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Date: Mon, 10 Nov 2008 09:38:58 +0100 From: Andi Kleen <andi@...stfloor.org> To: Harvey Harrison <harvey.harrison@...il.com> Cc: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [RFC-PATCH] x86: really use __builtin_memcmp on x86_32 Harvey Harrison <harvey.harrison@...il.com> writes: > Impact: prevent generic code from overriding __builtin_memcmp > > lib/string.c was using a generic implementation of memcmp > because __HAVE_ARCH_MEMCMP was not defined and it was then doing > #undef memcmp and defining a generic version. gcc sometimes decides to not inline memcmp, so an out of line version is always needed even when __builtin_memcmp is used. While in theory x86 could supply an optimized version, memcmp is relatively rarely used (and in many cases inlined), so adding an assembler version for x86 is likely not worth it. -Andi -- ak@...ux.intel.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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