32.22.6.4 Explanation of the R2F/R2FP Instructions

The R2F/R2FP instructions convert real variables to float variables. Specify the real variable or constant in S1 that you want to convert, and specify float variable for the conversion output in D1. You can specify only a real variable for input in S1 and a float variable for output in D1. 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 real 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.