08 - Vectorized Query Execution with SIMD (CMU Advanced Databases / Spring 2023)

15-721 Advanced Database Systems (Spring 2023)
Carnegie Mellon University

[周章华-bm]

at 35:40, [a, b, 0, 0] = expand(0101, [a, b, c, d])
but in paper, [0, a, 0, b] = expand(0101, [a, b, c, d])
It seems that the paper is more in line with the "expand" semantics

[neshkeev]

39:45 why do you call a ternary operator "branchless"? `m = key >= low ? 1 : 0` naturally translates into `m = if key >= low then 1 else 0`, which is obviously "branchful"