diff --git a/libavcodec/arm/mathops.h b/libavcodec/arm/mathops.h
index b4fb371739..e889719cea 100644
--- a/libavcodec/arm/mathops.h
+++ b/libavcodec/arm/mathops.h
@@ -59,19 +59,16 @@ static inline av_const int MULH(int a, int b)
 
 static inline av_const int64_t MUL64(int a, int b)
 {
-    union { uint64_t x; unsigned hl[2]; } x;
-    __asm__ ("smull %0, %1, %2, %3"
-             : "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b));
-    return x.x;
+    int64_t x;
+    __asm__ ("smull %Q0, %R0, %1, %2" : "=r"(x) : "r"(a), "r"(b));
+    return x;
 }
 #define MUL64 MUL64
 
 static inline av_const int64_t MAC64(int64_t d, int a, int b)
 {
-    union { uint64_t x; unsigned hl[2]; } x = { d };
-    __asm__ ("smlal %0, %1, %2, %3"
-             : "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b));
-    return x.x;
+    __asm__ ("smlal %Q0, %R0, %1, %2" : "+r"(d) : "r"(a), "r"(b));
+    return d;
 }
 #define MAC64(d, a, b) ((d) = MAC64(d, a, b))
 #define MLS64(d, a, b) MAC64(d, -(a), b)
diff --git a/libavutil/arm/intreadwrite.h b/libavutil/arm/intreadwrite.h
index 339f8856fa..0292aabafd 100644
--- a/libavutil/arm/intreadwrite.h
+++ b/libavutil/arm/intreadwrite.h
@@ -55,22 +55,21 @@ static av_always_inline void AV_WN32(void *p, uint32_t v)
 #define AV_RN64 AV_RN64
 static av_always_inline uint64_t AV_RN64(const void *p)
 {
-    union { uint64_t v; uint32_t hl[2]; } v;
-    __asm__ ("ldr   %0, %2  \n\t"
-             "ldr   %1, %3  \n\t"
-             : "=&r"(v.hl[0]), "=r"(v.hl[1])
+    uint64_t v;
+    __asm__ ("ldr   %Q0, %1  \n\t"
+             "ldr   %R0, %2  \n\t"
+             : "=&r"(v)
              : "m"(*(const uint32_t*)p), "m"(*((const uint32_t*)p+1)));
-    return v.v;
+    return v;
 }
 
 #define AV_WN64 AV_WN64
 static av_always_inline void AV_WN64(void *p, uint64_t v)
 {
-    union { uint64_t v; uint32_t hl[2]; } vv = { v };
-    __asm__ ("str  %2, %0  \n\t"
-             "str  %3, %1  \n\t"
+    __asm__ ("str  %Q2, %0  \n\t"
+             "str  %R2, %1  \n\t"
              : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
-             : "r"(vv.hl[0]), "r"(vv.hl[1]));
+             : "r"(v));
 }
 
 #endif /* HAVE_INLINE_ASM */