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by wichtounet 3494 days ago
It's not free for commercial use. And it's probably the slowest compiler there is although the generated assembly is generally of incredible quality.
1 comments
colejohnson66 3494 days ago
It's slow because of the multiple times it has to compile and optimize for all the different processor revisions.
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greglindahl 3494 days ago
Does it? Last I looked it did 1 by default, 2 if you ask nicely.

The main reason it's slow is that it does a lot of analysis, even at -O1.

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colejohnson66 3494 days ago
It was my understanding that the advantage of Intel's compiler is that it would optimize for the strengths available on newer processors while still allowing it to work on older processors (for example, using AVX instructions if available and a slower branch if not) [aka, the "CPU dispatcher"]. Agner wrote about it "crippling" AMD processors because they didn't say they were "GenuineIntel" back in 2009.[0]

[0]: http://www.agner.org/optimize/blog/read.php?i=49

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