Support for the SDIV/UDIV instructions is mandatory in ARMv7-M and for the Thumb instruction set in ARMv7-R. It is optional for the ARM instruction set in ARMv7-R. It is optional in ARMv7-A and, if supported, may be in the Thumb instruction set only or in both Thumb and ARM. In ARMv7-A with the Virtualization Extensions, it is mandatory in Thumb and ARM.