Messages in this thread | | | Date | Thu, 29 Dec 2005 03:02:42 -0500 | From | Dave Jones <> | Subject | Re: [patch 00/2] improve .text size on gcc 4.0 and newer compilers |
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On Thu, Dec 29, 2005 at 08:41:07AM +0100, Ingo Molnar wrote: > > * Krzysztof Halasa <khc@pm.waw.pl> wrote: > > > Ingo Molnar <mingo@elte.hu> writes: > > > > >> gcc version 4.0.2 20051109 (Red Hat 4.0.2-6) > > > > > another thing: i wanted to decrease the size of -Os > > > (CONFIG_CC_OPTIMIZE_FOR_SIZE) kernels, which e.g. Fedora uses too (to > > > keep the icache footprint down). > > > > Remember the above gcc miscompiles the x86-32 kernel with -Os: > > > > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=173764 > > i'm not sure what the point is. There was no sudden rush of -Os related > bugs when Fedora switched to it for the kernel, and the 35% code-size > savings were certainly worth it in terms of icache footprint. Yes, -Os > is a major change for how the compiler works, and the kernel is a major > piece of software.
The bug referenced is also fixed in gcc 4.1
Dave
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