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#### 9.33.1.2 Register Names

The OpenRISC register file contains 32 general pupose registers.

- The 32 general purpose registers are referred to as ‘`rn`’.
- The stack pointer register ‘`r1`’ can be referenced using the alias ‘`sp`’.
- The frame pointer register ‘`r2`’ can be referenced using the alias ‘`fp`’.
- The link register ‘`r9`’ can be referenced using the alias ‘`lr`’.

Floating point operations use the same general purpose registers. The instructions `lf.itof.s` (single precision) and `lf.itof.d` (double precision) can be used to convert integer values to floating point. Likewise, instructions `lf.ftoi.s` (single precision) and `lf.ftoi.d` (double precision) can be used to convert floating point to integer.

OpenRISC also contains privileged special purpose registers (SPRs). The SPRs are accessed using the `l.mfspr` and `l.mtspr` instructions.