9.30.2.2 Register Names

General purpose registers (GPR)

There are 32 32-bit general purpose registers $r0 to $r31.

Accumulators d0 and d1

64-bit accumulators: $d0.hi, $d0.lo, $d1.hi, and $d1.lo.

Assembler reserved register $ta

Register $ta ($r15) is reserved for assembler using.

Operating system reserved registers $p0 and $p1

Registers $p0 ($r26) and $p1 ($r27) are used by operating system as scratch registers.

Frame pointer $fp

Register $r28 is regarded as the frame pointer.

Global pointer

Register $r29 is regarded as the global pointer.

Link pointer

Register $r30 is regarded as the link pointer.

Stack pointer

Register $r31 is regarded as the stack pointer.