From: Jan Beulich <JBeulich@suse.com>
Date: Fri, 31 May 2019 09:53:39 +0000 (-0600)
Subject: Arm64: further speed-up to hweight{32,64}()
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=93099a4afccff96fc29176baba745f687cee1a8f;p=people%2Fsstabellini%2Fxen-unstable.git%2F.git

Arm64: further speed-up to hweight{32,64}()

According to Linux commit e75bef2a4f ("arm64: Select
ARCH_HAS_FAST_MULTIPLIER") this is a further improvement over the
variant using only bitwise operations on at least some hardware, and no
worse on other.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <julien.grall@arm.com>
---

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 581de67b6b..585b57f023 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -12,6 +12,7 @@ config ARM_32
 config ARM_64
 	def_bool y
 	depends on 64BIT
+	select HAS_FAST_MULTIPLY
 
 config ARM
 	def_bool y