WIP: Restructuring project

base/dependencies/timing.cpp

@@ -0,0 +1,167 @@
+#ifdef GEN_INTELLISENSE_DIRECTIVES
+#	pragma once
+#	include "filesystem.cpp"
+#endif
+
+#pragma region Timing
+
+#ifdef GEN_BENCHMARK
+	#if defined( GEN_COMPILER_MSVC ) && ! defined( __clang__ )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		return __rdtsc();
+	}
+	#elif defined( __i386__ )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		u64 x;
+		__asm__ volatile( ".byte 0x0f, 0x31" : "=A"( x ) );
+		return x;
+	}
+	#elif defined( __x86_64__ )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		u32 hi, lo;
+		__asm__ __volatile__( "rdtsc" : "=a"( lo ), "=d"( hi ) );
+		return scast( u64, lo ) | ( scast( u64, hi ) << 32 );
+	}
+	#elif defined( __powerpc__ )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		u64 result = 0;
+		u32 upper, lower, tmp;
+		__asm__ volatile(
+			"0:                   \n"
+			"\tmftbu   %0         \n"
+			"\tmftb    %1         \n"
+			"\tmftbu   %2         \n"
+			"\tcmpw    %2,%0      \n"
+			"\tbne     0b         \n"
+			: "=r"( upper ), "=r"( lower ), "=r"( tmp )
+		);
+		result = upper;
+		result = result << 32;
+		result = result | lower;
+
+		return result;
+	}
+	#elif defined( GEN_SYSTEM_EMSCRIPTEN )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		return ( u64 )( emscripten_get_now() * 1e+6 );
+	}
+	#elif defined( GEN_CPU_ARM ) && ! defined( GEN_COMPILER_TINYC )
+	u64 read_cpu_time_stamp_counter( void )
+	{
+	#	if defined( __aarch64__ )
+		int64_t r = 0;
+		asm volatile( "mrs %0, cntvct_el0" : "=r"( r ) );
+	#	elif ( __ARM_ARCH >= 6 )
+		uint32_t r = 0;
+		uint32_t pmccntr;
+		uint32_t pmuseren;
+		uint32_t pmcntenset;
+
+		// Read the user mode perf monitor counter access permissions.
+		asm volatile( "mrc p15, 0, %0, c9, c14, 0" : "=r"( pmuseren ) );
+		if ( pmuseren & 1 )
+		{    // Allows reading perfmon counters for user mode code.
+			asm volatile( "mrc p15, 0, %0, c9, c12, 1" : "=r"( pmcntenset ) );
+			if ( pmcntenset & 0x80000000ul )
+			{    // Is it counting?
+				asm volatile( "mrc p15, 0, %0, c9, c13, 0" : "=r"( pmccntr ) );
+				// The counter is set up to count every 64th cycle
+				return ( ( int64_t )pmccntr ) * 64;    // Should optimize to << 6
+			}
+		}
+	#	else
+	#		error "No suitable method for read_cpu_time_stamp_counter for this cpu type"
+	#	endif
+
+		return r;
+	}
+	#else
+	u64 read_cpu_time_stamp_counter( void )
+	{
+		GEN_PANIC( "read_cpu_time_stamp_counter is not supported on this particular setup" );
+		return -0;
+	}
+	#endif
+
+	#if defined( GEN_SYSTEM_WINDOWS ) || defined( GEN_SYSTEM_CYGWIN )
+
+	u64 time_rel_ms( void )
+	{
+		local_persist LARGE_INTEGER win32_perf_count_freq = {};
+		u64                         result;
+		LARGE_INTEGER               counter;
+		local_persist LARGE_INTEGER win32_perf_counter = {};
+		if ( ! win32_perf_count_freq.QuadPart )
+		{
+			QueryPerformanceFrequency( &win32_perf_count_freq );
+			GEN_ASSERT( win32_perf_count_freq.QuadPart != 0 );
+			QueryPerformanceCounter( &win32_perf_counter );
+		}
+
+		QueryPerformanceCounter( &counter );
+
+		result = ( counter.QuadPart - win32_perf_counter.QuadPart ) * 1000 / ( win32_perf_count_freq.QuadPart );
+		return result;
+	}
+
+	#else
+
+	#	if defined( GEN_SYSTEM_LINUX ) || defined( GEN_SYSTEM_FREEBSD ) || defined( GEN_SYSTEM_OPENBSD ) || defined( GEN_SYSTEM_EMSCRIPTEN )
+	u64 _unix_gettime( void )
+	{
+		struct timespec t;
+		u64             result;
+
+		clock_gettime( 1 /*CLOCK_MONOTONIC*/, &t );
+		result = 1000 * t.tv_sec + 1.0e-6 * t.tv_nsec;
+		return result;
+	}
+	#	endif
+
+	u64 time_rel_ms( void )
+	{
+	#	if defined( GEN_SYSTEM_OSX )
+		u64 result;
+
+		local_persist u64 timebase  = 0;
+		local_persist u64 timestart = 0;
+
+		if ( ! timestart )
+		{
+			mach_timebase_info_data_t tb = { 0 };
+			mach_timebase_info( &tb );
+			timebase   = tb.numer;
+			timebase  /= tb.denom;
+			timestart  = mach_absolute_time();
+		}
+
+		// NOTE: mach_absolute_time() returns things in nanoseconds
+		result = 1.0e-6 * ( mach_absolute_time() - timestart ) * timebase;
+		return result;
+	#	else
+		local_persist u64 unix_timestart = 0.0;
+
+		if ( ! unix_timestart )
+		{
+			unix_timestart = _unix_gettime();
+		}
+
+		u64 now = _unix_gettime();
+
+		return ( now - unix_timestart );
+	#	endif
+	}
+	#endif
+
+	f64 time_rel( void )
+	{
+		return ( f64 )( time_rel_ms() * 1e-3 );
+	}
+#endif
+
+#pragma endregion Timing