Re: 64Bit ints

[Christian Reiniger <warewolf@mayn.de>]

Sam Lantinga wrote:

>> I experimented a bit with "long long" variables, and they apparently behave
>> just like a nice 64bit int should behave. Arithmetic operations work,

>Play on different systems, and different OS's. :)

Ok, Sorry for being so imprecise. That was mainly a sort of internal note
for the "knowing ones" ;)
So here's some more context:

In out main header file wa have some custom type declarations, including
these:

----8<--------8<-------
[...]

/***
  Do 64 bit integers exist?
  Thanks Yong Chi for the hack for detecting
  64 bit architectures.
***/

#if INT_MAX < LONG_MAX
  #define _PP_64BIT_ARCH
  #define _PP_64BIT_INTS
#elif defined (__GNUC__)
  #define _PP_64BIT_INTS
#endif

[...]

/***
  Integers with guaranteed _minimum_ size.
  These could be larger than you expect,
  they are designed for speed.
***/
typedef          long int      ppInt32;
typedef          long int      ppInt16;
typedef          long int      ppInt8;
typedef unsigned long int      ppuInt32;
typedef unsigned long int      ppuInt16;
typedef unsigned long int      ppuInt8;

/*64 bits ints might exist.  Preferably becuase this is a 64
  bit architecture, but we will use the GCC long long type if we
  have to.
*/
#ifdef _PP_64BIT_INTS
#ifdef _PP_64BIT_ARCH
  typedef              long ppInt64;
  typedef  unsigned    long ppuInt64;
#elif defined(__GNUC__)
  typedef           long long ppInt64;
  typedef  unsigned long long ppuInt64;
#endif
#endif


/***
  Integers with guaranteed _exact_ size.
***/
typedef          int      pp32;
typedef          short    pp16;
typedef signed   char     pp8;
typedef unsigned int      ppu32;
typedef unsigned short    ppu16;
typedef unsigned char     ppu8;
#ifdef _PP_64BIT_INTS
#ifdef _PP_64BIT_ARCH
  typedef              long pp64;
  typedef  unsigned    long ppu64;
#elif __GNUC__
  typedef          long long pp64;
  typedef unsigned long long ppu64;
#else
#  define PP_NO_64BIT_INTEGERS
#endif
#endif

[...]

-------8<--------8<---------

I.e. long longs are used as 64bit ints only on non-native 64Bit systems
with gcc/g++
And *that* should be pretty safe ;)

But I'm always grateful for more tips on handling this.


Cu
	Christian
--

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