On Thursday, 30 January 2014 at 21:33:38 UTC, bearophile wrote:
If a function takes no time to run, and you tweak it, your
program is not supposed to go faster.
Right.
I was going to compare the asm listings, but C++ seems to have
unrolled and inlined the outer loop right inside main(), and
now I'm slightly lost in it :)
Try using -fkeep-inline-functions.
Thanks.
G++:
http://codepad.org/oOZQw1VQ
LDC:
http://codepad.org/5nHoZL1k
LDC basically generated something that I can only call "one
straight *whoooosh*"... This reminds me Andrei's talk on (last
years?) GoingNative ("more instructions is not always slower
code").
