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| author | Carl-Anton Ingmarsson <mail@carlanton.se> | 2014-01-12 12:51:16 +0100 |
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| committer | Carl-Anton Ingmarsson <mail@carlanton.se> | 2014-01-12 20:25:57 +0100 |
| commit | e52f7c9239a0a523c04651f5eba3cad6f15fa217 (patch) | |
| tree | 11dac55bdaccd97c218d4fdbe734f24a83f9cb7a /src/rustllvm/RustWrapper.cpp | |
| parent | 1130886138f1dc6285ac2011c6bcabefd564bb7d (diff) | |
| download | rust-e52f7c9239a0a523c04651f5eba3cad6f15fa217.tar.gz rust-e52f7c9239a0a523c04651f5eba3cad6f15fa217.zip | |
ebml::extra: Optimize reader::vuint_at()
Use a lookup table, SHIFT_MASK_TABLE, that for every possible four bit prefix holds the number of times the value should be right shifted and what the right shifted value should be masked with. This way we can get rid of the branches which in my testing gives approximately a 2x speedup.
Diffstat (limited to 'src/rustllvm/RustWrapper.cpp')
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