[Bug middle-end/39326] Segmentation fault with -O1, out of memory with -O2

[rguenth at gcc dot gnu.org]

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.