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| author | Joseph Huber <jhuber6@vols.utk.edu> | 2023-06-19 03:25:37 -0500 |
|---|---|---|
| committer | Joseph Huber <jhuber6@vols.utk.edu> | 2023-06-19 03:25:51 -0500 |
| commit | 5a8fc419379faa517e614c55b0b27de59572019d (patch) | |
| tree | 34cd7e61acfff90caee7dab264350b4bd77284bc /libc/startup | |
| parent | 0eb0fecbc544a0416b70f4450a38dfb27c9b5b9a (diff) | |
| download | llvm-5a8fc419379faa517e614c55b0b27de59572019d.zip llvm-5a8fc419379faa517e614c55b0b27de59572019d.tar.gz llvm-5a8fc419379faa517e614c55b0b27de59572019d.tar.bz2 | |
[libc] Disable atomic optimizations for `libc` AMDGPU builds
Recently the AMDGPU backend automatically enables a pass to optimize
atomics. This results in the LTO build taking about 10x longer in all
cases. For now we disable this by default as was the case before the
patch in D152649.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D153232
Diffstat (limited to 'libc/startup')
| -rw-r--r-- | libc/startup/gpu/amdgpu/CMakeLists.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libc/startup/gpu/amdgpu/CMakeLists.txt b/libc/startup/gpu/amdgpu/CMakeLists.txt index e7c0aea..b54dc37 100644 --- a/libc/startup/gpu/amdgpu/CMakeLists.txt +++ b/libc/startup/gpu/amdgpu/CMakeLists.txt @@ -26,4 +26,7 @@ target_link_libraries( "--target=${LIBC_GPU_TARGET_TRIPLE}" "-flto" "-Wl,-mllvm,-amdgpu-lower-global-ctor-dtor=0" + # FIXME: This pass causes builds to take ~10x longer. Disable until the + # performance problems have been addressed. + "-Wl,-mllvm,-amdgpu-atomic-optimizations=0" ) |