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ftoi conversion magic
Posted by cipher on Jul 25 2009 @ 04:53 :: 1149 unique visits
CODE: C
#define iman_ 0
const lreal _double2fixmagic = 68719476736.0*1.5;
const int32 _shiftamt = 16;
static inline long Real2Int(double val)
{
val = val + _double2fixmagic;
//printf(\"%lf\", val); //if we print the results, all works without any flaw
return ((int32*)&val)[iman_] >> _shiftamt;
}
//due to compiler optimizations the return fails
//warning: dereferencing type-punned pointer will break strict-aliasing rules
//how can i get this to work without turning off compiler optimizations in general?
const lreal _double2fixmagic = 68719476736.0*1.5;
const int32 _shiftamt = 16;
static inline long Real2Int(double val)
{
val = val + _double2fixmagic;
//printf(\"%lf\", val); //if we print the results, all works without any flaw
return ((int32*)&val)[iman_] >> _shiftamt;
}
//due to compiler optimizations the return fails
//warning: dereferencing type-punned pointer will break strict-aliasing rules
//how can i get this to work without turning off compiler optimizations in general?
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