Re: Allowing the choice of a VM engine?

[Andy Wingo <wingo@pobox.com>]

Hi :)

On Wed 01 Sep 2010 09:04, ludo@gnu.org (Ludovic Courtès) writes:

> PS: I’m reviving the thread because I’m consistently seeing a 10%
>     performance degradation in the SRFI-1 rewrite in Scheme, which I’m
>     not comfortable with (not that “higher-level languages are
>     inefficient” song again!).

So, my thought is that 10% slower is actually pretty good. Of course
without debug hooks things are going to be faster still, but would you
care at all about this if the Scheme version happened to be as fast as
the C version?

But OK. I don't want it to be default, though. How do you feel about
--no-debug, as we have already? We should default to the equivalent of
--debug.

Cheers,

Andy

Ps. I was going to say we should improve compilation instead, but the
hot loop of fold is already pretty tight.

  19    (local-ref 5)                   ;; `list1'
  21    (br-if-not-null :L104)          ;; -> 28              at srfi/srfi-1.scm:408:8
  25    (local-ref 4)                   ;; `knil'
  27    (return)                        
  28    (new-frame)                                           at srfi/srfi-1.scm:410:15
  29    (local-ref 0)                   ;; `kons'
  31    (local-ref 5)                   ;; `list1'
  33    (car)                                                 at srfi/srfi-1.scm:410:21
  34    (local-ref 4)                   ;; `knil'
  36    (call 2)                                              at srfi/srfi-1.scm:410:15
  38    (local-ref 5)                   ;; `list1'
  40    (cdr)                                                 at srfi/srfi-1.scm:410:39
  41    (local-set 5)                   ;; `list1'
  43    (local-set 4)                   ;; `knil'
  45    (br :L105)                      ;; -> 19              at srfi/srfi-1.scm:410:12
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