Memchecks: Avoid taking the mutex lock if no memchecks active. Possib…

…le minor speedup in GoW and other block-copy-heavy games.

Core/Debugger/Breakpoints.cpp

@@ -16,6 +16,7 @@
 // https:/hrydgard/ppsspp and http://www.ppsspp.org/.
 
 #include <cstdio>
+#include <atomic>
 #include <mutex>
 
 #include "Common/Log.h"
@@ -28,6 +29,8 @@
 #include "Core/MIPS/JitCommon/JitCommon.h"
 #include "Core/CoreTiming.h"
 
+std::atomic<bool> anyMemChecks_ = false;
+
 static std::mutex breakPointsMutex_;
 std::vector<BreakPoint> CBreakPoints::breakPoints_;
 u32 CBreakPoints::breakSkipFirstAt_ = 0;
@@ -388,13 +391,15 @@ void CBreakPoints::AddMemCheck(u32 start, u32 end, MemCheckCondition cond, Break
  check.result = result;
 
  memChecks_.push_back(check);
+ anyMemChecks_ = true;
  guard.unlock();
  Update();
  }
  else
  {
  memChecks_[mc].cond = (MemCheckCondition)(memChecks_[mc].cond | cond);
  memChecks_[mc].result = (BreakAction)(memChecks_[mc].result | result);
+ anyMemChecks_ = true;
  guard.unlock();
  Update();
  }
@@ -410,6 +415,7 @@ void CBreakPoints::RemoveMemCheck(u32 start, u32 end)
  if (mc != INVALID_MEMCHECK)
  {
  memChecks_.erase(memChecks_.begin() + mc);
+ anyMemChecks_ = !memChecks_.empty();
  guard.unlock();
  Update();
  }
@@ -499,6 +505,8 @@ MemCheck *CBreakPoints::GetMemCheckLocked(u32 address, int size) {
 
 BreakAction CBreakPoints::ExecMemCheck(u32 address, bool write, int size, u32 pc)
 {
+ if (!anyMemChecks_)
+ return BREAK_ACTION_IGNORE;
  std::unique_lock<std::mutex> guard(memCheckMutex_);
  auto check = GetMemCheckLocked(address, size);
  if (check) {