# prefetch = yes/no --- -DUSE_PREFETCH --- Use prefetch x86 asm-instruction
# bsfq = yes/no --- -DUSE_BSFQ --- Use bsfq x86_64 asm-instruction (only
# with GCC and ICC 64-bit)
# popcnt = yes/no --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction
# prefetch = yes/no --- -DUSE_PREFETCH --- Use prefetch x86 asm-instruction
# bsfq = yes/no --- -DUSE_BSFQ --- Use bsfq x86_64 asm-instruction (only
# with GCC and ICC 64-bit)
# popcnt = yes/no --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction