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| author | Xi Ruoyao <xry111@xry111.site> | 2024-05-14 07:24:18 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-05-14 07:24:18 +0300 |
| commit | 2cce9059599143aa950b0baaf2523b17ab47d27d (patch) | |
| tree | 3b52495b349413fe801eb0e3086f9dec3df0ba81 /arch/loongarch | |
| parent | a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6 (diff) | |
| download | linux-2cce9059599143aa950b0baaf2523b17ab47d27d.tar.xz | |
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 <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
| -rw-r--r-- | arch/loongarch/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 54ad04dacdee..1355ec0c69cc 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 |