On 07-Feb-2017 8:11 PM, "Stefan Monnier" <monnier@iro.umontreal.ca> wrote:

>> Hmm... so goto-if-nil is never used any more?  Aren't there cases where
>> byte-switch results in slower code than goto-if-nil?
> Once linear search for gethash when the number of keys are small is
> implemented, byte-switch should still be faster, as all byte-goto-if-nil
> and byte-goto-if-nil-else-pop bytecode is "replaced" with native linear
> search code.

Does that mean you answered "yes" to the first question?
I thought goto-if-nil is also used in other circumstances.


No. goto-if-nil is still used to compile `if` and other conditional forms.
It's also used for cond forms which cannot use byte-switch, like:
(cond ((eq v 1) 'foo)
            ((stringp v) 'bar))
Or forms where some not all clauses use the same test function, since the
hash table can only use a single test.