32.22.4.4 Explanation of the F2R/F2RP Instructions
The F2R/F2RP instructions convert float variables to real
variables. Specify the float variable or constant in S1 that you
want to convert, and specify real variable for the conversion
output in D1. You can specify only a float variable for input in S1
and a real variable for output in S2. Use the convert instruction
when you want to use different variable types in a calculation or
comparison.
Refer to the following for specifying a constant.
When operand S1 is a float constant
Note that specified arrays (entire arrays) cannot be
converted.
When operands S1 and D1 specify the entire array, an error will
occur even if the specified variables are the same type.
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