Re: Binary search in fmgr_isbuiltin() is a bottleneck.

On 2017-09-27 15:50:05 -0400, Tom Lane wrote:
> ISTM it shouldn't be that hard to get Gen_fmgrtab.pl to emit an index
> array of the sort we're talking about, along with the FmgrBuiltin array
> it already prints out.  I'm the world's worst Perl programmer but
> I'm happy to take a stab at it if you don't want to.

I might be worse than you... But anyway, here's a patch doing
so. Looking at profiles, it turned out that having the integer limits as
extern variables in a different TU isn't a great idea. So I moved what
used to be fmgrtab.c to fmgrtab.h, and included it directly in fmgr.c.

Is this roughly what you were thinking of?

Greetings,

Andres Freund