x86-64 support for gas part I

[Alan Modra]

On Wed, 20 Dec 2000, Geoff Keating wrote:

> In both old K&R compilers, and ISO C compilers, on machines with
> 32-bit ints, 0xffffffff and 0x80000000 are of type 'unsigned int'.

I thought the rule for K&R hexadecimal constants was that they are of type
'int' unless they have an 'L' suffix, in which case they are of type
'long int'.  'unsigned int' doesn't get a mention, which is precisely why
there can be a problem.  Under K&R, the above are signed constants, and
will be sign extended when stored into a 64-bit integral type, assuming
the compiler provides such a type.

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