On Mon, Jul 11, 2022 at 11:07 PM Andres Freund <and...@anarazel.de> wrote:
> I wonder if we can add a somewhat more general function for scanning until
> some characters are found using SIMD? There's plenty other places that
could
> be useful.
In simple cases, we could possibly abstract the entire loop. With this
particular case, I imagine the most approachable way to write the loop
would be a bit more low-level:
while (p < end - VECTOR_WIDTH &&
!vector_has_byte(p, '\\') &&
!vector_has_byte(p, '"') &&
vector_min_byte(p, 0x20))
p += VECTOR_WIDTH
I wonder if we'd lose a bit of efficiency here by not accumulating set bits
from the three conditions, but it's worth trying.
--
John Naylor
EDB: http://www.enterprisedb.com
