Does gcc -Ofast enable vectorization?

Asked May 30 '16 at 15:07

Active Dec 20 '18 at 07:53

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I am currently compiling spec2000 art benchmark using following 2 flag settings:

-Ofast -m32 -march=native
-Ofast -m32 -march=native -fno-tree-vectorize

The second setting just disable the vectorizer. However, when I checked the objdump of the 2 settings, both of them shows some packed instructions like vmovapd, vxorpd, etc.

Can anyone provide some explanations? Thanks.

edited Dec 20 '18 at 07:53

yugr

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asked May 30 '16 at 15:07

PST

Possible duplicate of [Strange gcc6.1 -O2 compiling behaviour](http://stackoverflow.com/questions/37549268/strange-gcc6-1-o2-compiling-behaviour) – Cody Gray - on strike May 31 '16 at 15:54

Does gcc -Ofast enable vectorization?

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