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libm: use union for infinity

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Anonymous Maarten
2023-08-27 23:52:47 +02:00
committed by Anonymous Maarten
parent 474c8d0073
commit a84389f6bb
1 changed files with 9 additions and 0 deletions
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9
src/libm/e_exp.c
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@@ -98,6 +98,13 @@ P3 = 6.61375632143793436117e-05, /* 0x3F11566A, 0xAF25DE2C */
P4 = -1.65339022054652515390e-06, /* 0xBEBBBD41, 0xC5D26BF1 */
P5 = 4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */
union {
Uint64 u64;
double d;
} inf_union = {
0x7ff0000000000000 /* Binary representation of a 64-bit infinite double (sign=0, exponent=2047, mantissa=0) */
};
double __ieee754_exp(double x) /* default IEEE double exp */
{
double y;
@@ -123,6 +130,8 @@ double __ieee754_exp(double x) /* default IEEE double exp */
else return (xsb==0)? x:0.0; /* exp(+-inf)={inf,0} */
}
#if 1
if(x > o_threshold) return inf_union.d; /* overflow */
#elif 1
if(x > o_threshold) return huge*huge; /* overflow */
#else /* !!! FIXME: check this: "huge * huge" is a compiler warning, maybe they wanted +Inf? */
if(x > o_threshold) return INFINITY; /* overflow */