Re: 64 bit integers ?

jamey@juicy-juice.lcs.mit.edu
Tue, 9 Mar 1993 16:52:22 GMT

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64 bit integers ? larsn@autodesk.com (1993-03-04)
Re: 64 bit integers ? jamey@juicy-juice.lcs.mit.edu (1993-03-09)
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Newsgroups: comp.compilers
From: jamey@juicy-juice.lcs.mit.edu
Keywords: C, architecture
Organization: Compilers Central
References: 93-03-018
Date: Tue, 9 Mar 1993 16:52:22 GMT

In order to write portable and efficient code, don't use 'int', because
'int' is not portable if you care about its size.


Instead of int, we use
uint32_t, for unsigned 32 bit integers
sint32_t, for signed 32 bit integers
auint32_t, for an unsigned integer of at least 32 bits,
asint32_t, for a signed integer of at least 32 bits,
uint8_t
sint8_t
etc.


These types can all be defined in a single .h file that is conditionalized
for each architecture. The auint32_t type can be implemented as 32 or 64
bits depending on which is more efficient. Type uint32_t should be used
when it is necessary to use 32-bits even if 64 would be more efficient (if
that is ever the case).


-Jamey
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  Dr. James Hicks jamey@mcrc.mot.com
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