https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108470
Bug ID: 108470
Summary: Missing documentation for alternate uses of
__attribute__((noinline))
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: rth at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
The noinline attribute affects decisions made by ipa-split.cc
and ipa-icf.cc that are not immediately obvious.
At least the ipa-split choice affects code correctness for QEMU
(in that we expect __builtin_return_address to be used in very
specific contexts, and the transformation done by ipa-split
invalidates that). Using noinline on the affected functions
prevents the ipa-split optimization and restores functionality.
It would be nice to document the effect, so that the workaround
is not affected in future gcc versions.
