asm for memmove on i386 and x86_64

[musl] / src / string / i386 / memmove.s

diff --git a/src/string/i386/memmove.s b/src/string/i386/memmove.s
new file mode 100644 (file)
index 0000000..6e6cc8e
--- /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