STINNER Victor <vstin...@redhat.com> added the comment:
The bug occurs when GCC emits a single instruction (stxsspx) for cast + memcpy.
I understand that the struct module is not affected because there is a
condition branch (if) between the cast ("float x = ...") and the memcpy().
static int
np_float(char *p, PyObject *v, const formatdef *f)
{
float x = (float)PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
memcpy(p, (char *)&x, sizeof x);
return 0;
}
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35752>
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