Commit e4ec23d7ae051c1c73947f889818900362fdc52d
2021-02-10T16:45:50
Neon: Use byte-swap builtins instead of inline asm Define compiler-independent byte-swap macros and use them instead of executing 'rev' via inline assembly code with GCC-compatible compilers or a slow shift-store sequence with Visual C++. * This produces identical assembly code with: - 64-bit GCC 8.4.0 (Linux) - 64-bit GCC 9.3.0 (Linux) - 64-bit Clang 10.0.0 (Linux) - 64-bit Clang 10.0.0 (MinGW) - 64-bit Clang 12.0.0 (Xcode 12.2, macOS) - 64-bit Clang 12.0.0 (Xcode 12.2, iOS) * This produces different assembly code with: - 64-bit GCC 4.9.1 (Linux) - 32-bit GCC 4.8.2 (Linux) - 32-bit GCC 8.4.0 (Linux) - 32-bit GCC 9.3.0 (Linux) Since the intrinsics implementation of Huffman encoding is not used by default with these compilers, this is not a concern. - 32-bit Clang 10.0.0 (Linux) Verified performance neutrality Closes #507