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