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Date: Thu, 06 Feb 2014 18:51:00 -0000
Message-ID: <CAFULd4YhywBqWHZX6Oehbzmx98X1g5Gw+4LMHuccx=H0Ygt3wQ@mail.gmail.com>
Subject: -O3 and -ftree-vectorize
From: Uros Bizjak <ubizjak@gmail.com>
To: GCC Development <gcc@gcc.gnu.org>
Cc: Jakub Jelinek <jakub@redhat.com>, Richard Biener <rguenther@suse.de>
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X-SW-Source: 2014-02/txt/msg00051.txt.bz2

Hello!

4.9 does not enable -ftree-vectorize for -O3 (and Ofast) anymore. Is
this intentional?

$/ssd/uros/gcc-build/gcc/xgcc -B /ssd/uros/gcc-build/gcc -O3 -Q
--help=optimizers

...
-ftree-vectorize                      [disabled]
...

This is the reason for low scores on SciMark v2.0 as conducted by
Phoronix. Please see comment #18 in [1].

[1] http://phoronix.com/forums/showthread.php?95147-Clang-s-Competition-For-GCC-On-Intel-Haswell/page2

Uros.