From: Xi Ruoyao Date: Tue, 14 May 2024 04:24:18 +0000 (+0800) Subject: LoongArch: Select ARCH_HAS_FAST_MULTIPLIER X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2cce9059599143aa950b0baaf2523b17ab47d27d;p=linux.git LoongArch: Select ARCH_HAS_FAST_MULTIPLIER 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 is comparable to the mainstream x86 and arm64 cores, so we can 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, while __sw_hweight64() for about 30% on LA464 and 33% on LA664. Signed-off-by: Xi Ruoyao Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 54ad04dacdee9..1355ec0c69cca 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