[Xen-devel] [PATCH 2/4] x86: further speed-up to hweight{32,64}()

["Jan Beulich" <JBeulich@xxxxxxxx>]

According to Linux commit 0136611c62 ("optimize hweight64 for x86_64")
this is a further improvement over the variant using only bitwise
operations. It's also a slight further code size reduction.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -12,6 +12,7 @@ config X86
        select HAS_CPUFREQ
        select HAS_EHCI
        select HAS_EX_TABLE
+       select HAS_FAST_MULTIPLY
        select HAS_GDBSX
        select HAS_IOPORTS
        select HAS_KEXEC



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