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LoongArch has the bitrev.w instruction to reverse bits in a 32-bit integer, thus there's no need to reverse the bytes and use bitrev.4b. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>