RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 12:38:12 +00:00
Code Issues Activity Actions

Add a fast memcpy() using MMX when we're moving >= 1KB.

Browse source 
This is a nice speedup for WindowServer. I'll eventually have to do this
with SSE but the kernel doesn't support SSE yet so this is it for now.
This commit is contained in:
Andreas Kling 2019-02-07 08:46:52 +01:00
parent e29060620f
commit 1f159eaab0
6 changed files with 70 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Kernel/StdLib.cpp
View file

@ -1,12 +1,18 @@
#include "types.h"
#include "Assertions.h"
#include "kmalloc.h"
#include <AK/StdLibExtras.h>
#include <AK/Types.h>
extern "C" {
void memcpy(void *dest_ptr, const void *src_ptr, dword n)
void memcpy(void* dest_ptr, const void* src_ptr, dword n)
{
if (n >= 1024) {
mmx_memcpy(dest_ptr, src_ptr, n);
return;
}
dword dest = (dword)dest_ptr;
dword src = (dword)src_ptr;
// FIXME: Support starting at an unaligned address.