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Message-ID: <20120820094234.GB16230@one.firstfloor.org> Date: Mon, 20 Aug 2012 11:42:34 +0200 From: Andi Kleen <andi@...stfloor.org> To: Avi Kivity <avi@...hat.com> Cc: Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org, x86@...nel.org, mmarek@...e.cz, linux-kbuild@...r.kernel.org, JBeulich@...e.com, akpm@...ux-foundation.org, Andi Kleen <ak@...ux.intel.com> Subject: Re: [PATCH 46/74] x86, lto: Disable fancy hweight optimizations for LTO > > config ARCH_HWEIGHT_CFLAGS > > string > > - default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 > > - default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 > > + default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 && !LTO > > + default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 && !LTO > > + default "" if LTO > > > > Seems heavy handed. How about using __attribute__((optimize(...))) instead? Doesn't work for this. In fact according to the gcc developers that attribute is mostly broken. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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