ermsb

REP MOVS/STOS are fast.

CPUs:

• broadwell
• cannonlake
• cascadelake
• cooperlake
• core-avx2
• haswell
• icelake-client
• icelake-server
• rocketlake
• sapphirerapids
• skx
• skylake
• skylake-avx512
• tigerlake