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-rw-r--r--src/string/i386/memset.s47
-rw-r--r--src/string/x86_64/memset.s41
2 files changed, 88 insertions, 0 deletions
diff --git a/src/string/i386/memset.s b/src/string/i386/memset.s
new file mode 100644
index 00000000..06ac923e
--- /dev/null
+++ b/src/string/i386/memset.s
@@ -0,0 +1,47 @@
+.global memset
+.type memset,@function
+memset:
+ mov 8(%esp),%al
+ push %edi
+ mov %al,%ah
+ mov %al,%dl
+ mov 16(%esp),%ecx
+ shl $16,%eax
+ mov 8(%esp),%edi
+ mov %dl,%al
+ mov %dl,%ah
+ cmp $16,%ecx
+ jb 1f
+
+ mov %eax,-4(%edi,%ecx)
+ shr $2,%ecx
+ rep
+ stosl
+ mov 8(%esp),%eax
+ pop %edi
+ ret
+
+1: test %ecx,%ecx
+ jz 1f
+
+ mov %al,(%edi)
+ mov %al,-1(%edi,%ecx)
+ cmp $2,%ecx
+ jbe 1f
+
+ mov %al,1(%edi)
+ mov %al,-2(%edi,%ecx)
+ cmp $4,%ecx
+ jbe 1f
+
+ mov %eax,(%edi)
+ mov %eax,-4(%edi,%ecx)
+ cmp $8,%ecx
+ jbe 1f
+
+ mov %eax,4(%edi)
+ mov %eax,-8(%edi,%ecx)
+
+1: mov 8(%esp),%eax
+ pop %edi
+ ret
diff --git a/src/string/x86_64/memset.s b/src/string/x86_64/memset.s
new file mode 100644
index 00000000..fc06eef8
--- /dev/null
+++ b/src/string/x86_64/memset.s
@@ -0,0 +1,41 @@
+.global memset
+.type memset,@function
+memset:
+ and $0xff,%esi
+ mov $0x101010101010101,%rax
+ mov %rdx,%rcx
+ mov %rdi,%r8
+ imul %rsi,%rax
+ cmp $16,%rcx
+ jb 1f
+
+ mov %rax,-8(%rdi,%rcx)
+ shr $3,%rcx
+ rep
+ stosq
+ mov %r8,%rax
+ ret
+
+1: test %ecx,%ecx
+ jz 1f
+
+ mov %al,(%rdi)
+ mov %al,-1(%rdi,%rcx)
+ cmp $2,%ecx
+ jbe 1f
+
+ mov %al,1(%rdi)
+ mov %al,-2(%rdi,%rcx)
+ cmp $4,%ecx
+ jbe 1f
+
+ mov %eax,(%rdi)
+ mov %eax,-4(%rdi,%rcx)
+ cmp $8,%ecx
+ jbe 1f
+
+ mov %eax,4(%rdi)
+ mov %eax,-8(%rdi,%rcx)
+
+1: mov %r8,%rax
+ ret