Behaviour of X86Cpu.isUarch - 5.2 English - 68552

X86Cpu.isUarch supports two arguments.

• EUarch - Micro Architecture {Zen, Zen2, Zen3, Zen4, Zen5}

• strict - Bool {True/False}

With strict argument set to “False” which is the default behaviour.

AOCL 5.2	isUarch(Zen)	isUarch(Zen2)	isUarch(Zen3)	isUarch(Zen4)	isUarch(Zen5)
Skylake	False	False	False	False	False
Bulldozer	False	False	False	False	False
Zen1/1+	True	False	False	False	False
Zen2	True	True	False	False	False
Zen3	True	True	True	False	False
Zen4	True	True	True	True	False
Zen5	True	True	True	True	True
Zen[X>5]	True	True	True	True	True

With strict argument set to “True”.

AOCL 5.2	isUarch(Zen,1)	isUarch(Zen2,1)	isUarch(Zen3,1)	isUarch(Zen4,1)	isUarch(Zen5,1)
Skylake	False	False	False	False	False
Bulldozer	False	False	False	False	False
Zen1/1+	True	False	False	False	False
Zen2	False	True	False	False	False
Zen3	False	False	True	False	False
Zen4	False	False	False	True	False
Zen5	False	False	False	False	True
Zen[X>5]	False	False	False	False	True

There is one additional API isZenFamily which detects if the CPU is based on Zen architecture.

AOCL 5.2	isZenFamily
Skylake	False
Bulldozer	False
Zen1/1+	True
Zen2	True
Zen3	True
Zen4	True
Zen5	True
Zen[X>5]	True