IAR Embedded Workbench for Arm 9.70.xIAR C/C++ DevelopmentThe preprocessorDescription of predefined preprocessor symbols__ARMVFP_D16____ARMVFP_D16__In this section: DescriptionAn integer that is set based on the compiler option ‑‑fpu. The symbol is set to 1 if the selected FPU is a VFPv3 or VFPv4 unit with only 16 D registers. Otherwise, the symbol is undefined.See also‑‑fpu.