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From: "dje at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102519] [12 Regression] VRP Jump threader memory
 explosion
Date: Wed, 29 Sep 2021 15:59:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102519

--- Comment #12 from David Edelsohn <dje at gcc dot gnu.org> ---
GCC non-quiet mode shows:

...
g_31_31_16 f_31_31_17 g_31_31_17 f_31_31_23 g_31_31_23 f_31_31_24 g_31_31_24
f_31_31_25 g_31_31_25 f_31_31_29 g_31_31_29 f_31_31_30 g_31_31_30 f_31_31_31
g_31_31_31
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> {heap 4160k} <visibility> {heap 4288k} <build_ssa_passes>
{heap 4288k} <opt_local_passes> {heap 4416k} <remove_symbols> {heap 9985k}
<targetclone> {heap 9985k} <free-fnsummary> {heap 9985k}Streaming LTO
 <whole-program> {heap 12M} <profile_estimate> {heap 12M} <icf> {heap 15M}
<devirt> {heap 15M} <cp> {heap 15M} <sra> {heap 15M} <cdtor> {heap 15M}
<fnsummary> {heap 15M} <inline> {heap 15M} <pure-const> {heap 16M} <modref>
{heap 16M} <free-fnsummary> {heap 16M} <static-var> {heap 16M} <single-use>
{heap 16M}
Assembling functions:
 f_0_0_0 g_0_0_0 f_0_0_1 g_0_0_1 f_0_0_2 g_0_0_2 f_0_0_7 g_0_0_7 f_0_0_8
g_0_0_8 f_0_0_9 g_0_0_9 f_0_0_15 g_0_0_15 f_0_0_16 g_0_0_16 f_0_0_17 g_0_0_=
17
f_0_0_23=20
...
f_17_15_9 g_17_15_9 f_17_15_15 g_17_15_15 f_17_15_16 g_17_15_16 f_17_15_17
g_17_15_17 f_17_15_23
cc1: out of memory allocating 65536 bytes after a total of 1071778432 bytes

Somehow the VRP threader change provoked this change in memory usage and
failure mode.=