2008-01-30 05:32:31 -07:00
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#
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# Makefile for x86 specific library files.
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#
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obj-$(CONFIG_SMP) := msr-on-cpu.o
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2008-07-03 09:35:41 -06:00
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lib-y := delay.o
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2008-05-12 13:20:42 -06:00
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lib-y += thunk_$(BITS).o
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2008-06-24 14:40:14 -06:00
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lib-y += usercopy_$(BITS).o getuser.o putuser.o
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2008-01-30 05:32:31 -07:00
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lib-y += memcpy_$(BITS).o
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2007-10-11 03:13:35 -06:00
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ifeq ($(CONFIG_X86_32),y)
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2008-01-30 05:32:31 -07:00
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lib-y += checksum_32.o
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lib-y += strstr_32.o
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x86: change x86 to use generic find_next_bit
The versions with inline assembly are in fact slower on the machines I
tested them on (in userspace) (Athlon XP 2800+, p4-like Xeon 2.8GHz, AMD
Opteron 270). The i386-version needed a fix similar to 06024f21 to avoid
crashing the benchmark.
Benchmark using: gcc -fomit-frame-pointer -Os. For each bitmap size
1...512, for each possible bitmap with one bit set, for each possible
offset: find the position of the first bit starting at offset. If you
follow ;). Times include setup of the bitmap and checking of the
results.
Athlon Xeon Opteron 32/64bit
x86-specific: 0m3.692s 0m2.820s 0m3.196s / 0m2.480s
generic: 0m2.622s 0m1.662s 0m2.100s / 0m1.572s
If the bitmap size is not a multiple of BITS_PER_LONG, and no set
(cleared) bit is found, find_next_bit (find_next_zero_bit) returns a
value outside of the range [0, size]. The generic version always returns
exactly size. The generic version also uses unsigned long everywhere,
while the x86 versions use a mishmash of int, unsigned (int), long and
unsigned long.
Using the generic version does give a slightly bigger kernel, though.
defconfig: text data bss dec hex filename
x86-specific: 4738555 481232 626688 5846475 5935cb vmlinux (32 bit)
generic: 4738621 481232 626688 5846541 59360d vmlinux (32 bit)
x86-specific: 5392395 846568 724424 6963387 6a40bb vmlinux (64 bit)
generic: 5392458 846568 724424 6963450 6a40fa vmlinux (64 bit)
Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-03-09 14:01:04 -06:00
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lib-y += semaphore_32.o string_32.o
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2008-01-30 05:32:31 -07:00
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lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
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2007-10-11 03:13:35 -06:00
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else
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2008-01-30 05:32:31 -07:00
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obj-y += io_64.o iomap_copy_64.o
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lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o
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lib-y += thunk_64.o clear_page_64.o copy_page_64.o
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lib-y += memmove_64.o memset_64.o
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lib-y += copy_user_64.o rwlock_64.o copy_user_nocache_64.o
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2007-10-11 03:13:35 -06:00
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endif
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