On Tuesday, 6 September 2016 at 14:26:22 UTC, finalpatch wrote:
On Tuesday, 6 September 2016 at 14:21:01 UTC, finalpatch wrote:
Then some template magic will figure out the LCM of the 2
kernels' pixel width is 3*4=12 and therefore they are fused
together into a composite kernel of pixel width 12. The above
line compiles down into a single function invokation, with a
main loop that reads the source buffer in 4 pixels step, call
MySimpleKernel 3 times, then call AnotherKernel 4 times.
Correction:
with a main loop that reads the source buffer in *12* pixels
step, call MySimpleKernel 3 times, then call AnotherKernel 4
times.
And of course the key to the speed is all function calls get
inlined by the compiler.
