Re: Memory prefetching while sequentially fetching from SortTuple array, tuplestore

On Wed, Sep 2, 2015 at 12:24 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> On Wed, Sep 2, 2015 at 7:12 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>> On 2015-07-19 16:34:52 -0700, Peter Geoghegan wrote:
>> Hm. Is a compiler test actually test anything reliably here? Won't this
>> just throw a warning during compile time about an unknown function?
>
> I'll need to look into that.

My error here was not considering why the existing __builtin_bswap32()
test worked alright with AC_COMPILE_IFELSE(), while my test needed
AC_LINK_IFELSE(). I'll be sure to make a point of manually testing
failure (not just success) when writing compiler tests in the future.

AC_LINK_IFELSE() appears to work fine following a straight
substitution. When I get around to revising this patch in a while,
that fix will be included.

Thanks
--
Peter Geoghegan