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All normal rtl expressions can be used with vector modes; they are interpreted as operating on each part of the vector independently. Additionally, there are a few new expressions to describe specific vector operations.
(vec_merge:m vec1 vec2 items)
const_int; a zero bit indicates the corresponding element in the result vector is taken from vec2 while a set bit indicates it is taken from vec1.
(vec_select:m vec1 selection)
parallelthat contains a
const_intfor each of the subparts of the result vector, giving the number of the source subpart that should be stored into it.
(vec_concat:m vec1 vec2)
parallelthat contains a constant for each of the subparts of the vector.