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[3.6] bpo-31373: remove overly strict float range checks (GH-3486) (#3495)

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This undoes a853a8ba78 except for the pytime.c
parts. We want to continue to allow IEEE 754 doubles larger than FLT_MAX to be
rounded into finite floats. Tests were added to very this behavior.
(cherry picked from commit 2bb69a5b4e)
This commit is contained in:
Benjamin Peterson 2017-09-11 23:08:49 -07:00 • committed by GitHub
parent 99b941b420
commit cb356c2ecc
4 changed files with 14 additions and 6 deletions
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4
Objects/floatobject.c
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@ -2182,13 +2182,13 @@ _PyFloat_Pack4(double x, unsigned char *p, int le)
}
else {
float y = (float)x;
int i, incr = 1;
if (fabs(x) > FLT_MAX && !Py_IS_INFINITY(x))
if (Py_IS_INFINITY(y) && !Py_IS_INFINITY(x))
goto Overflow;
unsigned char s[sizeof(float)];
float y = (float)x;
memcpy(s, &y, sizeof(float));
if ((float_format == ieee_little_endian_format && !le)