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authorAlexander Smarus <bender@readdle.com>2023-10-20 20:17:12 +0300
committerGitHub <noreply@github.com>2023-10-20 22:47:12 +0530
commitc6f0f8810db5ce4de4bd326950b644e846a1497e (patch)
tree838c453172f57c3a3602c677797d8c64716efc16 /lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPlatformPythonInterface.cpp
parent2483763f1aeba5fabff88360b9f44a2ba0bca9d9 (diff)
Workaround for MSVC ARM64 build performance regression (#65215)
MSVC has a major performance regression observed when targeting ARM64 since v19.32 (VS 17.2.0). `cl.exe` spends a lot of time on compiling `StandardLibrary.cpp` and `CGBuiltin.cpp`, and total build duration rises extremely. This makes builds stagnate even on a real hardware, but VM-based builds (like building on cloud agents from GitHub Actions and Azure Pipelines) are experiencing most damage as they also performance- and time-limited. The issue appears to be related to some optimizations applied in `/O2` mode. It is reported on [Developer Community](https://developercommunity.visualstudio.com/t/Compiling-a-specific-code-for-ARM64-with/10444970). While the investigation is in progress, we could apply a workaround to improve build time. `/O2` actually enables a set of optimizations, and only one of them does all slowdown. The idea is to disable optimizations, and then apply all but one back, effectively excluding the problematic option from the set. This patch alters the CMake configuration for aforementioned files. Changes are limited to: - non-debug builds - MSVC of the specific version - target arch (ARM64).
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPlatformPythonInterface.cpp')
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