IAR Embedded Workbench for Arm 9.70.xIAR C/C++ DevelopmentThe preprocessorDescription of predefined preprocessor symbols__ARM_ARCH_ISA_THUMB__ARM_ARCH_ISA_THUMBIn this section: DescriptionThis symbol is defined according to ACLE (Arm C Language Extensions).See alsoArm C Language Extensions (IHI 0053D)