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| author | Tim Peters <tim.peters@gmail.com> | 2000-07-08 04:17:21 (GMT) |
|---|---|---|
| committer | Tim Peters <tim.peters@gmail.com> | 2000-07-08 04:17:21 (GMT) |
| commit | 7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1 (patch) | |
| tree | b2a404e6604682d51adf242e1ac51ac225e6a0bc /Objects/longobject.c | |
| parent | 5639ba4896fa7a4e29f11bf0c42f6e3125785654 (diff) | |
| download | cpython-7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1.zip cpython-7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1.tar.gz cpython-7d3a511a40a8c90eac66d3d59edbbe3c3d4559b1.tar.bz2 | |
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 'Objects/longobject.c')
| -rw-r--r-- | Objects/longobject.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/Objects/longobject.c b/Objects/longobject.c index a28dbaf..df3c6a5 100644 --- a/Objects/longobject.c +++ b/Objects/longobject.c @@ -571,7 +571,8 @@ long_format(PyObject *aa, int base, int addL) int last = abs(a->ob_size); int basebits = 1; i = base; - while ((i >>= 1) > 1) ++basebits; + while ((i >>= 1) > 1) + ++basebits; i = 0; for (;;) { @@ -853,7 +854,9 @@ x_divrem(PyLongObject *v1, PyLongObject *w1, PyLongObject **prem) carry += v->ob_digit[i+k] - z + ((twodigits)zz << SHIFT); v->ob_digit[i+k] = carry & MASK; - carry = (carry >> SHIFT) - zz; + carry = Py_ARITHMETIC_RIGHT_SHIFT(BASE_TWODIGITS_TYPE, + carry, SHIFT); + carry -= zz; } if (i+k < size_v) { @@ -870,7 +873,9 @@ x_divrem(PyLongObject *v1, PyLongObject *w1, PyLongObject **prem) for (i = 0; i < size_w && i+k < size_v; ++i) { carry += v->ob_digit[i+k] + w->ob_digit[i]; v->ob_digit[i+k] = carry & MASK; - carry >>= SHIFT; + carry = Py_ARITHMETIC_RIGHT_SHIFT( + BASE_TWODIGITS_TYPE, + carry, SHIFT); } } } /* for j, k */ @@ -988,8 +993,6 @@ x_add(PyLongObject *a, PyLongObject *b) for (i = 0; i < size_b; ++i) { carry += a->ob_digit[i] + b->ob_digit[i]; z->ob_digit[i] = carry & MASK; - /* The following assumes unsigned shifts don't - propagate the sign bit. */ carry >>= SHIFT; } for (; i < size_a; ++i) { |