https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326
--- Comment #61 from Richard Biener <rguenth at gcc dot gnu.org> --- r12-7592, first testcase, x86_64: -O0: 6s, 1GB -O1: 264s, 1.4GB callgraph ipa passes : 30.47 ( 12%) alias stmt walking : 67.44 ( 26%) tree loop invariant motion : 120.86 ( 46%) -O2: 1383s, 11.8GB alias stmt walking : 174.01 ( 13%) tree PRE : 87.85 ( 6%) tree loop invariant motion : 130.54 ( 9%) tree slp vectorization : 100.01 ( 7%) PRE : 716.64 ( 52%) quite some regression on the peak memory usage side here.
