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Re: -O3 vs. -Os

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Re: -O3 vs. -Os

Subject: Re: -O3 vs. -Os
From: Stefan Werner <email@hidden>
Date: Tue, 17 Jan 2006 23:08:39 +0100

Because OO languages often have accessors, for any given algorithm,
they are likely to call more functions than say, C. Yet with higher
optimization, the compiler can inline most of those small-function
calls, especially accessors.

Especially when taking advantage of C++ features like operator overloading, -O3 and function inlining can make a huge difference. Imagine using a C++ class representing a vector, and you use operator overloading for cross and dot product, rotations, etc. Or take OpenEXR for example, it's implementing a half precision floating point class in 16 bits. Without inlining, such code becomes incredibly slow.

Stefan
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