Cray J90 fixes for long ints.

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.

1 files changed, 1 insertions, 4 deletions

diff --git a/Objects/intobject.c b/Objects/intobject.c
index ba3dde1..a5dc134 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -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);
 }