https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77526
Bug ID: 77526 Summary: [7 Regression] ICE: in verify_dominators, at dominance.c:1039 with -mstringop-strategy=byte_loop Product: gcc Version: 7.0 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 Build: x86_64-pc-linux-gnu Created attachment 39583 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39583&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -Os -fno-forward-propagate -fno-gcse -fno-rerun-cse-after-loop -mstringop-strategy=byte_loop testcase.c -Wno-psabi testcase.c: In function 'foo': testcase.c:9:1: error: dominator of 5 should be 4, not 2 } ^ testcase.c:9:1: internal compiler error: in verify_dominators, at dominance.c:1039 0x7bd965 verify_dominators(cdi_direction) /repo/gcc-trunk/gcc/dominance.c:1039 0x7bdb8f checking_verify_dominators /repo/gcc-trunk/gcc/dominance.h:71 0x7bdb8f calculate_dominance_info(cdi_direction) /repo/gcc-trunk/gcc/dominance.c:664 0x74acdd flow_loops_find(loops*) /repo/gcc-trunk/gcc/cfgloop.c:419 0x9ff122 loop_optimizer_init(unsigned int) /repo/gcc-trunk/gcc/loop-init.c:93 0x14dd398 if_convert /repo/gcc-trunk/gcc/ifcvt.c:5407 0x14df20d execute /repo/gcc-trunk/gcc/ifcvt.c:5628 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> 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-240036-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/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 --without-cloog --without-ppl --without-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-240036-checking-yes-rtl-df-extra-nographite-amd64 Thread model: posix gcc version 7.0.0 20160908 (experimental) (GCC) Tested revisions: r240036 - ICE 6-branch r239849 - OK