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AK: Fix bug in MMX memcpy() unaligned prologue handling.

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This commit is contained in:
Andreas Kling 2019-02-12 12:39:04 +01:00
parent 7ce15f1c54
commit 27df572381
Notes: sideshowbarker 2024-07-19 15:46:24 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/27df572381d
1 changed files with 3 additions and 2 deletions
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5
AK/StdLibExtras.cpp
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@ -12,12 +12,13 @@ void* mmx_memcpy(void* dest, const void* src, size_t len)
if ((dword)dest_ptr & 7) {
dword prologue = 8 - ((dword)dest_ptr & 7);
len -= prologue;
asm volatile(
"rep movsb\n"
:: "S"(src_ptr), "D"(dest_ptr), "c"(prologue)
: "=S"(src_ptr), "=D"(dest_ptr), "=c"(prologue)
: "0"(src_ptr), "1"(dest_ptr), "2"(prologue)
: "memory"
);
len -= prologue;
}
for (dword i = len / 64; i; --i) {
asm volatile(