Why vectorization didn't turn on by -O2

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To: gcc-help <gcc-help@xxxxxxxxxxx>
Subject: Why vectorization didn't turn on by -O2
From: 172060045@xxxxxxxxxx
Date: Sat, 8 May 2021 20:07:31 +0800 (GMT+08:00)
Cc: rguenther@xxxxxxx, bin.cheng@xxxxxxxxxxxxxxxxx, ook@xxxxxx

Hi all,

Recently I noticed that gcc -O2 didn't turn on vectorization optimization， 
which it turns on in clang -O2.

Does GCC think it involves the trade-off of space speed, or other considerations?

Thanks in advance.

Yancheng

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