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For many game studios, fast builds are essential to their development process and a lot of time and effort can be spent keeping builds fast. To support this, the PS4 toolchain will shortly support a new Clang feature; time traces. This tells you where the compiler is spending its time, giving you an insight into what the compiler is doing and an insight into your own code.
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The title of this lighting talk is from a bug filed in the early days of the PS4 compiler. It noted that the LLVM-based PS4 compiler was more than 3 times larger than the PS3 compiler. Since then it has almost doubled to over 40MB. For a compiler which targets one system this seems excessive. Executable size can cost in worse cache performance and cost time if transferring for distributed builds.
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Game developers make a number of assumptions about how the compiler works. SN Systems has implemented “Check CFC” (Compile Flow Consistency) to help ensure their assumptions hold true for the PlayStation®4 (PS4) compiler. This has been contributed to the open source LLVM compiler community. Using…
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