What about when you factor in PGO? (-fprofile-generate & -fprofile-use) | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

nly on Oct 17, 2021 | parent | context | favorite | on: Bubble sort slower with -O3 than -O2 with GCC

What about when you factor in PGO? (-fprofile-generate & -fprofile-use)

mhh__ on Oct 17, 2021 | [–]

This is the rub. the compiler is flying completely blind without PGO.

I turned on PGO for the D compiler recently and it compiled it's tests 15% faster. Boom.

codr7 on Oct 17, 2021 | [–]

Haven't really been down that rabbit hole yet, thanks for reminding me.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact