the libomptarget stuff > is integrated effectively), I think we should move forward. > > I understand that you still disagree with Hal and Mehdi here Chris, but I > don't think debating more in this thread is going to resolve anything. While > I'm still very interested in your feedback...
2018 Dec 12
2
[RFC] Re-implementing -fveclib with OpenMP
...art with the summary, to make sure the overall assumptions in the RFC match the ones I have about it, then we can delve into details. I also think we should not discuss user-include files now. Whatever we define for the standard ones will work for user driven ones, but user driven have additional complexities that will only get in the way of the standard discussion. Comments inline... On Wed, 12 Dec 2018 at 03:47, Francesco Petrogalli via llvm-dev <llvm-dev at lists.llvm.org> wrote: > Summary > ======= > > New `veclib` directives in clang I know this is not new but, why &quo...
2016 Feb 08
3
[cfe-dev] [lldb-dev] [3.8 Release] Release Candidate 2 source and binaries available
...sely > involved - I'm willing to do my best fixing any bugs which pop up - Hi Chris, That'd entail me enabling them for AArch64. I have to say, I've done that a few months ago and it all went smoothly, but I didn't know anyone was interested (and there were some failures in the OMP tests). I can enable them on the next release candidate and keep them on for the next releases, but I can't support it myself, so if you're willing to handle that, I'm ok with releasing them. Also, it's not trivial to run the OMP tests, making it a bit harder to monitor regression...
2020 Feb 15
5
[flang-dev] About OpenMP dialect in MLIR
...ext two constructs that we will do.” -- from a comment in latest RFC For the above mentioned reasons, I will try to restrict my reply to how the “parallel (do)” construct would be lowered. > If it is OK we can have further discussions in discourse as River points out. Given that the multiple components of the LLVM project, namely clang, flang, MLIR and LLVM are involved, llvm-dev is probably a better place, with a much wider audience, until it is clear how different components must interact. > It is the review for translation to LLVM IR that is in progress. > “If we decide that the...
2013 Dec 09
0
[LLVMdev] Update on OpenMP support in clang / llvm
...to OpenMP support in clang / llvm: * ANL (1) and Pathscale contributed OpenMP patch re-based from clang trunk (original version of the patch is based on clang 3.3 release). This is currently under code review, and will be committed to a separate repository: https://github.com/clang-omp/clang_trunk. Kudos to Hal Finkel, Chris Bergström and everyone from ANL and Pathscale who worked on this! * OpenMP consortium added clang to the list of OpenMP-enabled compilers: http://openmp.org/wp/openmp-compilers/. Obviously, as OpenMP patch still hasn't been commit...
2019 May 28
6
[RFC] Expose user provided vector function for auto-vectorization.
...l/llvm-dev/2018-December/128426.html). The previous RFC is to be considered abandoned. The original RFC was proposing to re-implement the `-fveclib` command line option. This proposal avoids that, and limits its scope to the mechanics of providing vector function in user code that the compiler can pick up for auto-vectorization. This narrower scope limits the impact of changes that are needed in both clang and LLVM. Please let me know what you think. Kind regards, Francesco ================================================================================= Introduction ==========...
2017 Jan 11
10
[RFC] IR-level Region Annotations
..., represent the directive/clause names using metadata and the remaining information using arguments. Here we're proposing (d), and below is a brief pros and cons analysis based on these discussions and our own experiences of supporting region/loop annotations in LLVM-based compilers. The table below shows a short summary of our analysis. Various commercial compilers (e.g. from Intel, IBM, Cray, PGI), and GCC [1,2], have IR-level representations for parallelism constructs. Based on experience from these previous developments, we'd like a solution for LLVM that max...