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Re: Lambda efficiency
From: |
Andy Wingo |
Subject: |
Re: Lambda efficiency |
Date: |
Tue, 22 Jun 2010 21:30:47 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux) |
Heya,
On Tue 22 Jun 2010 21:18, Michael Lucy <address@hidden> writes:
> I'm generating some code, and I was wondering if:
> ((lambda (x) (* x 2)) 3)
> is significantly less efficient than:
> (* 3 2)
((lambda (x) y) z) is reduced to (let ((x z)) y) at compile-time. We
don't inline x yet, though we will soon.
Verily:
scheme@(guile-user)> ,c ((lambda (x) (* x 2)) 3)
Disassembly of #<objcode 8b98968>:
0 (assert-nargs-ee/locals 8)
2 (make-int8 3) ;; 3
4 (local-set 0)
6 (local-ref 0)
8 (make-int8 2) ;; 2
10 (mul)
11 (return)
scheme@(guile-user)> ,c (* 2 3)
Disassembly of #<objcode 8eac318>:
0 (assert-nargs-ee/locals 0)
2 (make-int8 2) ;; 2
4 (make-int8 3) ;; 3
6 (mul)
7 (return)
Andy
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