source:
EcnlProtoTool/trunk/musl-1.1.18/src/math/floorf.c@
444
Last change on this file since 444 was 444, checked in by , 4 years ago | |
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File size: 433 bytes |
Rev | Line | |
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[444] | 1 | #include "libm.h" |
2 | ||
3 | float floorf(float x) | |
4 | { | |
5 | union {float f; uint32_t i;} u = {x}; | |
6 | int e = (int)(u.i >> 23 & 0xff) - 0x7f; | |
7 | uint32_t m; | |
8 | ||
9 | if (e >= 23) | |
10 | return x; | |
11 | if (e >= 0) { | |
12 | m = 0x007fffff >> e; | |
13 | if ((u.i & m) == 0) | |
14 | return x; | |
15 | FORCE_EVAL(x + 0x1p120f); | |
16 | if (u.i >> 31) | |
17 | u.i += m; | |
18 | u.i &= ~m; | |
19 | } else { | |
20 | FORCE_EVAL(x + 0x1p120f); | |
21 | if (u.i >> 31 == 0) | |
22 | u.i = 0; | |
23 | else if (u.i << 1) | |
24 | u.f = -1.0; | |
25 | } | |
26 | return u.f; | |
27 | } |
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