I have a single switch statement with about 30 case statements.
I could break the single switch into 3 or 4 switchs, which logically
would be more efficient.
switch()
{
switch() // only 10 cases
switch() // only 10 cases
}
But with compiler optimizations would it make any difference? Would
one way be better than the other?
I'm using MSVC 6 5 4282
On 18 Sep 2003 09:12:42 -0700, ro************* @gd-decisionsystems .com (Rob Adelberg) wrote: I have a single switch statement with about 30 case statements.
Perhaps you're stuck with someone else's code.
I could break the single switch into 3 or 4 switchs, which logically would be more efficient.
Nope, no logic in that.
switch() { switch() // only 10 cases
switch() // only 10 cases } But with compiler optimizations would it make any difference? Would one way be better than the other?
The C++ standard has nothing to say about that.
I'm using MSVC 6
Then ask in a Microsoft group (use news.microsoft. com if necessary),
it's off-topic here (see the FAQ).
Rob Adelberg wrote: I have a single switch statement with about 30 case statements.
I could break the single switch into 3 or 4 switchs, which logically would be more efficient.
Huh?
switch() { switch() // only 10 cases
switch() // only 10 cases } But with compiler optimizations would it make any difference? Would one way be better than the other?
I'm using MSVC
Switch is often a computed goto, especially if the cases are
reasonably contiguous. (Ooh, deja vu. I must be paraphrasing
someone, but I can't remember whom.) So with a single switch
you get a single computation and a single goto. In any case,
it's the compiler's job to choose the most efficient
implementation.
Regards,
Buster.
Buster Copley wrote: Rob Adelberg wrote:
I have a single switch statement with about 30 case statements.
I could break the single switch into 3 or 4 switchs, which logically would be more efficient.
Huh?
switch() { switch() // only 10 cases
switch() // only 10 cases } But with compiler optimizations would it make any difference? Would one way be better than the other?
I'm using MSVC
Switch is often a computed goto, especially if the cases are reasonably contiguous.
Switch _is_ a computed goto, obviously. Sorry. The person I was
paraphrasing was saying that it's often implemented using a jump
table.
Rob Adelberg wrote: I have a single switch statement with about 30 case statements.
I could break the single switch into 3 or 4 switchs, which logically would be more efficient.
switch() { switch() // only 10 cases
switch() // only 10 cases } But with compiler optimizations would it make any difference? Would one way be better than the other?
I'm using MSVC 6
Don't worry about efficiency. IMHO, the difference would be minimal. Go with what's
more readable and maintainable. Remember, either you or somebody else will probably
have to look at this a couple of years down the line, and if you make it easier to
deal with then, you've got a win.
"Rob Adelberg" <ro************ *@gd-decisionsystems .com> wrote in message news:f3******** *************** **@posting.goog le.com... I have a single switch statement with about 30 case statements.
I could break the single switch into 3 or 4 switchs, which logically would be more efficient.
That would probably not help. If the number of possible values versus
the number of cases is manageable, the compiler just generates a jump
table in most dcases. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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--
Duncan McNutt
Microsoft Product Deactivation Team
--
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