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Commit 423216ed authored by Anton Blanchard's avatar Anton Blanchard Committed by Michael Ellerman
Browse files

powerpc: Use CONFIG_ARCH_HAS_FAST_MULTIPLIER 



I ran some tests to compare hash_64 using shifts and multiplies.
The results:

POWER6:	~2x slower
POWER7: ~2x faster
POWER8: ~2x faster

Now we have a proper config option, select
CONFIG_ARCH_HAS_FAST_MULTIPLIER on POWER7 and POWER8.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent ff2e466a

arch/powerpc/platforms/Kconfig.cputype

+2 −0
Original line number Diff line number Diff line
@@ -116,10 +116,12 @@ config POWER6_CPU 
config POWER7_CPU

	bool "POWER7"

	depends on PPC_BOOK3S_64

	select ARCH_HAS_FAST_MULTIPLIER



config POWER8_CPU

	bool "POWER8"

	depends on PPC_BOOK3S_64

	select ARCH_HAS_FAST_MULTIPLIER



config E5500_CPU

	bool "Freescale e5500"