Re: AW: AW: Could turn on -O2 in AIX

Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu> writes:
> Is the original issue support for 0x10... as the smallest integer, as
> opposed to -MAX_INT? As long as we continue to map the "reserved values"
> to the upper and lower range of allowed values so they are unlikely to
> appear under normal circumstances, the change should be OK.

I think that the original problem was that Andreas was seeing a compiler
codegen bug on AIX, having to do with the comparison
foo > INT_MIN
generated by the AbsoluteTimeIsReal macro. I think he was seeing that
the compiler insisted on generating an unsigned compare, explicit casts
to signed datatypes notwithstanding :-(.

The proposed fix was to recode the macro's test as foo != INT_MIN,
thereby avoiding the issue of whether the comparison is signed or not.
To do that, we needed to make NOSTART_ABSTIME be defined as INT_MIN
on all platforms, not only AIX. That seemed like a good general-purpose
approach to me anyway, since the intended meaning of 0x80000000 was very
unclear otherwise.

regards, tom lane

PS: I'm quite sure that I'd explicitly cc'd you on the prior discussion.
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