mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 10:27:35 +00:00
LibC: Implement memcpy and memset for x86_64
This commit is contained in:
parent
2a78bf8596
commit
086b7a4537
1 changed files with 8 additions and 19 deletions
|
@ -111,7 +111,6 @@ int memcmp(const void* v1, const void* v2, size_t n)
|
|||
return 0;
|
||||
}
|
||||
|
||||
#if ARCH(I386)
|
||||
void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
|
||||
{
|
||||
void* original_dest = dest_ptr;
|
||||
|
@ -128,11 +127,19 @@ void* memset(void* dest_ptr, int c, size_t n)
|
|||
if (!(dest & 0x3) && n >= 12) {
|
||||
size_t size_ts = n / sizeof(size_t);
|
||||
size_t expanded_c = explode_byte((u8)c);
|
||||
#if ARCH(I386)
|
||||
asm volatile(
|
||||
"rep stosl\n"
|
||||
: "=D"(dest)
|
||||
: "D"(dest), "c"(size_ts), "a"(expanded_c)
|
||||
: "memory");
|
||||
#else
|
||||
asm volatile(
|
||||
"rep stosq\n"
|
||||
: "=D"(dest)
|
||||
: "D"(dest), "c"(size_ts), "a"(expanded_c)
|
||||
: "memory");
|
||||
#endif
|
||||
n -= size_ts * sizeof(size_t);
|
||||
if (n == 0)
|
||||
return dest_ptr;
|
||||
|
@ -144,24 +151,6 @@ void* memset(void* dest_ptr, int c, size_t n)
|
|||
: "memory");
|
||||
return dest_ptr;
|
||||
}
|
||||
#else
|
||||
void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
|
||||
{
|
||||
auto* dest = (u8*)dest_ptr;
|
||||
auto* src = (const u8*)src_ptr;
|
||||
for (size_t i = 0; i < n; ++i)
|
||||
dest[i] = src[i];
|
||||
return dest_ptr;
|
||||
}
|
||||
|
||||
void* memset(void* dest_ptr, int c, size_t n)
|
||||
{
|
||||
auto* dest = (u8*)dest_ptr;
|
||||
for (size_t i = 0; i < n; ++i)
|
||||
dest[i] = (u8)c;
|
||||
return dest_ptr;
|
||||
}
|
||||
#endif
|
||||
|
||||
void* memmove(void* dest, const void* src, size_t n)
|
||||
{
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue