https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121692
Bug ID: 121692
Summary: Inlining fails with builtin_constant_p
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: jchrist at linux dot ibm.com
Target Milestone: ---
Created attachment 62216
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62216&action=edit
Reproducer
When a function splits control flow based on __builtin_constant_p of an
argument, inlining heuristic does not properly track size of the resulting
function. This leads to missed inlining opertunities.
Attached reproducer is an excerpt from building the Linux kernel on s390x.
Here, function __flogr should be inlined into all call sites, but is not due to
a large block of code in the __builtin_constant_p case.
