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[Bug rtl-optimization/68173] gcc does not terminate with -O0 on source file with a very large expression
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 02 Nov 2015 11:09:49 +0000
- Subject: [Bug rtl-optimization/68173] gcc does not terminate with -O0 on source file with a very large expression
- Auto-submitted: auto-generated
- References: <bug-68173-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68173
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ra
CC| |vmakarov at gcc dot gnu.org
Component|c |rtl-optimization
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, peak memory occurs during RA (as expected, DF ...).
p x_rtl.emit.x_reg_rtx_no
$3 = 5328459
that's a lot of pseudos (at -O0 probably still all used). The BB is also
very large thus peak occurs within BB-local DF routines like
df_lr_bb_local_compute (which also end up very slow).
The suggested patch has no effect on the above number.