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https://www.phoronix.com/scan.php?page=news_item&px=Firefox-Clang-LTO-All-Platforms |
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|
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"Firefox nightly builds are now built with the LLVM Clang compiler on all |
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major platforms and the Linux build in particular is also now utilizing PGO |
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optimizations too. Faster Firefox is coming thanks to this compiler work. |
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|
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All of Mozilla's tier-one platforms are now building the newest Firefox |
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browser code under the Clang compiler and having LTO (Link Time |
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Optimizations <https://www.phoronix.com/vr.php?view=17785>) enabled. That |
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includes Linux, Mac, Android, Windows across ARM / AArch64 / x86 relying |
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upon this open-source compiler. For now only the Linux builds also have PGO |
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(Profile Guided Optimizations <https://www.phoronix.com/vr.php?view=26589>) |
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enabled. |
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|
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With the compiler re-tooling on Linux they are seeing about 5% better |
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performance and upwards of 18% in select tests compared to their previous |
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GCC (6.4-based) compiler with PGO. The current Clang stack they are using |
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is based on LLVM6 while when they transition to the upcoming LLVM/Clang 7.0 |
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they expect 2~5% better performance on top of that. |
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|
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Mozilla developers did try GCC LTO as well as switching to the newest GCC8 |
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release, but ran into problems. These new release binaries should go into |
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effect for the Firefox 64 release." |
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