DesignerRenesas Electronics
EncodingFixed, 16- or 32-bit
16× 32-bit integer registers

The M32R is a 32-bit RISC instruction set architecture (ISA) developed by Mitsubishi Electric for embedded microprocessors and microcontrollers. The ISA is now owned by Renesas Electronics Corporation, and the company designs and fabricates M32R implementations. M32R processors are used in embedded systems such as Engine Control Units, digital cameras and PDAs. The ISA was supported by Linux and the GNU Compiler Collection but was dropped in Linux kernel version 4.16.[1][2] GCC removed support for this architecture in the GCC 12.1 release.[3]


  1. ^ Simon Sharwood (3 April 2018). "Linux 4.16 arrives, erases eight CPUs and keeps melting Meltdown". theregister.co.uk. Situation Publishing. Archived from the original on 3 April 2018. Retrieved 3 April 2018.
  2. ^ "[GIT PULL] arch: remove obsolete architecture ports". Retrieved 2024-02-20.
  3. ^ GCC (15 Jun 2023). "GCC 12 Release Series: Changes, New Features, and Fixes". gcc.gnu.org. Situation Publishing. Archived from the original on 15 Jun 2023. Retrieved 15 Jun 2023.