[Xen-changelog] [xen staging] x86: further speed-up to hweight{32, 64}()

[patchbot@xxxxxxx]

commit 291c68f10e8ec6dc46737f27617949fd2f04e6ef
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jun 3 17:21:05 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 3 17:21:05 2019 +0200

    x86: further speed-up to hweight{32,64}()
    
    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>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index 4b8b07b549..f502d765ba 100644
--- 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
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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