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optimize ReadRegister, as localtime (at least on MSVC/Windows) is significantly showing up in profiling

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e.g. in SW Trilogy

caches localtime until time changes (i.e. limits calls to 1/sec)
This commit is contained in:
toxieainc 2022-07-11 18:47:13 +02:00
parent ba7145df52
commit b98be0c2e7
1 changed files with 9 additions and 4 deletions
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9
Src/Model3/RTC72421.cpp
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@ -33,7 +33,7 @@
#include "RTC72421.h" #include "RTC72421.h"
#include <time.h> #include <ctime>
#include "Supermodel.h" #include "Supermodel.h"
@ -43,11 +43,16 @@
UINT8 CRTC72421::ReadRegister(unsigned reg) UINT8 CRTC72421::ReadRegister(unsigned reg)
{ {
static time_t oldTime{0};
time_t currentTime; time_t currentTime;
struct tm *Time; static struct tm *Time;
time(&currentTime); time(&currentTime);
if (currentTime != oldTime)
{
Time = localtime(&currentTime); Time = localtime(&currentTime);
oldTime = currentTime;
}
switch (reg&0xF) switch (reg&0xF)
{ {