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| author | Tim Peters <tim.peters@gmail.com> | 2000-07-08 04:17:21 +0000 |
|---|---|---|
| committer | Tim Peters <tim.peters@gmail.com> | 2000-07-08 04:17:21 +0000 |
| commit | 7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1 (patch) | |
| tree | b2a404e6604682d51adf242e1ac51ac225e6a0bc /Include/longintrepr.h | |
| parent | 5639ba4896fa7a4e29f11bf0c42f6e3125785654 (diff) | |
| download | cpython-git-7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1.tar.gz | |
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.
Diffstat (limited to 'Include/longintrepr.h')
| -rw-r--r-- | Include/longintrepr.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Include/longintrepr.h b/Include/longintrepr.h index 4ddbd06e59..fed01ed8b1 100644 --- a/Include/longintrepr.h +++ b/Include/longintrepr.h @@ -18,7 +18,7 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. /* Parameters of the long integer representation. These shouldn't have to be changed as C should guarantee that a short - contains at least 16 bits, but it's made changeable any way. + contains at least 16 bits, but it's made changeable anyway. Note: 'digit' should be able to hold 2*MASK+1, and 'twodigits' should be able to hold the intermediate results in 'mul' (at most MASK << SHIFT). @@ -28,8 +28,9 @@ redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. typedef unsigned short digit; typedef unsigned int wdigit; /* digit widened to parameter size */ -typedef unsigned long twodigits; -typedef long stwodigits; /* signed variant of twodigits */ +#define BASE_TWODIGITS_TYPE long +typedef unsigned BASE_TWODIGITS_TYPE twodigits; +typedef BASE_TWODIGITS_TYPE stwodigits; /* signed variant of twodigits */ #define SHIFT 15 #define BASE ((digit)1 << SHIFT) |