what 's the optimize option -O2 do?

what 's the optimize option -O2 do?

What 's the optimize option -O2 do?

When i was using icpc to compile my project on linux with -g -O2. I found a segment fault error. While It works when I delete -O2. So how many detail options in  -O2 ? How can I fix my problem?

BTW, I used makecontext when I was generating fiber threads.

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For more complete information about compiler optimizations, see our Optimization Notice.

>>...What 's the optimize option -O2 do?

/O2 - optimize for maximum speed (DEFAULT)

>>...So how many detail options in -O2?..

Please take a look at Intel C++ compiler User's and Reference Guide for a complete description of that option ( online or in pdf-format )

>>How can I fix my problem?
>>
>>BTW, I used makecontext when I was generating fiber threads...

A reproducer is needed to help with understanding what is wrong.

Thanks Sergey Kostrov

I is hard to post my project as it is too large!

I've tested to add -fno-builtin option in a test project!  With this option, I got the same assemble code using gcc and icc in a test code. I will test it in my project. I will post further result if i get some error.

I fixed this problems by add -fno-builtin and -fno-inline 。THS

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