[m-dev.] What's the deal with integer types in Mercury's C source.

[Paul Bone]

Hi guys.

In C source we often use MR_Integer and MR_Unsigned, these are guaranteed to be
at least pointer-sized.  We also use MR_uint_least32_t and friends when we want
something at least that particular size.

I want an integer that is exactly 32 bits on 32 and 64 bit platforms.  I'm
trying to make some inline assembler things as compatible as possible with
different C compilers on i386 and x86_64.  The assembly code it's self is
compatible with either i386 or x86_64 but I'd also like it's parameter to be
exactly 32 bits to match the operand size I'm using in the assembly code.

How portable is uint32_t?  Or should I use some other type to get _exactly_ a
32bit unsigned int?

Thanks.

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