|author||Nicolas Capens <email@example.com>||Thu Feb 04 17:00:08 2021 -0500|
|committer||Nicolas Capens <firstname.lastname@example.org>||Fri Feb 19 03:49:50 2021 +0000|
Propagate stores of stack addresses into other local variables Pointers to the base address of arrays often get stored and then loaded multiple time. This change adds an optimization pass to replace these loads with the result of the alloca of the array, and eliminates the allocas of the pointer variables. The PropagateAlloca unit test without this optimization produces: sub rsp,38h mov dword ptr [rsp+8],16h cmp ecx,0 je 000002543C4E407E lea rax,[rsp+8] mov qword ptr [rsp],rax mov rax,qword ptr [rsp] mov eax,dword ptr [rax] add rsp,38h ret With the optimization pass it becomes: sub rsp,38h mov dword ptr [rsp],16h cmp ecx,0 jne 0000015DC3B33074 mov eax,dword ptr [rsp] add rsp,38h ret Also add a couple of unit tests for corner cases where the propagation is not safe to perform. Bug: b/179279298 Change-Id: I784899319bf5360f47c6fbc22fb82134d135dbfc Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52468 Presubmit-Ready: Nicolas Capens <email@example.com> Tested-by: Nicolas Capens <firstname.lastname@example.org> Reviewed-by: Antonio Maiorano <email@example.com>
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: firstname.lastname@example.org
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.