diff --git a/include/mbedtls/bn_mul.h b/include/mbedtls/bn_mul.h
index 1fc7aa68d..cac3f1457 100644
--- a/include/mbedtls/bn_mul.h
+++ b/include/mbedtls/bn_mul.h
@@ -162,10 +162,6 @@
 
 #define MULADDC_INIT                        \
     asm(                                    \
-        "movq   %3, %%rsi           \n\t"   \
-        "movq   %4, %%rdi           \n\t"   \
-        "movq   %5, %%rcx           \n\t"   \
-        "movq   %6, %%rbx           \n\t"   \
         "xorq   %%r8, %%r8          \n\t"
 
 #define MULADDC_CORE                        \
@@ -181,12 +177,9 @@
         "addq   $8,      %%rdi      \n\t"
 
 #define MULADDC_STOP                        \
-        "movq   %%rcx, %0           \n\t"   \
-        "movq   %%rdi, %1           \n\t"   \
-        "movq   %%rsi, %2           \n\t"   \
-        : "=m" (c), "=m" (d), "=m" (s)                      \
-        : "m" (s), "m" (d), "m" (c), "m" (b)                \
-        : "rax", "rcx", "rdx", "rbx", "rsi", "rdi", "r8"    \
+        : "+c" (c), "+D" (d), "+S" (s)      \
+        : "b" (b)                           \
+        : "rax", "rdx", "r8"                \
     );
 
 #endif /* AMD64 */
diff --git a/library/aesni.c b/library/aesni.c
index 83a5868bd..1ca3c3ef5 100644
--- a/library/aesni.c
+++ b/library/aesni.c
@@ -100,7 +100,7 @@ int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
     asm( "movdqu    (%3), %%xmm0    \n\t" // load input
          "movdqu    (%1), %%xmm1    \n\t" // load round key 0
          "pxor      %%xmm1, %%xmm0  \n\t" // round 0
-         "addq      $16, %1         \n\t" // point to next round key
+         "add       $16, %1         \n\t" // point to next round key
          "subl      $1, %0          \n\t" // normal rounds = nr - 1
          "test      %2, %2          \n\t" // mode?
          "jz        2f              \n\t" // 0 = decrypt
@@ -108,7 +108,7 @@ int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
          "1:                        \n\t" // encryption loop
          "movdqu    (%1), %%xmm1    \n\t" // load round key
          AESENC     xmm1_xmm0      "\n\t" // do round
-         "addq      $16, %1         \n\t" // point to next round key
+         "add       $16, %1         \n\t" // point to next round key
          "subl      $1, %0          \n\t" // loop
          "jnz       1b              \n\t"
          "movdqu    (%1), %%xmm1    \n\t" // load round key
@@ -118,7 +118,7 @@ int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
          "2:                        \n\t" // decryption loop
          "movdqu    (%1), %%xmm1    \n\t"
          AESDEC     xmm1_xmm0      "\n\t" // do round
-         "addq      $16, %1         \n\t"
+         "add       $16, %1         \n\t"
          "subl      $1, %0          \n\t"
          "jnz       2b              \n\t"
          "movdqu    (%1), %%xmm1    \n\t" // load round key