Messages in this thread | | | From | Huacai Chen <> | Date | Fri, 29 Mar 2024 10:09:46 +0800 | Subject | Re: [PATCH] LoongArch: Select ARCH_HAS_FAST_MULTIPLIER |
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Queued for loongarch-next, thanks.
Huacai
On Thu, Mar 28, 2024 at 1:18 AM Xi Ruoyao <xry111@xry111.site> wrote: > > LA464 and LA664 can do 32-bit/64-bit integer multiplication with a > latency of 4 cycles and a throughput of 2 ops per cycle. It's > comparable to mainstream x86 and arm64 cores, so select > ARCH_HAS_FAST_MULTIPLIER like them. > > It speeds up __sw_hweight32 in lib/hweight.c for about 14% on LA464 and > 11% on LA664, and __sw_hweight64 for about 30% on LA464 and 33% on > LA664. > > Signed-off-by: Xi Ruoyao <xry111@xry111.site> > --- > arch/loongarch/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig > index 5a769bb92d7c..d52a95195e7f 100644 > --- a/arch/loongarch/Kconfig > +++ b/arch/loongarch/Kconfig > @@ -16,6 +16,7 @@ config LOONGARCH > select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI > select ARCH_HAS_CPU_FINALIZE_INIT > select ARCH_HAS_CURRENT_STACK_POINTER > + select ARCH_HAS_FAST_MULTIPLIER > select ARCH_HAS_FORTIFY_SOURCE > select ARCH_HAS_KCOV > select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS > -- > 2.44.0 >
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