Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756769Ab2HSDD2 (ORCPT ); Sat, 18 Aug 2012 23:03:28 -0400 Received: from mga11.intel.com ([192.55.52.93]:44069 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753544Ab2HSC5i (ORCPT ); Sat, 18 Aug 2012 22:57:38 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.77,792,1336374000"; d="scan'208";a="210415454" From: Andi Kleen To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, mmarek@suse.cz, linux-kbuild@vger.kernel.org, JBeulich@suse.com, akpm@linux-foundation.org, Andi Kleen Subject: [PATCH 46/74] x86, lto: Disable fancy hweight optimizations for LTO Date: Sat, 18 Aug 2012 19:56:42 -0700 Message-Id: <1345345030-22211-47-git-send-email-andi@firstfloor.org> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <1345345030-22211-1-git-send-email-andi@firstfloor.org> References: <1345345030-22211-1-git-send-email-andi@firstfloor.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2303 Lines: 73 From: Andi Kleen The fancy x86 hweight uses different compiler options for the hweight file. This does not work with LTO. Just disable the optimization with LTO Signed-off-by: Andi Kleen --- arch/x86/Kconfig | 5 +++-- arch/x86/include/asm/arch_hweight.h | 9 +++++++++ 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8ec3a1a..9382b09 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -224,8 +224,9 @@ config X86_32_LAZY_GS 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 config ARCH_CPU_PROBE_RELEASE def_bool y diff --git a/arch/x86/include/asm/arch_hweight.h b/arch/x86/include/asm/arch_hweight.h index 9686c3d..ca80549 100644 --- a/arch/x86/include/asm/arch_hweight.h +++ b/arch/x86/include/asm/arch_hweight.h @@ -25,9 +25,14 @@ static inline unsigned int __arch_hweight32(unsigned int w) { unsigned int res = 0; +#ifdef CONFIG_LTO + res = __sw_hweight32(w); +#else + asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT) : "="REG_OUT (res) : REG_IN (w)); +#endif return res; } @@ -46,6 +51,9 @@ static inline unsigned long __arch_hweight64(__u64 w) { unsigned long res = 0; +#ifdef CONFIG_LTO + res = __sw_hweight64(w); +#else #ifdef CONFIG_X86_32 return __arch_hweight32((u32)w) + __arch_hweight32((u32)(w >> 32)); @@ -54,6 +62,7 @@ static inline unsigned long __arch_hweight64(__u64 w) : "="REG_OUT (res) : REG_IN (w)); #endif /* CONFIG_X86_32 */ +#endif return res; } -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/