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I don't have icc installed but I need a list of all compiler optimization flags. I tried Google and searching through their website documentation but I just cannot find anything.
I found a list of all compiler options but I just need the optimization ones.
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Turning on optimization flags makes the compiler attempt to improve the performance and/or code size at the expense of compilation time and possibly the ability to debug the program. The compiler performs optimization based on the knowledge it has of the program.
GCC 64 Bit O3 is marginally better than ICC 64 Bit O2. The difference is less than 3%. 500.
GCC has a range of optimization levels, plus individual options to enable or disable particular optimizations. The overall compiler optimization level is controlled by the command line option -On, where n is the required optimization level, as follows: -O0 . (default).
-O3 : the highest level of optimization possible. It enables optimizations that are expensive in terms of compile time and memory usage. Compiling with -O3 is not a guaranteed way to improve performance, and in fact, in many cases, can slow down a system due to larger binaries and increased memory usage.
This page lists IC optimization flags - https://software.intel.com/en-us/node/522802. This page doesn't show up with Google search. You need to search within https://software.intel.com
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