IAR Embedded Workbench for RX 5.20IAR C/C++ DevelopmentThe preprocessorDescription of predefined preprocessor symbols__DBL4__DBL4In this section: DescriptionAn integer that reflects the setting of the option --double. It is defined when 32-bit doubles are used, otherwise it is undefined. When defined, its value is 1.This symbol is available for compatibility with Renesas CC-RX.