From: Brian Hurt <bhurt@spnz.org>
To: Ocaml Mailing List <caml-list@inria.fr>
Subject: [Caml-list] Stupid question
Date: Wed, 14 Jan 2004 18:03:56 -0600 (CST) [thread overview]
Message-ID: <Pine.LNX.4.44.0401141350450.4373-100000@localhost.localdomain> (raw)
I was poking around in the produced assembly code of some ocaml code of
mine, and I noticed something. The construct:
if (x < m) <> (y < m) then
...
when the compiler knows that x, y, and m are all ints, it calls an
external C routine to compare the two booleans. But the construct:
if (x < m) != (y < m) then
...
does not. Now, this isn't a big deal- I just replaced <> with != and no
problem. But I was kind of interested in why the compiler didn't catch
and optimize this. Is there some sort of subtle semantic difference I'm
too dense to see?
--
"Usenet is like a herd of performing elephants with diarrhea -- massive,
difficult to redirect, awe-inspiring, entertaining, and a source of
mind-boggling amounts of excrement when you least expect it."
- Gene Spafford
Brian
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next reply other threads:[~2004-01-14 23:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-15 0:03 Brian Hurt [this message]
2004-01-15 3:57 ` skaller
2004-01-15 6:13 ` Brian Hurt
2004-01-15 8:37 ` Christophe Raffalli
2004-01-16 0:43 ` Jacques Garrigue
2004-01-16 2:35 ` Brian Hurt
2004-01-16 8:40 ` Hendrik Tews
2004-01-16 10:25 ` Frederic van der Plancke
2004-01-16 12:07 ` Alex Baretta
2004-01-16 5:41 ` Nicolas Cannasse
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