undefined | Better HN

0 pointssaagarjha6y ago0 comments

How much C have you written, and how much has gone through a high-performance optimizing compiler?

0 comments

I don't know. Quite a bit - maybe written 300K lines and deleted > 200K lines. Most of it was compiled by gcc -O2 and/or MSVC. I've never relied on vectorization or used a lot of intrinsics, though.

saagarjhaOP6y ago

I'm honestly quite surprised you've never run into surprising behavior caused by the optimizer handling undefined behavior…

jstimpfle6y ago

Not that I'm aware of it.

j / k navigate · click thread line to collapse

0 pointssaagarjha6y ago0 comments

How much C have you written, and how much has gone through a high-performance optimizing compiler?

0 comments

jstimpfle6y ago

I don't know. Quite a bit - maybe written 300K lines and deleted > 200K lines. Most of it was compiled by gcc -O2 and/or MSVC. I've never relied on vectorization or used a lot of intrinsics, though.

saagarjhaOP6y ago

I'm honestly quite surprised you've never run into surprising behavior caused by the optimizer handling undefined behavior…

jstimpfle6y ago

Not that I'm aware of it.

j / k navigate · click thread line to collapse