LoongArch: Simplify __arch_bitrev32() implementation

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>

diff --git a/arch/loongarch/include/asm/bitrev.h b/arch/loongarch/include/asm/bitrev.h
index 46f275b9cdf7566726383e0adeab14a9b87afc5c..757738ea38d764be99cacee92a56496d0cccdcbf 100644 (file)
--- a/arch/loongarch/include/asm/bitrev.h
+++ b/arch/loongarch/include/asm/bitrev.h
@@ -11,7 +11,7 @@ static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
 {
        u32 ret;
 
-       asm("bitrev.4b  %0, %1" : "=r"(ret) : "r"(__swab32(x)));
+       asm("bitrev.w   %0, %1" : "=r"(ret) : "r"(x));
        return ret;
 }