https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101474
Bug ID: 101474
Summary: -fipa-icf generates worse code for identical function
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at oracle dot com
Target Milestone: ---
Created attachment 51166
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51166&action=edit
Test case
I've come across a weird behaviour when using -fipa-icf, could maybe be related
to bug 80277.
Build with -O1 -fipa-icf and the second version of the identical function
actually has worse codegen than if you have just one of them there or than if
you hadn't passed -fipa-icf at all.
See example: https://godbolt.org/z/n8zz947aK
