|author||Nicolas Capens <email@example.com>||Sat Feb 06 00:35:38 2021 -0500|
|committer||Nicolas Capens <firstname.lastname@example.org>||Mon Feb 22 18:25:02 2021 +0000|
Implement propagation of stores to loads in single basic blocks For loads following stores in the same basic block, replace their result with the data that was stored. It transforms the output of the StoresInMultipleBlocks test from: sub rsp,38h mov dword ptr [rsp],0Dh cmp ecx,0 je a mov dword ptr [rsp],4 add dword ptr [rsp],3 b: mov eax,dword ptr [rsp] add rsp,38h ret a: mov dword ptr [rsp],6 add dword ptr [rsp],5 jmp b Into: sub rsp,38h mov dword ptr [rsp],0Dh cmp ecx,0 je a mov dword ptr [rsp],4 mov eax,4 add eax,3 mov dword ptr [rsp],eax b: mov eax,dword ptr [rsp] add rsp,38h ret a: mov dword ptr [rsp],6 mov eax,6 add eax,5 mov dword ptr [rsp],eax jmp b While at first this might seem like a regression, note that `add [rsp],3` performs both a load and a store. The optimization pass eliminated two load operations from this test. The redundant stores will be eliminated by a subsequent change. Also adds a unit test for the case where store-to-load propagation should not be performed due to an indirect store through a pointer happening in between. Bug: b/179668593 Change-Id: I6ca133ac4e77bbbc3efd517dff6e8dee6d2dc147 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52533 Kokoro-Result: kokoro <email@example.com> Tested-by: Nicolas Capens <firstname.lastname@example.org> Presubmit-Ready: Nicolas Capens <email@example.com> Reviewed-by: Antonio Maiorano <firstname.lastname@example.org>
SwiftShader is a high-performance CPU-based implementation of the Vulkan graphics API12. Its goal is to provide hardware independence for advanced 3D graphics.
NOTE: SwiftShader's OpenGL ES frontend is no longer supported, and will eventually be removed. Read more about our recommendation to use ANGLE on top of SwiftShader Vulkan here.
SwiftShader libraries can be built for Windows, Linux, and macOS.
Android and Chrome (OS) build environments are also supported.
cd build cmake .. cmake --build . --parallel ./vk-unittests
Tip: Set the CMAKE_BUILD_PARALLEL_LEVEL environment variable to control the level of parallelism.
To build the Vulkan ICD library, use Visual Studio 2019 to open the project folder and wait for it to run CMake. Open the CMake Targets View in the Solution Explorer and select the vk_swiftshader project to build it.
The SwiftShader libraries act as drop-in replacements for graphics drivers.
On Windows, most applications can be made to use SwiftShader's DLLs by placing them in the same folder as the executable. On Linux, the
LD_LIBRARY_PATH environment variable or
-rpath linker option can be used to direct applications to search for shared libraries in the indicated directory first.
In general, Vulkan applications look for a shared library named
vulkan-1.dll on Windows (
vulkan-1.so on Linux). This ‘loader’ library then redirects API calls to the actual Installable Client Driver (ICD). SwiftShader's ICD is named
libvk_swiftshader.dll, but it can be renamed to
vulkan-1.dll to be loaded directly by the application. Alternatively, you can set the
VK_ICD_FILENAMES environment variable to the path to
vk_swiftshader_icd.json file that is generated under the build directory (e.g.
.\SwiftShader\build\Windows\vk_swiftshader_icd.json). To learn more about how Vulkan loading works, read the official documentation here.
See CONTRIBUTING.txt for important contributing requirements.
The canonical repository for SwiftShader is hosted at: https://swiftshader.googlesource.com/SwiftShader
Authenticate your account here: https://swiftshader-review.googlesource.com/new-password
All changes require a Change-ID tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at: https://gerrit-review.googlesource.com/tools/hooks/commit-msg. To clone the repository and install the commit hook in one go:
git clone https://swiftshader.googlesource.com/SwiftShader && (cd SwiftShader && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)
Changes are uploaded to Gerrit by executing:
git push origin HEAD:refs/for/master
Some tests will automatically be run against the change. Notably, presubmit.sh verifies the change has been formatted using clang-format 10.0. Most IDEs come with clang-format support, but may require downgrading to clang-format version 10.0.
SwiftShader's OpenGL ES implementation can be tested using the dEQP test suite.
See docs/dEQP.md for details.
The third_party directory contains projects which originated outside of SwiftShader:
llvm-subzero contains a minimized set of LLVM dependencies of the Subzero project.
googletest contains the Google Test project, as a Git submodule. It is used for running unit tests for Chromium, and Reactor unit tests. Run
git submodule update --init to obtain/update the code. Any contributions should be made upstream.
Public mailing list: email@example.com
The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in LICENSE.txt.
Files in the third_party folder are subject to their respective license.
The legal authors for copyright purposes are listed in AUTHORS.txt.
CONTRIBUTORS.txt contains a list of names of individuals who have contributed to SwiftShader. If you‘re not on the list, but you’ve signed the Google CLA and have contributed more than a formatting change, feel free to request to be added.