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[3.6] fixes bpo-31373: fix undefined floating-point demotions (GH-3396) (#3424)

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(cherry picked from commit a853a8ba78)
This commit is contained in:
Miss Islington (bot) 2017-09-07 11:35:03 -07:00 • committed by Benjamin Peterson
parent b0d0217c0e
commit b03623227e
5 changed files with 51 additions and 30 deletions
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10
Objects/floatobject.c
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@ -2182,13 +2182,15 @@ _PyFloat_Pack4(double x, unsigned char *p, int le)
}
else {
float y = (float)x;
const unsigned char *s = (unsigned char*)&y;
int i, incr = 1;
if (Py_IS_INFINITY(y) && !Py_IS_INFINITY(x))
if (fabs(x) > FLT_MAX && !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)
|| (float_format == ieee_big_endian_format && le)) {
p += 3;
@ -2196,7 +2198,7 @@ _PyFloat_Pack4(double x, unsigned char *p, int le)
}
for (i = 0; i < 4; i++) {
*p = *s++;
*p = s[i];
p += incr;
}
return 0;