Designing SOCs with Configured Cores

3.7. Base Xtensa Instructions

The base Xtensa ISA consists of more than 70 instructions in ten groups, listed in Table 3.1. Tables 3.2–3.9 give expanded explanations for the base instruction groups. These base instructions are sufficient to cover the needs of any program written in assembly language, C, or C++. For more performance, TIE instruction extensions can introduce nearly any instruction imaginable, as discussed in Chapter 4. Detailed explanations of the base Xtensa instructions appear in the Xtensa and Diamond Standard processor core data books.

Table 3.1. Base Xtensa ISA instruction summary

Instruction group	Instructions
Load	L8UI, L16SI, L16UI, L32I, L32R
Store	S8I, S16I, S32I
Memory Ordering	MEMW, EXTW
Jump, Call	CALL0, CALLX0, RETJ, JX
Conditional ...