http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57218
Bug #: 57218
Summary: Excessive inlining even at -Os
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: amyl...@gcc.gnu.org
Created attachment 30062
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30062
test case (excerpt from newlib/libc/stdio/findfp.c)
In the testcase, std is inlined (thrice) into __sinit at the tree level,
even at -Os, thus increasing code size.
I first noticed this as a regression for arc-elf32 going from 4.4 to 4.8.
It used to be only inlined at -O3, not at -Os or -O2.
I have since verified that it is also not inlined at -Os / -O2
for i686-pc-linux-gnu 4.7.2 20120921 (Red Hat 4.7.2-2),
but it is inlined for i686-pc-linux-gnu GCC 4.8.0 and
4.9.0 20130422 (experimental)
Going from 4.7.2 to 4.9.0 (experimental), that causes a size regression
of 34.5% on i686-pc-linux-gnu at -Os.
