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===========================
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OpenMP 21.0.0 Release Notes
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===========================
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.. warning::
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These are in-progress notes for the upcoming LLVM 19.0.0 release.
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
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============
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This document contains the release notes for the OpenMP runtime, release 19.0.0.
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Here we describe the status of OpenMP, including major improvements
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from the previous release. All OpenMP releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
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=================================================
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- Removed the "old" device plugins along with support for the ``remote`` and
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``ve`` plugins
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- Added basic experimental support for ``libc`` functions on the GPU via the
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`LLVM C Library for GPUs <https://libc.llvm.org/gpu/>`_.
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- Added minimal support for calling host functions from the device using the
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``libc`` interface, see this `example
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<https://github.com/llvm/llvm-project/blob/main/offload/test/libc/host_call.c>`_.
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- Fixed the implementation of ``omp_get_wtime`` for AMDGPU targets.
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- Added vendor agnostic OMPT callback support for OpenMP-based device offload.
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- Changed the OpenMP DeviceRTL to use 'generic' IR. The
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``LIBOMPTARGET_DEVICE_ARCHITECTURES`` CMake argument is now unused and will
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always build support for AMDGPU and NVPTX targets.
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- Updated the offloading entry format but retained backwards compatibility with
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the old format.
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- The LLVM_ENABLE_PROJECTS=openmp build mode has been removed.
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- Removed the standalone build mode. It is redundant with the runtimes default
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build.
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