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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>, Michal Marek <mmarek@suse.cz>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	lkml <linux-kernel@vger.kernel.org>
Subject: subtle side effect of  commit a1c48bb160f836
Date: Thu, 18 Jun 2015 12:17:02 +0530	[thread overview]
Message-ID: <55826966.6050202@synopsys.com> (raw)

Hi Geert,

commit a1c48bb160f8368 "Makefile: Fix unrecognized cross-compiler command line
options" moved ARCH specific cc option handling before common -Os/O2 setup.

For ARC this had a subtle effect that we can no longer over-ride generic -O2 with
-O3, hence a performance regression observed going from 3.13 to 3.18 (the above
commit went into 3.16)

I want to understand how to properly fix this. Moving the include of arch makefile
will bring back the old issue. I can introduce another option to set default optim
level, but only arc/m32r care about it anyways.

Thx,
-Vineet

             reply	other threads:[~2015-06-18  6:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-18  6:47 Vineet Gupta [this message]
2015-06-18  7:10 ` subtle side effect of commit a1c48bb160f836 Geert Uytterhoeven
2015-06-18  7:33   ` Vineet Gupta
2015-06-18  7:37     ` Geert Uytterhoeven
2015-06-18  8:00       ` Vineet Gupta
2015-06-18  8:13   ` Michal Marek
2015-06-18  8:45     ` Vineet Gupta
2015-06-18  8:45       ` Vineet Gupta
2015-06-18  8:45       ` Vineet Gupta
2015-06-18  8:55       ` Geert Uytterhoeven
2015-06-18  9:16         ` Vineet Gupta
2015-06-18 10:14       ` Michal Marek
2015-06-18 10:32         ` Vineet Gupta
2015-06-24 12:20           ` Vineet Gupta
2015-07-01 15:19             ` Michal Marek
2015-07-01 15:19               ` Michal Marek
2015-07-01 15:19               ` Michal Marek
2015-07-02  5:27               ` ARC build -O3 (was Re: subtle side effect of commit a1c48bb160f836) Vineet Gupta
2015-07-02  5:27                 ` Vineet Gupta
2015-07-02  5:27                 ` Vineet Gupta
2015-07-02 19:50                 ` Michal Marek
2015-07-03  2:58                   ` Vineet Gupta

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