https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82881
Bug ID: 82881 Summary: [8 Regression] ICE: in df_compact_blocks, at df-core.c:1729 with -freorder-blocks-algorithm=simple Product: gcc Version: 8.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: rtl-optimization 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 42558 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42558&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -O2 -freorder-blocks-algorithm=simple testcase.c during RTL pass: bbro testcase.c: In function 'foo': testcase.c:7:1: internal compiler error: in df_compact_blocks, at df-core.c:1729 } ^ 0x8a6b3f df_compact_blocks() /repo/gcc-trunk/gcc/df-core.c:1729 0x1543a45 compact_blocks() /repo/gcc-trunk/gcc/cfg.c:160 0x153c150 reorder_basic_blocks /repo/gcc-trunk/gcc/bb-reorder.c:2502 0x153c150 execute /repo/gcc-trunk/gcc/bb-reorder.c:2592 Please submit a full bug report, with preprocessed source if appropriate. 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-254487-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/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-254487-checking-yes-rtl-df-extra-nographite-amd64 Thread model: posix gcc version 8.0.0 20171107 (experimental) (GCC)