If you are debugging an Intel-based application and you step over a source line containing floating-point arithmetic, you may find that the values of floating-point registers in the Registers monitor are not displayed. Instead, "Not used" appears beside each register. In fact, one or more of these registers is being used during execution of the source line, but once you have stepped over the source line, the register's contents have been written to a variable and the register is no longer in use. If you want to step over a floating-point statement and see a floating-point register's value before it is written to the variable, do the following:
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Change the Contents of Registers
Change the Layout of the Registers Monitor
Change Which Registers Are Displayed