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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111619] New: [14 regression] 'make profiledbootstrap'
 makes 10+ minutes on insn-recog.cc (x86_64-linux)
Date: Wed, 27 Sep 2023 22:02:53 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111619

            Bug ID: 111619
           Summary: [14 regression] 'make profiledbootstrap' makes 10+
                    minutes on insn-recog.cc (x86_64-linux)
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

The reproducer on gcc from r14-4300-g1fab05a885a308:

$ ~/dev/git/gcc/configure --disable-multilib --enable-languages=3Dc,c++
$ make profiledbootstrap

insn-recog.o takes ~13 min to build on `AMD Ryzen 9 5950X` CPU:

$ time /tmp/gb/./prev-gcc/cc1plus -quiet -nostdinc++ -I
/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I
/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/include -I
/home/slyfox/dev/git/gcc/libstdc++-v3/libsupc++ -I . -I . -I
/home/slyfox/dev/git/gcc/gcc -I /home/slyfox/dev/git/gcc/gcc/. -I
/home/slyfox/dev/git/gcc/gcc/../include -I
/home/slyfox/dev/git/gcc/gcc/../libcpp/include -I
/home/slyfox/dev/git/gcc/gcc/../libcody -I
/home/slyfox/dev/git/gcc/gcc/../libdecnumber -I
/home/slyfox/dev/git/gcc/gcc/../libdecnumber/bid -I ../libdecnumber -I
/home/slyfox/dev/git/gcc/gcc/../libbacktrace -iprefix
/tmp/gb/prev-gcc/../lib/gcc/x86_64-pc-linux-gnu/14.0.0/ -isystem
/tmp/gb/./prev-gcc/include -isystem /tmp/gb/./prev-gcc/include-fixed -MMD
insn-recog.d -MF ./.deps/insn-recog.TPo -MP -MT insn-recog.o -D_GNU_SOURCE =
-D
IN_GCC -D HAVE_CONFIG_H insn-recog.cc -quiet -dumpbase insn-recog.cc
-dumpbase-ext .cc -mtune=3Dgeneric -march=3Dx86-64 -g -gtoggle -O2 -Wextra =
-Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wsuggest-attribute=3Dformat
-Wconditionally-supported -Woverloaded-virtual=3D2 -Wpedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -fno-checking
-fprofile-generate -fno-exceptions -fno-rtti -fasynchronous-unwind-tables
-fno-common -fno-PIE -o /run/user/1000/ccQK54tL.s

real    13m39,864s
user    13m38,263s
sys     0m0,823s

`insn-recog.cc` is 8.3MB.

$ ./prev-gcc/xgcc -Bprev-gcc -v
Reading specs from prev-gcc/specs
COLLECT_GCC=3D./prev-gcc/xgcc
COLLECT_LTO_WRAPPER=3Dprev-gcc/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/slyfox/dev/git/gcc/configure --disable-multilib
--enable-languages=3Dc,c++
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230926 (experimental) (GCC)=