diff --git a/simde/x86/clmul.h b/simde/x86/clmul.h
index e2d8b4cf8..7d51b5b3f 100644
--- a/simde/x86/clmul.h
+++ b/simde/x86/clmul.h
@@ -101,6 +101,10 @@ simde_x_bitreverse_u64(uint64_t v) {
     return HEDLEY_STATIC_CAST(uint64_t, _mm_cvtsi128_si64(vec));
   #elif HEDLEY_HAS_BUILTIN(__builtin_bitreverse64)
     return __builtin_bitreverse64(v);
+  #elif defined(__loongarch64)
+    uint64_t r;
+    __asm__ __volatile__ ("bitrev.d %0, %1" :"=&r"(r):"r"(v):);
+    return r;
   #else
     v = ((v >>  1) & UINT64_C(0x5555555555555555)) | ((v & UINT64_C(0x5555555555555555)) <<  1);
     v = ((v >>  2) & UINT64_C(0x3333333333333333)) | ((v & UINT64_C(0x3333333333333333)) <<  2);