1 | #include "SDL_internal.h" |
---|---|
2 | /* |
3 | * Written by J.T. Conklin <jtc@netbsd.org>. |
4 | * Public domain. |
5 | */ |
6 | |
7 | /* |
8 | * isinff(x) returns 1 if x is inf, -1 if x is -inf, else 0; |
9 | * no branching! |
10 | */ |
11 | |
12 | #include "math.h" |
13 | #include "math_private.h" |
14 | |
15 | int __isinff (float x) |
16 | { |
17 | int32_t ix,t; |
18 | GET_FLOAT_WORD(ix,x); |
19 | t = ix & 0x7fffffff; |
20 | t ^= 0x7f800000; |
21 | t |= -t; |
22 | return ~(t >> 31) & (ix >> 30); |
23 | } |
24 | libm_hidden_def(__isinff) |
25 |