Loose type-checking and C-style casts are gifts from the gods.

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While Uli's information about the preprocessor was fascinating,
I disagree with his latter comment,
loose type-checking and C-style casts are gifts from the gods.

For example:
#pragma warning( disable: \
4007 4101 4189 4244 4305 4430 4508 4706 4709 4996 )

#define Tics ( QueryPerformanceCounter( & _Tics ), _Tics )

#define Secs ( _Secs = Tics / Secnd_Dub )

__int64 _Tics, Secnd ; double _Secs, Secnd_Dub ;

extern "C" int __stdcall QueryPerformanceCounter( __int64 * );
extern "C" int __stdcall QueryPerformanceFrequency( __int64 * );

typedef unsigned __int32 UInt32_Type ;
typedef UInt32_Type * pUInt32_Type ;

typedef unsigned __int8 UInt8_Type ;
typedef UInt8_Type * pUInt8_Type ;

WinMain( int, int, int, int ) {
int rv = 6 ;
rv ++ ;
QueryPerformanceFrequency( & Secnd ), Secnd_Dub = Secnd ;
double Start = Secs ;

// Timing int-by-int access.
static UInt32_Type B[ 999999 ];
pUInt32_Type P = B - 1, E = B + 999999 ;

while ( ++ P < E ) * P ++ ;
float Waited_32 = Secs - Start ; Start = Secs ;

// Timing byte-by-byte access.
{ pUInt8_Type
P = pUInt8_Type( B ) - 1
, E = pUInt8_Type( B + 999999 ) ;

while ( ++ P < E ) * P ++ ;
float
Waited_8 = Secs - Start
, TimesSlower = Waited_8 / Waited_32 ;

// Breaking here,
// the debugger says: “ Waited_32 == .0029 ” seconds.

// “ Waited_8 == .0113 ” seconds.
// And “ TimesSlower == 3.96 ” times slower.
TimesSlower = TimesSlower ; } }


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Relevant Pages

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