By using the compiler intrinsics instead of hand-crafted opaque inline assembler for byte-swapping, we let the compiler see what's actually happening and it gets to use lwbrx/stwbrx instructions instead of a normal load/store coupled with a sequence of rlwimi instructions to move bits around. Compiled-tested only. It gave a code size reduction of almost 4% for ext2, and more like 2.5% for ext3/ext4. Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx> Acked-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 951a517..064e418 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -146,6 +146,7 @@ config PPC select MODULES_USE_ELF_RELA select GENERIC_KERNEL_EXECVE select CLONE_BACKWARDS + select ARCH_USE_BUILTIN_BSWAP config EARLY_PRINTK bool -- 1.8.0.1 -- dwmw2
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