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

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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
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5
LibC/string.cpp
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@@ -102,8 +102,11 @@ int memcmp(const void* v1, const void* v2, size_t n)
return 0;
}
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)
return mmx_memcpy(dest_ptr, src_ptr, n);
dword dest = (dword)dest_ptr;
dword src = (dword)src_ptr;
// FIXME: Support starting at an unaligned address.