ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

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Pseudocode details of Advanced SIMD vectors
Application Level Programmers’ Model
Figure A2-3 Examples of Advanced SIMD vectors
The pseudocode function Elem[] is used to access the element of a specified index and size in a vector:
// Elem[] - non-assignment form
// ============================
bits(size) Elem[bits(N) vector, integer e, integer size]
assert e >= 0 && (e+1)*size = 0 && (e+1)*size