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It can be useful to know if the alpha plane consists of fully opaque pixels or not, in which case it can e.g. safely be stripped. This only requires a very minor modification to the AVX2 routines, adding an extra AND on the read alpha value with the reference alpha value, and a single extra cheap test per line. detect_alpha_8_full_c: 2849.1 ( 1.00x) detect_alpha_8_full_avx2: 260.3 (10.95x) detect_alpha_8_full_avx512icl: 130.2 (21.87x) detect_alpha_8_limited_c: 8349.2 ( 1.00x) detect_alpha_8_limited_avx2: 756.6 (11.04x) detect_alpha_8_limited_avx512icl: 364.2 (22.93x) detect_alpha_16_full_c: 1652.8 ( 1.00x) detect_alpha_16_full_avx2: 236.5 ( 6.99x) detect_alpha_16_full_avx512icl: 134.6 (12.28x) detect_alpha_16_limited_c: 5263.1 ( 1.00x) detect_alpha_16_limited_avx2: 797.4 ( 6.60x) detect_alpha_16_limited_avx512icl: 400.3 (13.15x)