Compile options
Nathan Moinvaziri edited this page Mar 10, 2021
·
1 revision
The compiler options for configure and CMake can be found in the README.md.
-
UNALIGNED_OK- This enables optimizations for CPUs where unaligned access of memory is OK. This is safe for most modern systems, and gives a slight improvement in performance. -
UNALIGNED64_OK- This enables optimizations for CPUS where 64-bit unaligned memory access is OK. This is safe for most modern systems, and gives a slight improvement in performance. -
UNROLL_MORE- This makes crc32 and adler32 unroll more of the code. This is slower on most modern systems due to the code becoming bigger. -
X86_NOCHECK_SSE2- Assume SSE2 instructions are allowed. This optimizes away the runtime cpuid check for SSE2 availability. This is always safe on x86_64 since SSE2 is mandatory.