SpectrePatch Source - Ryley Angus

// Copyright Ryley Angus, 2018
#include <substrate.h>
const double resolutionMilliSeconds = 0.1;

#ifdef  __LP64__
static double (*old_now)();

double new_now() {
    double orig = old_now();
    return (floor(orig / resolutionMilliSeconds) * resolutionMilliSeconds);
}

#else

static double (*old_other)(void* arg0);

double new_other(void* arg0) {
    double temp = old_other(arg0);
    return (floor(temp / resolutionMilliSeconds) * resolutionMilliSeconds);
}
#endif

__attribute__((constructor)) static void initialize() {
    #ifdef __LP64__
        MSHookFunction("__ZNK7WebCore11Performance3nowEv", new_now, &old_now);
    #else
        MSHookFunction("__ZN7WebCore33jsPerformancePrototypeFunctionNowEPN3JSC9ExecStateE", new_other, &old_other);
    #endif
}