Encoding:

Format:

MFLHXU rd

Purpose:

Move from Extended Carry, Hi and Lo (Unsigned)

Extract extended Hi/Lo state.

Description:

 GPR[rd] = LO; LO = HI; HI = ACX; ACX = 0;

The value in special register LO is written to GPR rd. The value in special register HI is then written to special register

LO, the extended accumulator bits ACX are zero-extended and copied to HI, and the extended accumulator bits ACX

are cleared

• The number of ACX extended accumulator bits is implementation dependent, ranging from 8 to 64 bits.

• If 64-bit operations are not available and enabled, at most the least-signiicant 32 bits of ACX will be copied to

HI, but the whole ACX ield will then be cleared.

Restrictions:

None

Operation:

newHI = zero_extend(ACX)
newLO = HI
GPR[rd] = LO
LO = newLO
HI = newHI
ACX = 0

Exceptions:

None