https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104458
Bug ID: 104458 Summary: [11/12 Regression] ICE: SIGSEGV in gen_udivmodhiqi3 -> copy_rtx with -O1 -m8bit-idiv Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Target Milestone: --- Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu Created attachment 52384 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52384&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -O1 -m8bit-idiv testcase.c -wrapper valgrind,-q ==18265== Invalid read of size 2 ==18265== at 0x131DB41: copy_rtx(rtx_def*) (rtl.cc:290) ==18265== by 0x1B857B0: gen_udivmodhiqi3(rtx_def*, rtx_def*, rtx_def*) (insn-emit.cc:1592) ==18265== by 0x17C9E9C: ix86_split_idivmod(machine_mode, rtx_def**, bool) (i386-expand.cc:1469) ==18265== by 0x1C5D40D: gen_split_167(rtx_insn*, rtx_def**) (i386.md:8758) ==18265== by 0x21D8CDC: split_insns(rtx_def*, rtx_insn*) (i386.md:15576) ==18265== by 0xF725E8: try_split(rtx_def*, rtx_insn*, int) (emit-rtl.cc:3795) ==18265== by 0x12DCBC9: split_insn(rtx_insn*) (recog.cc:3362) ==18265== by 0x12E3D27: split_all_insns() (recog.cc:3466) ==18265== by 0x12E3DD8: (anonymous namespace)::pass_split_all_insns::execute(function*) (recog.cc:4384) ==18265== by 0x128CC49: execute_one_pass(opt_pass*) (passes.cc:2637) ==18265== by 0x128D50F: execute_pass_list_1(opt_pass*) (passes.cc:2737) ==18265== by 0x128D521: execute_pass_list_1(opt_pass*) (passes.cc:2738) ==18265== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==18265== during RTL pass: split1 testcase.c: In function 'foo': testcase.c:9:1: internal compiler error: Segmentation fault 9 | } | ^ 0x139854f crash_signal /repo/gcc-trunk/gcc/toplev.cc:322 0x131db41 copy_rtx(rtx_def*) /repo/gcc-trunk/gcc/rtl.cc:290 0x1b857b0 gen_udivmodhiqi3(rtx_def*, rtx_def*, rtx_def*) /repo/build-gcc-trunk-amd64/gcc/insn-emit.cc:1592 0x17c9e9c ix86_split_idivmod(machine_mode, rtx_def**, bool) /repo/gcc-trunk/gcc/config/i386/i386-expand.cc:1469 0x1c5d40d gen_split_167(rtx_insn*, rtx_def**) /repo/gcc-trunk/gcc/config/i386/i386.md:8758 0x21d8cdc split_insns(rtx_def*, rtx_insn*) /repo/gcc-trunk/gcc/config/i386/i386.md:15576 0xf725e8 try_split(rtx_def*, rtx_insn*, int) /repo/gcc-trunk/gcc/emit-rtl.cc:3795 0x12dcbc9 split_insn /repo/gcc-trunk/gcc/recog.cc:3362 0x12e3d27 split_all_insns() /repo/gcc-trunk/gcc/recog.cc:3466 0x12e3dd8 execute /repo/gcc-trunk/gcc/recog.cc:4384 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. $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-7124-20220209171435-g59b31f0e2d1-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra --disable-bootstrap --with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld --with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-r12-7124-20220209171435-g59b31f0e2d1-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 12.0.1 20220209 (experimental) (GCC)