http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56244
Bug #: 56244
Summary: -O3 should imply -funroll-loops
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
AssignedTo: [email protected]
ReportedBy: [email protected]
As suggested by Richard, -O3 should imply -funroll-loops
http://gcc.gnu.org/ml/gcc/2013-02/msg00073.html
I think this makes a lot of sense. For our simulation codes, we essentially add
it 'by default' yielding small but measurable speedups (1%?).
Having it on by default (like vectorization), will likely improve the
heuristics, and the interaction with e.g. vectorization will improve.
