gcc也可以指定用多媒体指令的，你看一下gcc 的manpage就知道了 据我知道不是指令集上的问题，而是intel用了一个vector library, 所以做数学运算的时候有些优势。 你可以写一个计算上万次sin的程序，分别用icc和gcc上用一下，试试看。
Regards, Yan, Zheng -----Original Message----- From: ??? [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 10, 2004 8:46 PM To: Min Xu Subject: Re: GCC 估计是用了一些SSEx指令吧 还有intel对自己cpu的流水线最清楚，作的比gcc好一点也不奇怪 ----- Original Message ----- From: "Min Xu" <[EMAIL PROTECTED]> To: "Yan, Zheng" <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Wednesday, March 10, 2004 12:27 PM Subject: Re: GCC > Yan, Zheng wrote: > > GCC 是跨平台的compiler > > icc 目前来说只支持x86 > > > > 况且，intel说的20%究竟怎么样测的，我们也不晓得 > > ps. kernel 目前不能用icc编译 (至少有些问题没解决，我在intel的朋友告诉我的) > > Usually when measuring performance, people use benchmark suite, such as > SPEC. > The average performance is used to compare two products. I had some > experience with icc. > It made my C program 5% faster and had no noticable difference to my C++ > program. > > That said, I think how good is icc/gcc really depends on _your_ program. > Only the difference > they make on _your_ program matters the most to you. You just need to > try it out. > > Personally, I like gcc since it is open source and widely used. (But I > hate STL from GCC > though ;-) ) icc may have better compiler optimization algorithms, but > they usually works > only for limited programs. Plus, the difference isn't really that much > (considering you are > usually limited by other things, like disks), if any. > > -- > Shopping for food while listening to a Bach violin concerto completely > remakes the experience. It turns you from a grazing animal into > something finer. > - http://news.bbc.co.uk/2/hi/technology/3542391.stm > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
