https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109760
Bug ID: 109760 Summary: riscv Internal compiler error in extract_insn after addition of XTheadCondMov Product: gcc Version: 13.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: sepotvin at gmail dot com Target Milestone: --- I get the following internal compiler error after the addition of support of XTheadCondMov in commit "basepoints/gcc-13-6686-g8e7ffe126de" when using the following compile options: "-O2 -mcpu=sifive-u74" or "-O1 -mcpu-sifive-u74" with a riscv64-unknown-linux-gnu compiler. The bug is still present on a recent master (basepoints/gcc-14-540-gb7fe38c14e5) ./cross/riscv64/bin/riscv64-unknown-linux-gnu-gcc -O1 -mcpu=sifive-u74 -c ./qgridlayoutengine.ii ./qgridlayoutengine.ii: In function 'void e()': ./qgridlayoutengine.ii:14:1: error: unrecognizable insn: 14 | } | ^ (insn 12 11 13 2 (set (reg:DI 137) (if_then_else:DI (ne:DF (reg:DF 139) (reg:DF 140)) (reg:DI 141) (reg:DI 143))) -1 (nil)) during RTL pass: vregs ./qgridlayoutengine.ii:14:1: internal compiler error: in extract_insn, at recog.cc:2791 0x82e78d _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/rtl-error.cc:108 0x82e7a9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/rtl-error.cc:116 0x82d133 extract_insn(rtx_insn*) /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/recog.cc:2791 0xe80f9d instantiate_virtual_regs_in_insn /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/function.cc:1611 0xe80f9d instantiate_virtual_regs /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/function.cc:1985 0xe80f9d execute /home/spotvin/work/gcc-13.1.0-failure/cross/gcc/gcc/function.cc:2034 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. Here's the code snippet that can reproduce the issue struct a { void b(); } boxes; struct { a boxes; } c; double d; void e() { bool f(d); for (;;) { a &g = f ? c.boxes : boxes; g.b(); } } The output of gcc -v is COLLECT_GCC=./cross/riscv64/bin/riscv64-unknown-linux-gnu-gcc COLLECT_LTO_WRAPPER=/home/spotvin/work/gcc-13.1.0-failure/cross/riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/13.0.1/lto-wrapper Target: riscv64-unknown-linux-gnu Configured with: /home/spotvin/work/gcc-13.1.0-failure/cross/riscv-gnu-toolchain/build/../../gcc/configure --target=riscv64-unknown-linux-gnu --prefix=/home/spotvin/work/gcc-13.1.0-failure/cross/riscv-gnu-toolchain/build/../../riscv64 --with-sysroot=/home/spotvin/work/gcc-13.1.0-failure/cross/riscv-gnu-toolchain/build/../../riscv64/sysroot --with-pkgversion=g8e7ffe126de --with-system-zlib --enable-shared --enable-tls --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp --disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap --src=/home/spotvin/work/gcc-13.1.0-failure/cross/gcc --disable-multilib --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2 -mcmodel=medlow' 'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medlow' Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 13.0.1 20230315 (experimental) (g8e7ffe126de) I used a cross-compiler to speedup the bisection of the commit where the issue appeared but I got the same behavior with a native gcc: Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/riscv64-unknown-linux-gnu/13/lto-wrapper Target: riscv64-unknown-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-13.1.0-r1/work/gcc-13.1.0/configure --host=riscv64-unknown-linux-gnu --build=riscv64-unknown-linux-gnu --prefix=/usr --bindir=/usr/riscv64-unknown-linux-gnu/gcc-bin/13 --includedir=/usr/lib/gcc/riscv64-unknown-linux-gnu/13/include --datadir=/usr/share/gcc-data/riscv64-unknown-linux-gnu/13 --mandir=/usr/share/gcc-data/riscv64-unknown-linux-gnu/13/man --infodir=/usr/share/gcc-data/riscv64-unknown-linux-gnu/13/info --with-gxx-include-dir=/usr/lib/gcc/riscv64-unknown-linux-gnu/13/include/g++-v13 --with-python-dir=/share/gcc-data/riscv64-unknown-linux-gnu/13/python --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --disable-libunwind-exceptions --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 13.1.0-r1 p1' --with-gcc-major-version-only --disable-esp --enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --disable-multilib --disable-fixed-point --with-abi=lp64d --enable-libgomp --disable-libssp --disable-libada --disable-cet --disable-systemtap --disable-valgrind-annotations --disable-vtable-verify --disable-libvtv --without-zstd --without-isl --enable-default-pie --enable-default-ssp Thread model: posix Supported LTO compression algorithms: zlib gcc version 13.1.0 (Gentoo 13.1.0-r1 p1)