mirror of https://github.com/PCSX2/pcsx2.git
74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
|
/* PCSX2 - PS2 Emulator for PCs
|
||
|
|
* Copyright (C) 2021 PCSX2 Dev Team
|
||
|
|
*
|
||
|
|
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
|
||
|
|
* of the GNU Lesser General Public License as published by the Free Software Found-
|
||
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
||
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
||
|
|
* PURPOSE. See the GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License along with PCSX2.
|
||
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "General.h"
|
||
|
|
|
||
|
|
static u32 PAUSE_TIME = 0;
|
||
|
|
|
||
|
|
static void MultiPause()
|
||
|
|
{
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
_mm_pause();
|
||
|
|
}
|
||
|
|
|
||
|
|
__noinline static void UpdatePauseTime()
|
||
|
|
{
|
||
|
|
u64 start = GetCPUTicks();
|
||
|
|
for (int i = 0; i < 64; i++)
|
||
|
|
{
|
||
|
|
MultiPause();
|
||
|
|
}
|
||
|
|
u64 time = GetCPUTicks() - start;
|
||
|
|
u64 nanos = (time * 1000000000) / GetTickFrequency();
|
||
|
|
PAUSE_TIME = (nanos / 64) + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
u32 ShortSpin()
|
||
|
|
{
|
||
|
|
u32 inc = PAUSE_TIME;
|
||
|
|
if (unlikely(inc == 0))
|
||
|
|
{
|
||
|
|
UpdatePauseTime();
|
||
|
|
inc = PAUSE_TIME;
|
||
|
|
}
|
||
|
|
|
||
|
|
u32 time = 0;
|
||
|
|
// Sleep for approximately 500ns
|
||
|
|
for (; time < 500; time += inc)
|
||
|
|
MultiPause();
|
||
|
|
|
||
|
|
return time;
|
||
|
|
}
|
||
|
|
|
||
|
|
static u32 GetSpinTime()
|
||
|
|
{
|
||
|
|
if (char* req = getenv("WAIT_SPIN_MICROSECONDS"))
|
||
|
|
{
|
||
|
|
return 1000 * atoi(req);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return 50 * 1000; // 50µs
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const u32 SPIN_TIME_NS = GetSpinTime();
|