On 08/06/2009 09:00 PM, Nicolas Robidoux wrote: > Is the use of such tricks discouraged for GEGL (because gfloats could > be doubles at some point?) > > We can take the absolute value by setting the sign bit to zero: > // Example 13.24 > float f; > *(int*)&f&= 0x7FFFFFFF; // set sign bit to zero > > (From http://www.agner.org/optimize/optimizing_cpp.pdf)
It was an interesting paper, but I doubt that the gained speed in execution performance outweights the messier code. Plus, his example was to set the sign bit, i.e. x = -abs(x). Maybe x = abs(x) is equal to the above for optimizing compilers / Martin -- My GIMP Blog: http://www.chromecode.com/ _______________________________________________ Gegl-developer mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gegl-developer
