On Wed, Sep 23, 2026 at 10:10:09AM -0400, Sehrope Sarkuni wrote:
> lpad() and rpad() pad one character at a time, calling
> pg_mblen_range() and memcpy() once per padding char. When the padding
> string is a single byte, e.g., lpad(x, n, '0') or rpad(x, n, ' '),
> the padding is that byte repeated, so the attached patch fills it with
> one memset().
I wonder if we could expand these gains by using SIMD whenever the vector
length is divisible by the padding string length. My hunch is that's where
a lot of the memset() gains come from.
--
nathan
