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Diffstat (limited to 'src/string')
-rw-r--r--src/string/i386/memmove.s21
-rw-r--r--src/string/x86_64/memmove.s15
2 files changed, 36 insertions, 0 deletions
diff --git a/src/string/i386/memmove.s b/src/string/i386/memmove.s
new file mode 100644
index 00000000..6e6cc8e3
--- /dev/null
+++ b/src/string/i386/memmove.s
@@ -0,0 +1,21 @@
+.global memmove
+.type memmove,@function
+memmove:
+ mov 4(%esp),%eax
+ sub 8(%esp),%eax
+ cmp 12(%esp),%eax
+ jae memcpy
+ push %esi
+ push %edi
+ mov 12(%esp),%edi
+ mov 16(%esp),%esi
+ mov 20(%esp),%ecx
+ lea -1(%edi,%ecx),%edi
+ lea -1(%esi,%ecx),%esi
+ std
+ rep movsb
+ cld
+ lea 1(%edi),%eax
+ pop %edi
+ pop %esi
+ ret
diff --git a/src/string/x86_64/memmove.s b/src/string/x86_64/memmove.s
new file mode 100644
index 00000000..247f0ac3
--- /dev/null
+++ b/src/string/x86_64/memmove.s
@@ -0,0 +1,15 @@
+.global memmove
+.type memmove,@function
+memmove:
+ mov %rdi,%rax
+ sub %rsi,%rax
+ cmp %rdx,%rax
+ jae memcpy
+ mov %rdx,%rcx
+ lea -1(%rdi,%rdx),%rdi
+ lea -1(%rsi,%rdx),%rsi
+ std
+ rep movsb
+ cld
+ lea 1(%rdi),%rax
+ ret