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


On Tuesday 24 February 2004 05:00, law@redhat.com wrote:
> 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.

In that case you may want to revive a patch I had some time ago to
have per-order page lists.  See PR10944.  Andrew Pinski reported that
bug but I was never able to reproduce it and Andrew never tested the
patch.

Gr.
Steven


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