https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124463
Bug ID: 124463
Summary: Big (10x) performance regression for
std::vector<unsigned char>
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: agriff at tin dot it
Target Milestone: ---
Created attachment 63907
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63907&action=edit
Program that check speed of a std::deque<unsigned char> used as a dynamically
sized ring buffer
While doing some performance check for more complex code I bumped into a big
performance regression of -O3 code with std::deque<unsigned char>
Attached code with 14.3 ~ 170 ms
Attached code with 15.1 ~ 1300 ms
same problem persists in newer versions available in godbolt
