64-bit
In this section:
The 64-bit options specify target-specific features for the IAR C/C++ Compiler and Assembler in 64-bit mode.

Data model
Selects the data model for your project:
- ILP32
This data model has 32-bit
longand pointer types, and 32-bitwchar_ttype. It uses 32-bit ELF as object and image format.
- LP64
This data model has 64-bit
longand pointer types, and 32-bitwchar_ttype. It uses 64-bit ELF as object and image format.
Note
Code generated using the ILP32 data model cannot be linked with code generated using the LP64 data model.
FPU
Select this option to use a floating-point unit with the data model, if it is available for your device.