On Thu, Jul 14, 2022 at 3:59 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Even in an assert-enabled build, wouldn't you expect the compiler to
> optimize away the second assertion as unreachable code?
I think that it probably would, even at -O0 (GCC doesn't really allow
you to opt out of all optimizations). I did think of that myself, but
it seemed rather beside the point.
There have been individual cases where individual assertions were
deemed a bit too heavyweight. But those have been few and far between.
I myself tend to use *lots* of technically-redundant assertions like
this for preconditions and postconditions. At worst they're code
comments that are all but guaranteed to stay current.
--
Peter Geoghegan