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-rw-r--r--src/string/i386/memset.s47
1 files changed, 47 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