https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91509
Bug ID: 91509
Summary: -fprefetch-loop-arrays and LTO causes memory usage
compiling wrf to go through the roof
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Our daily SPEC 2006 tester on a bdver2 machine (thus, -fprefetch-loop-arrays is
on by default) runs into its 4GB virtual memory usage limit since r271377
when compiling with -Ofast -flto -march=native (where native is bdver2).
Memory use peaks at about 5.5GB where 4GB is reachend when first computing
DF live after RTL loop opts and the peak is during scheduling. There are
a lot of pseudos around (~260000) during DF live compute.
