linux

Current License: CC BY-SA 4.0

14 events

when toggle format	what		by	license	comment
Mar 17 at 16:49	comment	added	user1018684		good link, just learning, trying to do it meaningful, speed is not my first target, but with timing at hand it's a meaningful tool to see if functions have some exotics ... and boiling down produces knowledge.
Mar 17 at 13:41	comment	added	chux		@user1018684 Be careful in using your valuable time.
Mar 17 at 12:01	comment	added	user1018684		in further investigation I found that accumulate in uint128 is to prefer over using negative, uint128 division by 10 has ~3 over 2 better performance than int128 / 10. Both fast ( AVX ), but significant difference. Assume reg. need to preserve the sign bit for ints, where uints can work with shifts of the complete bitfield. Evtl. similar but less significant for long and ints.
Feb 1 at 14:45	history	edited	chux	CC BY-SA 4.0	edited body
Feb 1 at 6:15	comment	added	chux		@user1018684 An alternative to accumulating the value on the negative side of is to use `uint128_t` - if available. In general I prefer to not introduce more types in a solution unless needed.
Feb 1 at 3:23	comment	added	user1018684		whow, thank you!, it'll take a while to work through this but definitely help in getting better.
Jan 31 at 22:56	history	edited	chux	CC BY-SA 4.0	added 196 characters in body
Jan 31 at 22:49	history	edited	chux	CC BY-SA 4.0	added 196 characters in body
Jan 31 at 22:38	history	edited	chux	CC BY-SA 4.0	added 196 characters in body
Jan 31 at 22:26	history	edited	chux	CC BY-SA 4.0	added 184 characters in body
Jan 31 at 22:07	history	edited	chux	CC BY-SA 4.0	added 478 characters in body
Jan 31 at 22:00	history	edited	chux	CC BY-SA 4.0	added 478 characters in body
Jan 31 at 21:46	history	edited	chux	CC BY-SA 4.0	added 15 characters in body
Jan 31 at 21:43	history	answered	chux	CC BY-SA 4.0