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* Add regression test for double shufti It tests for false positive at vector edges. Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> * Fix double shufti reporting false positives Double shufti used to offset one vector, resulting in losing one character at the end of every vector. This was replaced by a magic value indicating a match. This meant that if the first char of a pattern fell on the last char of a vector, double shufti would assume the second character is present and report a match. This patch fixes it by keeping the previous vector and feeding its data to the new one when we shift it, preventing any loss of data. Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> * vshl() will call the correct implementation * implement missing vshr_512_imm(), simplifies caller x86 code * Fix x86 case, use alignr instead * it's the reverse, the avx512 alignr is incorrect, need to fix * Make shufti's OR reduce size agnostic Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> * Fix test's array size Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> * Fix AVX2/AVX512 alignr implementations and unit tests * Fix Power VSX alignr --------- Signed-off-by: Yoan Picchi <yoan.picchi@arm.com> Co-authored-by: Konstantinos Margaritis <konstantinos@vectorcamp.gr>