This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

[PATCH, i386] Avoid SLP vectorization if vector and scalar costs are equal.

From: "Shalnov, Sergey" <sergey dot shalnov at intel dot com>
To: "'gcc-patches at gcc dot gnu dot org'" <gcc-patches at gcc dot gnu dot org>
Cc: "Koval, Julia" <julia dot koval at intel dot com>, "Peryt, Sebastian" <sebastian dot peryt at intel dot com>, "Ivchenko, Alexander" <alexander dot ivchenko at intel dot com>, 'Uros Bizjak' <ubizjak at gmail dot com>, "Kirill Yukhin" <kirill dot yukhin at gmail dot com>
Date: Wed, 27 Dec 2017 13:00:10 +0000
Subject: [PATCH, i386] Avoid SLP vectorization if vector and scalar costs are equal.
Authentication-results: sourceware.org; auth=none
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.0.0.116

Hi,
Should we use vector instructions if the scalar and vector costs in SLP are the same?
According to the source line comment (already in source code) we should not
use vector instructions in this case.

I would like to propose to use scalars if costs are the same.

Sergey

2017-12-27  Sergey Shalnov  <Sergey.Shalnov@intel.com>
gcc/
	* tree-vect-slp.c (vect_bb_vectorization_profitable_p):
	Avoid SLP vectorization if vector and scalar costs are
	equal.

Attachment: 0010-SLP-vectorizeing-decision.patch
Description: 0010-SLP-vectorizeing-decision.patch

Follow-Ups:
- Re: [PATCH, i386] Avoid SLP vectorization if vector and scalar costs are equal.
  - From: Marc Glisse

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]