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Index: head/lib/libc/amd64/string/memmove.S
===================================================================
--- head/lib/libc/amd64/string/memmove.S
+++ head/lib/libc/amd64/string/memmove.S
@@ -139,6 +139,8 @@
ALIGN_TEXT
1256:
+ testb $15,%dil
+ jnz 100f
.if \erms == 1
rep
movsb
@@ -146,6 +148,34 @@
shrq $3,%rcx /* copy by 64-bit words */
rep
movsq
+ movq %rdx,%rcx
+ andl $7,%ecx /* any bytes left? */
+ jne 100408b
+.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
Index: head/sys/amd64/amd64/support.S
===================================================================
--- head/sys/amd64/amd64/support.S
+++ head/sys/amd64/amd64/support.S
@@ -302,6 +302,8 @@
ALIGN_TEXT
1256:
+ testb $15,%dil
+ jnz 100f
.if \erms == 1
rep
movsb
@@ -309,6 +311,34 @@
shrq $3,%rcx /* copy by 64-bit words */
rep
movsq
+ movq %rdx,%rcx
+ andl $7,%ecx /* any bytes left? */
+ jne 100408b
+.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

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