# Copyright 1999-2019 Gentoo Authors # Distributed under the terms of the GNU General Public License v2 # Whenever the flag name does not correspond to /proc/cpuinfo flags, # please put the cpuinfo flag in square brackets. If more than one flag # is specified, any of them will enable the respective USE flag. 3dnow - Use the 3DNow! instruction set 3dnowext - Use the Enhanced 3DNow! instruction set aes - Enable support for Intel's AES instruction set (AES-NI) avx - Adds support for Advanced Vector Extensions instructions avx2 - Adds support for Advanced Vector Extensions 2 instructions avx512dq - Use AVX-512 double- and quad-word instructions avx512f - Adds support for AVX-512 Foundation instructions avx512vl - Use AVX-512 vector-length instructions f16c - Adds support for F16C instruction set for converting between half-precision and single-precision floats fma3 - Use the Fused Multiply Add 3 instruction set ([fma] in cpuinfo) fma4 - Use the Fused Multiply Add 4 instruction set mmx - Use the MMX instruction set mmxext - Use the Extended MMX instruction set (a subset of SSE) ([mmxext] or [sse] in cpuinfo) padlock - Use VIA padlock instructions ([phe] in cpuinfo) pclmul - Use Carry-less Multiplication instructions ([pclmulqdq] in cpuinfo) popcnt - Enable popcnt instruction support ([abm] or [popcnt] in cpuinfo) rdrand - Use the RDRAND instruction for generating random numbers sha - Use the SHA-NI instruction set sse - Use the SSE instruction set sse2 - Use the SSE2 instruction set sse3 - Use the SSE3 instruction set ([pni] in cpuinfo, NOT ssse3) sse4_1 - Enable SSE4.1 instruction support sse4_2 - Enable SSE4.2 instruction support sse4a - Enable SSE4a instruction support ssse3 - Use the SSSE3 instruction set (NOT sse3/pni) xop - Enable the XOP instruction set