ignore(_none/_extrema)
Synopsis
Declared in <folly/algorithm/simd/Ignore.h>
struct ignore_extrema;Description
tag types to be used in some simd operations.
They are used to indicate to the function that some of the elements in are garbage.
ignore_none indicates that the whole register is used. ignore_extrema.first, .last show how many elements are out of the data.
Example: register: [true, true, false, false, false, false, false, true] indexes [0, 1, 2, 3, 4, 5, 6, 7 ]
ignore_extrema{.first = 1, .last = 2} means that elements with indexes 0, 6, and 7 will be ignored (w/e that means for an operation)