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1ee3630a3e
ARCH_USE_BUILTIN_BSWAP will use __builtin_bswap16(), __builtin_bswap32() and __builtin_bswap64() where available. This allows better instruction scheduling. On pre-R2 processors it will result in 32 bit and 64 bit swapping being performed in a call to a __bswapsi2() rsp. __bswapdi2() functions, so we add these, too. For a 4.2 kernel with GCC 4.9 this yields the following kernel sizes: text data bss dec hex filename 3996071 155804 88992 4240867 40b5e3 vmlinux ip22 baseline 3985687 159900 88992 4234579 409d53 vmlinux ip22 + bswap patch 6913157 378552 251024 7542733 7317cd vmlinux ip27 baseline 6878581 378552 251024 7508157 7290bd vmlinux ip27 + bswap patch 5773777 268752 187424 6229953 5f0fc1 vmlinux malta baseline 5773401 268752 187424 6229577 5f0e49 vmlinux malta + bswap patch Presumably the code size improvments yield better cache hit rate thus better performance compensating for the extra function call but this will still need to be benchmarked. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
18 lines
569 B
Makefile
18 lines
569 B
Makefile
#
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# Makefile for MIPS-specific library files..
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#
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lib-y += bitops.o csum_partial.o delay.o memcpy.o memset.o \
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mips-atomic.o strlen_user.o strncpy_user.o \
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strnlen_user.o uncached.o
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obj-y += iomap.o
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obj-$(CONFIG_PCI) += iomap-pci.o
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lib-$(CONFIG_GENERIC_CSUM) := $(filter-out csum_partial.o, $(lib-y))
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obj-$(CONFIG_CPU_GENERIC_DUMP_TLB) += dump_tlb.o
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obj-$(CONFIG_CPU_R3000) += r3k_dump_tlb.o
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obj-$(CONFIG_CPU_TX39XX) += r3k_dump_tlb.o
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# libgcc-style stuff needed in the kernel
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obj-y += ashldi3.o ashrdi3.o bswapsi.o bswapdi.o cmpdi2.o lshrdi3.o ucmpdi2.o
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