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Index: lib/libc/amd64/string/bcopy.S
===================================================================
--- lib/libc/amd64/string/bcopy.S
+++ lib/libc/amd64/string/bcopy.S
@@ -66,6 +66,9 @@
movsq
movq %rdx,%rcx
andq $7,%rcx /* any bytes left? */
+ jne 2f
+ ret
+2:
rep
movsb
ret
@@ -73,11 +76,13 @@
addq %rcx,%rdi /* copy backwards. */
addq %rcx,%rsi
std
- andq $7,%rcx /* any fractional bytes? */
decq %rdi
decq %rsi
+ andq $7,%rcx /* any fractional bytes? */
+ je 3f
rep
movsb
+3:
movq %rdx,%rcx /* copy remainder by words */
shrq $3,%rcx
subq $7,%rsi
Index: lib/libc/i386/string/bcopy.S
===================================================================
--- lib/libc/i386/string/bcopy.S
+++ lib/libc/i386/string/bcopy.S
@@ -72,6 +72,11 @@
movsl
movl %edx,%ecx
andl $3,%ecx /* any bytes left? */
+ jne 2f
+ popl %edi
+ popl %esi
+ ret
+2:
rep
movsb
popl %edi
@@ -82,11 +87,13 @@
addl %ecx,%esi
std
movl %ecx,%edx
- andl $3,%ecx /* any fractional bytes? */
decl %edi
decl %esi
+ andl $3,%ecx /* any fractional bytes? */
+ jne 3f
rep
movsb
+3:
movl %edx,%ecx /* copy remainder by words */
shrl $2,%ecx
subl $3,%esi

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