From: Xi Ruoyao <xry111@xry111.site>
Date: Sat, 6 Dec 2025 02:39:39 +0000 (+0800)
Subject: LoongArch: Simplify __arch_bitrev32() implementation
X-Git-Tag: v6.19-rc1~21^2~20
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17fcc4bd7edcd74bae286754ac3a377c9886b3fd;p=thirdparty%2Flinux.git

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 46f275b9cdf75..757738ea38d76 100644
--- 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;
 }