From fb481dd56adf3c5b0993b8f052cc9ba966e3959d Mon Sep 17 00:00:00 2001
From: Andi Kleen <andi@firstfloor.org>
Date: Thu, 4 Sep 2008 13:46:11 +0200
Subject: x86: drop -funroll-loops for csum_partial_64.c
Impact: performance optimization
I did some rebenchmarking with modern compilers and dropping
-funroll-loops makes the function consistently go faster by a few
percent. So drop that flag.
Thanks to Richard Guenther for a hint.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/lib/Makefile | 3 ---
1 file changed, 3 deletions(-)
(limited to 'arch')
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index aa3fa41..55e11aa 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -17,9 +17,6 @@ ifeq ($(CONFIG_X86_32),y)
lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
else
obj-y += io_64.o iomap_copy_64.o
-
- CFLAGS_csum-partial_64.o := -funroll-loops
-
lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o
lib-y += thunk_64.o clear_page_64.o copy_page_64.o
lib-y += memmove_64.o memset_64.o
--
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