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authorRich Felker <dalias@aerifal.cx>2012-08-11 21:33:13 -0400
committerRich Felker <dalias@aerifal.cx>2012-08-11 21:33:13 -0400
commitaaa9eb5101e3a748218fb9373dd9655b50582da2 (patch)
tree3b756d667add7460ff46739c965b380c00471166 /src/string/x86_64
parent036eaa24cf573c69982ba18dd427de68f6eeba2a (diff)
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memcpy asm for i386 and x86_64
Diffstat (limited to 'src/string/x86_64')
-rw-r--r--src/string/x86_64/memcpy.s22
1 files changed, 22 insertions, 0 deletions
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