source:
asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/math/sinhf.c@
380
Last change on this file since 380 was 352, checked in by , 6 years ago | |
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File size: 488 bytes |
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1 | #include "libm.h" |
2 | |
3 | float sinhf(float x) |
4 | { |
5 | union {float f; uint32_t i;} u = {.f = x}; |
6 | uint32_t w; |
7 | float t, h, absx; |
8 | |
9 | h = 0.5; |
10 | if (u.i >> 31) |
11 | h = -h; |
12 | /* |x| */ |
13 | u.i &= 0x7fffffff; |
14 | absx = u.f; |
15 | w = u.i; |
16 | |
17 | /* |x| < log(FLT_MAX) */ |
18 | if (w < 0x42b17217) { |
19 | t = expm1f(absx); |
20 | if (w < 0x3f800000) { |
21 | if (w < 0x3f800000 - (12<<23)) |
22 | return x; |
23 | return h*(2*t - t*t/(t+1)); |
24 | } |
25 | return h*(t + t/(t+1)); |
26 | } |
27 | |
28 | /* |x| > logf(FLT_MAX) or nan */ |
29 | t = 2*h*__expo2f(absx); |
30 | return t; |
31 | } |
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