mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-19 06:31:18 +00:00
b6516aeef1
http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel In a silly microbenchmark on a 65 nm core2 this is 1.5x faster than the old code in 32 bit mode and about 2x faster in 64 bit mode. It's also a lot shorter, especially when counting 64 bit population on a 32 bit target. I hope this is fast enough to replace Kernighan-style counting loops even when the input is rather sparse. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123547 91177308-0d34-0410-b5e6-96231b3b80d8
\Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the HTML documentation provided in docs/index.html for further assistance with LLVM. If you're writing a package for LLVM, see docs/Packaging.html for our suggestions.