diff options
Diffstat (limited to 'src/utils/fastsqrt.h')
| -rw-r--r-- | src/utils/fastsqrt.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/utils/fastsqrt.h b/src/utils/fastsqrt.h index 8ba6f8ce..8da1d354 100644 --- a/src/utils/fastsqrt.h +++ b/src/utils/fastsqrt.h @@ -9,15 +9,16 @@ float fastInvSqrt(float x)
{
- float xhalf = 0.5f*x;
- int i = *(int*)&x;
- i = 0x5f375a86- (i>>1);
- x = *(float*)&i;
- x = x*(1.5f-xhalf*x*x);
+ union { int i; float x; } tmp;
+ float xhalf = 0.5f * x;
+ tmp.x = x;
+ tmp.i = 0x5f375a86 - (tmp.i >> 1);
+ x = tmp.x;
+ x = x * (1.5f - xhalf * x * x);
return x;
}
float fastSqrt(float x)
{
- return 1.0f/fastInvSqrt(x);
+ return 1.0f / fastInvSqrt(x);
}
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