Indexed address problem

Hello, We are trying to write a new backend for GCC. The target machine is 16-bit, with 24-bit pointers. However, the indexed addressing mode has a 24-bit base and a 16-bit index, so we want to generate RTXs such as (mem:QI (plus:SI (reg:HI ) (reg:SI ))) (mem:HI (plus:SI (mul

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Hello, We are trying to write a new backend for GCC. The target machine is 16-bit, with 24-bit pointers. However, the indexed addressing mode has a 24-bit base and a 16-bit index, so we want to generate RTXs such as (mem:QI (plus:SI (reg:HI ) (reg:SI ))) (mem:HI (plus:SI (mul