Re: [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig
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- Subject: Re: [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig
- From: Steven Rostedt <rostedt@xxxxxxxxxxx>
- Date: Sat, 26 Jan 2013 16:02:47 -0500
- Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, ling.ml@xxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <CA+55aFyskO6NMhgkwRNv4wXB=D97VS54_oZw0k_o4nQFso6p-Q@mail.gmail.com>
On Sat, 2013-01-26 at 11:43 -0800, Linus Torvalds wrote:
> The problem, of course, is that most -O2 code generation is done
> assuming hot loops that don't show much if any I$ issues. And the -Os
> thing is done *purely* for size, not taking any performance into
> account at all. There's no balanced middle ground, which is what _we_
> would want.
Gcc needs to implement a -Olinus
;-)
-- Steve
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