Vladimir Makarov wrote:
Although it is not right argument to what you mean. But example about vectorization would be right. ICC vectorizes many more loops than gcc does. Vectorized loops is much bigger in size than their non-vectorized variants. So faster code does not mean smaller code in general. There are a lot of optimization which makes code bigger and faster: like function versioning (based on argument values), aggressive inlining, modulo scheduling, vectorization, loop unrolling, loop versioning, loop tiling etc. So even if the both compiler do the same optimizations and if one compiler is more successful in such optimizations, the generated code will be bigger and faster.
Sure, we can all find such examples, but if you take a large program, (say hundreds of thousands of lines), you will find that the speed vs size relation holds pretty well.
