IAR Embedded Workbench for Arm 9.70.xIAR C/C++ DevelopmentThe preprocessorDescription of predefined preprocessor symbols__ARM_PCS_AAPCS64__ARM_PCS_AAPCS64In this section: DescriptionThis symbol is defined to 1 if the default procedure calling standard for the translation unit conforms to the AAPCS64 standard.This symbol is defined according to ACLE (Arm C Language Extensions).