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Implement fast frexpf.

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This commit is contained in:
Bartosz Taudul 2018-06-06 01:53:41 +02:00
parent 26cc9d8547
commit 8696c81e7d
1 changed files with 14 additions and 1 deletions
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15
server/TracyView.cpp
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@ -153,10 +153,23 @@ static const char* RealToString( double val, bool separator )
return buf; return buf;
} }
tracy_force_inline float frexpf_fast( float f, int& power )
{
float ret;
int32_t fl;
memcpy( &fl, &f, 4 );
power = ( fl >> 23 ) & 0x000000ff;
power -= 0x7e;
fl &= 0x807fffff;
fl |= 0x3f000000;
memcpy( &ret, &fl, 4 );
return ret;
}
tracy_force_inline float log2fast( float x ) tracy_force_inline float log2fast( float x )
{ {
int e; int e;
auto f = frexpf( fabsf( x ), &e ); auto f = frexpf_fast( fabsf( x ), e );
auto t0 = 1.23149591368684f * f - 4.11852516267426f; auto t0 = 1.23149591368684f * f - 4.11852516267426f;
auto t1 = t0 * f + 6.02197014179219f; auto t1 = t0 * f + 6.02197014179219f;
auto t2 = t1 * f - 3.13396450166353f; auto t2 = t1 * f - 3.13396450166353f;