优化代码 [英] optimized code
问题描述
托管C ++编译器是否仍会产生比C＃编译器好得多的优化，或者已经推出了一些更多的b / b
全局/主动优化进入2005编译器？
简单的常见子表达式和循环不变量是否在
当前优化器中优化了？
谢谢，
m
Is it still true that the managed C++ compiler will produce much better
opimizations than the C# compiler, or have some of the more
global/aggressive opimizations been rolled into the 2005 compiler?
Are simple common sub-expressions and loop invariants optimized out in the
current optimizer?
thanks,
m
推荐答案
" Mike" < 6 ******** @ yahoo.com>在消息中写道
新闻：Oj **************** @ TK2MSFTNGP10.phx.gbl ...
"Mike" <vi********@yahoo.com> wrote in message
news:Oj****************@TK2MSFTNGP10.phx.gbl...
它还在吗？确实，托管C ++编译器将产生比C＃编译器更好的选择，或者是否已经将一些更多的全局/主动优化设置引入2005编译器？
Is it still true that the managed C++ compiler will produce much better
opimizations than the C# compiler, or have some of the more
global/aggressive opimizations been rolled into the 2005 compiler?
是的，托管C ++编译器应该仍然更好。无论如何，C＃编译器仍然无法进行优化，AFAIK也不会走得太远。它们被留给了JIT。
Yes, the Managed C++ compiler should still be better. the C# compiler still
doesn''t go very far as far as optimizations go, AFAIK anyway. They are left
to the JIT.
Daniel O''Connell [C＃MVP]" ; < onyxkirx @ - NOSPAM--comcast.net>写在
消息新闻：eN **************** @ TK2MSFTNGP09.phx.gbl ...
"Daniel O''Connell [C# MVP]" <onyxkirx@--NOSPAM--comcast.net> wrote in
message news:eN****************@TK2MSFTNGP09.phx.gbl...
是的，托管C ++编译器应该仍然更好。 C＃编译器
在优化过程中仍然没有走得太远，AFAIK无论如何。他们将被留给JIT。
Yes, the Managed C++ compiler should still be better. the C# compiler
still doesn''t go very far as far as optimizations go, AFAIK anyway. They
are left to the JIT.
谢谢。好吧，我想我不在乎编译器是否具有魔力，或者
JIT。
我假设JIT仅限于窥视孔优化？ JIT是否处理
常见的子表达式删除，循环不变等等？
如果我有一个类似的内循环：
for（i ...）{
abcx = ...
abcy = ...
abcarr [i] =
...
}
我是否需要将abc放在循环外的本地，或者是JIT拿这个？b $ b关心这个？
有时用这种方式代码更干净，有时候不行 - 但是还有
auto生成的代码，以及我是否需要生成带有临时值的代码。
谢谢
Thanks. Well, I guess I don''t care if the compiler does the magic, or the
JIT.
I assume the JIT is limited to peephole optimizations? Does the JIT handle
common sub-expression removal, loop invarients, etc?
If I have an inner loop of something like:
for ( i ...) {
a.b.c.x = ...
a.b.c.y = ...
a.b.c.arr[i] =
...
}
Do I need to put a.b.c in a local outside the loop, or will the JIT take
care of this?
Sometimes it''s cleaner to code this way, sometimes not - but there''s also
auto-generated code, and whether I need to generate code with temps.
thanks
有趣，重新：托管C ++：
http：// msdn。 microsoft.com/msdnmag/is...Optimizations/
" Mike" < 6 ******** @ yahoo.com>在消息中写道
news：ui **************** @ TK2MSFTNGP10.phx.gbl ...
Interesting, re: managed C++:
http://msdn.microsoft.com/msdnmag/is...Optimizations/
"Mike" <vi********@yahoo.com> wrote in message
news:ui****************@TK2MSFTNGP10.phx.gbl...
Daniel O''Connell [C＃MVP]" < onyxkirx @ - NOSPAM--comcast.net>在消息新闻中写道：eN **************** @ TK2MSFTNGP09.phx.gbl ...
"Daniel O''Connell [C# MVP]" <onyxkirx@--NOSPAM--comcast.net> wrote in
message news:eN****************@TK2MSFTNGP09.phx.gbl...
是的，托管C ++编译器应该仍然更好。 C＃编译器
在优化过程中仍然没有走得太远，AFAIK无论如何。他们将被留给JIT。
Yes, the Managed C++ compiler should still be better. the C# compiler
still doesn''t go very far as far as optimizations go, AFAIK anyway. They
are left to the JIT.
谢谢。好吧，我想我不在乎编译器是否具有魔力或者JIT。
我认为JIT只限于窥视孔优化？ JIT是否处理常见的子表达式删除，循环不变等等？
如果我有一个内部循环，例如：
for（i ...）{
abcx = ...
abcy = ...
abcarr [i] =
...
}
我需要吗？将abc放在循环外的本地，或JIT是否会对此进行处理？
有时以这种方式编码更清晰，有时候不是 - 但也有
自动生成的代码，以及是否需要生成带有临时值的代码。
感谢
Thanks. Well, I guess I don''t care if the compiler does the magic, or the
JIT.
I assume the JIT is limited to peephole optimizations? Does the JIT
handle common sub-expression removal, loop invarients, etc?
If I have an inner loop of something like:
for ( i ...) {
a.b.c.x = ...
a.b.c.y = ...
a.b.c.arr[i] =
...
}
Do I need to put a.b.c in a local outside the loop, or will the JIT take
care of this?
Sometimes it''s cleaner to code this way, sometimes not - but there''s also
auto-generated code, and whether I need to generate code with temps.
thanks
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