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  r69436 | mark.dickinson | 2009-02-08 14:42:28 +0000 (Sun, 08 Feb 2009) | 10 lines

  Issue #789290: make sure that hash(2**63) == hash(2.**63) on 64-bit
  platforms.  The previous code was fragile, depending on the twin
  accidents that:

    (1) in C, casting the double value 2.**63 to long returns the integer
        value -2**63, and
    (2) in Python, hash(-2**63) == hash(2**63).

  There's already a test for this in test_hash.
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This commit is contained in:
Mark Dickinson 2009-02-08 15:09:21 +00:00
parent 876185542d
commit c96db47217
1 changed files with 1 additions and 1 deletions
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Objects/object.c
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@ -655,7 +655,7 @@ _Py_HashDouble(double v)
fractpart = modf(v, &intpart); fractpart = modf(v, &intpart);
if (fractpart == 0.0) { if (fractpart == 0.0) {
/* This must return the same hash as an equal int or long. */ /* This must return the same hash as an equal int or long. */
if (intpart > LONG_MAX || -intpart > LONG_MAX) { if (intpart > LONG_MAX/2 || -intpart > LONG_MAX/2) {
/* Convert to long and use its hash. */ /* Convert to long and use its hash. */
PyObject *plong; /* converted to Python long */ PyObject *plong; /* converted to Python long */
if (Py_IS_INFINITY(intpart)) if (Py_IS_INFINITY(intpart))