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Cray J90 fixes for long ints.

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This was a convenient excuse to create the pyport.h file recently
discussed!
Please use new Py_ARITHMETIC_RIGHT_SHIFT when right-shifting a
signed int and you *need* sign-extension.  This is #define'd in
pyport.h, keying off new config symbol SIGNED_RIGHT_SHIFT_ZERO_FILLS.
If you're running on a platform that needs that symbol #define'd,
the std tests never would have worked for you (in particular,
at least test_long would have failed).
The autoconfig stuff got added to Python after my Unix days, so
I don't know how that works.  Would someone please look into doing
& testing an auto-config of the SIGNED_RIGHT_SHIFT_ZERO_FILLS
symbol?  It needs to be defined if & only if, e.g., (-1) >> 3 is
not -1.
This commit is contained in:
Tim Peters 2000-07-08 04:17:21 +00:00
parent 5639ba4896
commit 7d3a511a40
6 changed files with 76 additions and 12 deletions
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5
Objects/intobject.c
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@ -721,10 +721,7 @@ int_rshift(v, w)
a = 0;
}
else {
if (a < 0)
a = ~( ~(unsigned long)a >> b );
else
a = (unsigned long)a >> b;
a = Py_ARITHMETIC_RIGHT_SHIFT(long, a, b);
}
return PyInt_FromLong(a);
}