[tree-ssa] Miscompilation (SIGSEGV) with -ffast-math (!?)

[law@redhat.com]

In message <403A0162.2070207@tat.physik.uni-tuebingen.de>, Richard Guenther wri
tes:
 >My favorite testcase is miscompiled by g++-ssa (GCC) 3.5-tree-ssa 
 >20040220 (merged 20040211) causing it to segfault when using -O2 
 >-ffast-math as opposed to -O2 which is fine (cmdline params "-n 10").
Note I'm not getting the segfault.   However, I was able to fix the 
insane compile-time regression -- we were spending an absurd amount of
time walking page table lists in ggc_free.


jeff