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Side by Side Diff: fusl/src/math/scalbn.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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1 #include <math.h>
2 #include <stdint.h>
3
4 double scalbn(double x, int n)
5 {
6 union {double f; uint64_t i;} u;
7 double_t y = x;
8
9 if (n > 1023) {
10 y *= 0x1p1023;
11 n -= 1023;
12 if (n > 1023) {
13 y *= 0x1p1023;
14 n -= 1023;
15 if (n > 1023)
16 n = 1023;
17 }
18 } else if (n < -1022) {
19 y *= 0x1p-1022;
20 n += 1022;
21 if (n < -1022) {
22 y *= 0x1p-1022;
23 n += 1022;
24 if (n < -1022)
25 n = -1022;
26 }
27 }
28 u.i = (uint64_t)(0x3ff+n)<<52;
29 x = y * u.f;
30 return x;
31 }
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