HEIR: Homomorphic Encryption Intermediate Representation

HEIR is an open-source MLIR-based compiler toolchain for fully homomorphic encryption (FHE). It compiles high-level programs and pre-trained AI models to run inference on encrypted inputs.

Supported backends include OpenFHE, Lattigo, tfhe-rs, and Jaxite. Hardware accelerator codegen targets GPU, TPU, FPGA, and custom ASICs. Maintained by Google as part of its Private Computing Toolkit.