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special-case more accurate answer for exp(1.0)

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Jeff Bezanson 2013-12-12 16:42:05 -05:00
parent 9b23967282
commit 9bc257a323
1 changed files with 5 additions and 0 deletions
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5
src/e_exp.c
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@ -125,6 +125,11 @@ __ieee754_exp(double x) /* default IEEE double exp */
if(x < u_threshold) return twom1000*twom1000; /* underflow */
}
/* by pure bad luck, this implementation's error for x==1.0 is
unusually large, although still within 1 ulp. */
if (x == 1.0)
return 2.718281828459045235360;
/* argument reduction */
if(hx > 0x3fd62e42) { /* if |x| > 0.5 ln2 */
if(hx < 0x3FF0A2B2) { /* and |x| < 1.5 ln2 */