[pypy-dev] The correct way to incrementally build list in RPython
Armin Rigo
arigo at tunes.org
Fri Jun 27 12:37:32 CEST 2014
Hi Yichao,
On 27 June 2014 12:17, Yichao Yu <yyc1992 at gmail.com> wrote:
> I am still creating a tuple out of these 5 numbers/strings since I
> don't want to duplicate the hash functions for all of them. Can the
> compiler deal with this case efficiently?
If by "deal with this case efficiently" you mean, will the compiler
remove the tuple allocation and inline the 5-elements hash, then it
might just be possible depending on a number of details, but I doubt
it. Better to be explicit. I had in mind something like:
my_hash = num1 * 1000003
my_hash = (my_hash ^ num2) * 1000003
my_hash = (my_hash ^ compute_hash(string3))
my_hash = intmask(my_hash) # at the end
A bientôt,
Armin.
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