summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/string/i386/memcpy.s29
-rw-r--r--src/string/x86_64/memcpy.s22
2 files changed, 51 insertions, 0 deletions
diff --git a/src/string/i386/memcpy.s b/src/string/i386/memcpy.s
new file mode 100644
index 00000000..b2977c89
--- /dev/null
+++ b/src/string/i386/memcpy.s
@@ -0,0 +1,29 @@
+.global memcpy
+.type memcpy,@function
+memcpy:
+ push %esi
+ push %edi
+ mov 12(%esp),%edi
+ mov 16(%esp),%esi
+ mov 20(%esp),%ecx
+ mov %edi,%eax
+ cmp $4,%ecx
+ jc 1f
+ test $3,%edi
+ jz 1f
+2: movsb
+ dec %ecx
+ test $3,%edi
+ jnz 2b
+1: mov %ecx,%edx
+ shr $2,%ecx
+ rep
+ movsl
+ and $3,%edx
+ jz 1f
+2: movsb
+ dec %edx
+ jnz 2b
+1: pop %edi
+ pop %esi
+ ret
diff --git a/src/string/x86_64/memcpy.s b/src/string/x86_64/memcpy.s
new file mode 100644
index 00000000..1282dc3b
--- /dev/null
+++ b/src/string/x86_64/memcpy.s
@@ -0,0 +1,22 @@
+.global memcpy
+.type memcpy,@function
+memcpy:
+ mov %rdi,%rax
+ cmp $8,%rdx
+ jc 1f
+ test $7,%edi
+ jz 1f
+2: movsb
+ dec %rdx
+ test $7,%edi
+ jnz 2b
+1: mov %rdx,%rcx
+ shr $3,%rcx
+ rep
+ movsq
+ and $7,%edx
+ jz 1f
+2: movsb
+ dec %edx
+ jnz 2b
+1: ret