diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S
index 5a25dc1d969..1b0e4aec093 100644
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@@ -396,8 +396,6 @@ END(memcmp)
 
 	ALIGN_TEXT
 1256:
-	testb	$15,%dil
-	jnz	100f
 .if \erms == 1
 	rep
 	movsb
@@ -411,34 +409,6 @@ END(memcmp)
 .endif
 	\end
 	ret
-100:
-	movq	(%rsi),%r8
-	movq	8(%rsi),%r9
-	movq	%rdi,%r10
-	movq	%rdi,%rcx
-	andq	$15,%rcx
-	leaq	-16(%rdx,%rcx),%rdx
-	neg	%rcx
-	leaq	16(%rdi,%rcx),%rdi
-	leaq	16(%rsi,%rcx),%rsi
-	movq	%rdx,%rcx
-.if \erms == 1
-	rep
-	movsb
-	movq	%r8,(%r10)
-	movq	%r9,8(%r10)
-.else
-	shrq	$3,%rcx                         /* copy by 64-bit words */
-	rep
-	movsq
-	movq	%r8,(%r10)
-	movq	%r9,8(%r10)
-	movq	%rdx,%rcx
-	andl	$7,%ecx                         /* any bytes left? */
-	jne	100408b
-.endif
-	\end
-	ret
 
 .if \overlap == 1
 	/*