Encoding:

Format:

DMTC0 rt, rs

DMTC0 rt, rs, sel

Purpose:

Doubleword Move to Coprocessor 0

To move a doubleword from a GPR to a coprocessor 0 register.

Description:

 CPR[0,rs,sel] = GPR[rt]

The contents of GPR rt are loaded into the coprocessor 0 register specified in the rd and sel fields. Not all coprocessor

0 registers support the sel field. In those instances, the sel field must be zero.

Restrictions:

The results are UNDEFINED if coprocessor 0 does not contain a register as specified by rs and sel, or if the coprocessor 0 register specified by rd and sel is a 32-bit register.

Operation:

// 'Width' returns width (32/64) of data returned by CPR.
if ((Width(CPR[0,rs,sel])  = 32) and (ConfigAR>=2) ) then 
   dataword <- GPR[rt]31:0
   CPR[0,rs,sel] <- dataword
elseif ((Width(CPR[0,rs,sel])  = 32) and (ConfigAR<2)) then 
   UNDEFINED
else
   datadoubleword <- GPR[rt]
   CPR[0,rs,sel] <- datadoubleword
endif

Exceptions:

Coprocessor Unusable, Reserved Instruction