[Bug c++/64110] New: ICE: Max. number of generated reload insns per insn is achieved (90)

["thiago at kde dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64110

            Bug ID: 64110
           Summary: ICE: Max. number of generated reload insns per insn is
                    achieved (90)
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thiago at kde dot org

When compiling the attached preprocessed sources, GCC 5 (trunk r218173) prints
the following:

/home/thiago/src/qt/qt5/qtbase/src/corelib/tools/qstringargbuilder.cpp: In
function âreplaceArgEscapes(QString const&, ArgEscapeData const&, int, QString
const&, QString const&, QChar)â:
/home/thiago/src/qt/qt5/qtbase/src/corelib/tools/qstringargbuilder.cpp:236:1:
internal compiler error: Max. number of generated reload insns per insn is
achieved (90)

 }
 ^
0xb58ff0 lra_constraints(bool)
        /home/thiago/src/gcc/gcc/lra-constraints.c:4225
0xb48f01 lra(_IO_FILE*)
        /home/thiago/src/gcc/gcc/lra.c:2277
0xb08109 do_reload
        /home/thiago/src/gcc/gcc/ira.c:5391
0xb08109 execute
        /home/thiago/src/gcc/gcc/ira.c:5561

Original command-line:
g++ -c -pipe -pipe -march=core-avx2 -mno-rtm -mno-hle -std=c++0x -pthread -O3
-g -maccumulate-outgoing-args -O3 -fvisibility=hidden
-fvisibility-inlines-hidden -std=c++0x -flto -ffat-lto-objects -Wall -W -Werror
-Wno-error=cpp -Wno-error=deprecated-declarations -Wno-error=strict-overflow
-D_REENTRANT -fPIC -DQT_NO_USING_NAMESPACE -DQT_BUILD_CORE_LIB -DQT_BUILDING_QT
-DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT
-DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS
-DQT_DISABLE_DEPRECATED_BEFORE=0x050000
-DELF_INTERPRETER=\"/lib64/ld-linux-x86-64.so.2\" -DQT_USE_ICU -DQT_CORE_LIB
-D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG
-I/home/thiago/src/qt/qt5/qtbase/mkspecs/linux-g++-optimised
-I/home/thiago/src/qt/qt5/qtbase/src/corelib -I../../include
-I../../include/QtCore -I../../include/QtCore/5.4.0
-I../../include/QtCore/5.4.0/QtCore -Iglobal
-I/home/thiago/src/qt/qt5/qtbase/src/3rdparty/harfbuzz/src
-I/home/thiago/src/qt/qt5/qtbase/src/3rdparty/md5
-I/home/thiago/src/qt/qt5/qtbase/src/3rdparty/md4
-I/home/thiago/src/qt/qt5/qtbase/src/3rdparty/sha3
-I/home/thiago/src/qt/qt5/qtbase/src/3rdparty/forkfd -isystem
/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I.moc -I.
/home/thiago/src/qt/qt5/qtbase/src/corelib/tools/qstringargbuilder.cpp -o
.obj/qstringargbuilder.o

Minimal command-line for the .ii source:
g++ -c -march=core-avx2 -mno-rtm -mno-hle -std=c++0x -pthread -O3 -D_REENTRANT
-fPIC qstringargbuilder.ii -o .obj/qstringargbuilder.o

If I remove the -march=core-avx2 option and compile the original .cpp file,
there is no error.