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Better precision with Clock on Win32

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This commit is contained in:
Christoffer Lerno
2024-08-08 23:03:04 +02:00
parent 07e7bc0a94
commit c8a113384c
1 changed files with 8 additions and 1 deletions
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9
lib/std/time/os/time_win32.c3
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@@ -8,16 +8,23 @@ extern fn Win32_BOOL win32_QueryPerformanceCounter(Win32_LARGE_INTEGER* lpPerfor
const ulong WINDOWS_TICK_US @local = 10;
const ulong WIN_TO_UNIX_EPOCH_US @local = 116444736000000000u64 / WINDOWS_TICK_US;
macro ulong safe_mul_div(ulong a, ulong b, ulong c)
{
return b * (a / c) + b * (a % c) / c;
}
fn Clock native_clock()
{
static Win32_LARGE_INTEGER freq;
static ulong div = 0;
ulong mult = 0;
if (!freq.quadPart)
{
if (!win32_QueryPerformanceFrequency(&freq)) return 0;
}
Win32_LARGE_INTEGER counter @noinit;
if (!win32_QueryPerformanceCounter(&counter)) return 0;
return (Clock)((counter.quadPart * 1_000_000_000) / freq.quadPart);
return (Clock)safe_mul_div(counter.quadPart, 1_000_000_000, freq.quadPart);
}
fn Time native_timestamp()