App - 43
(4) Replacing the High Performance model QCPU with the Universal model QCPU
(a) Replacing all single-precision floating-point operation instructions with double-precision
floating-point operation instructions
Single-precision floating-point data occupy two points of word device per data.
On the other hand, four points are required per double-precision floating-point data.
Therefore, all device numbers for storing floating-point data need to be reassigned.
1) Device assignment
2) Program before replacement
3) Program after replacement
Example
Replacing the floating-point operation [A B+C] (Changing all floating-point
data into double precision.)
TableApp.36 Device assignment
Before replacement After replacement
Application Device Data type Application Device Data type
Data A D0 to D1
Floating-point data
(single precision)
Data A D0 to D3
Floating-point data
(double precision)
Data B D2 to D3 Data B D4 to D7
Data C D4 to D5 Data C D8 to D11
Result D6 to D7 Result D12 to D15
Figure App.20 Sample program
Figure App.21 Sample program
Operation is performed using
double-precision floating-point
data.
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