https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83459
Bug ID: 83459 Summary: [8 Regression] ICE: qsort checking failed: qsort comparator non-negative on sorted output: 1 with --param=sched-pressure-algorithm=2 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 42899 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42899&action=edit reduced testcase This ICE has been reproducing with various testcases, but the used command line switches were needed for all of them (only opt. level and max-sched-extend-regions-iters=n value varies). Compiler output: $ x86_64-pc-linux-gnu-gcc -Og -fschedule-insns -fsched-pressure -fno-sched-critical-path-heuristic -fno-sched-rank-heuristic --param=max-sched-extend-regions-iters=2 --param=sched-pressure-algorithm=2 testcase.c testcase.c: In function 'c': testcase.c:9:1: error: qsort comparator non-negative on sorted output: 1 } ^ during RTL pass: sched1 testcase.c:9:1: internal compiler error: qsort checking failed 0x6be441 qsort_chk_error /repo/gcc-trunk/gcc/vec.c:222 0x1779f5a qsort_chk(void*, unsigned long, unsigned long, int (*)(void const*, void const*)) /repo/gcc-trunk/gcc/vec.c:274 0x1683338 ready_sort_real /repo/gcc-trunk/gcc/haifa-sched.c:3087 0x168c6d2 schedule_block(basic_block_def**, void*) /repo/gcc-trunk/gcc/haifa-sched.c:6675 0xcd688a schedule_region /repo/gcc-trunk/gcc/sched-rgn.c:3174 0xcd688a schedule_insns() /repo/gcc-trunk/gcc/sched-rgn.c:3513 0xcd6cb3 schedule_insns() /repo/gcc-trunk/gcc/sched-rgn.c:3498 0xcd6cb3 rest_of_handle_sched /repo/gcc-trunk/gcc/sched-rgn.c:3717 0xcd6cb3 execute /repo/gcc-trunk/gcc/sched-rgn.c:3825 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-255776-checking-yes-rtl-df-extra-nobootstrap-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 --disable-bootstrap --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-255776-checking-yes-rtl-df-extra-nobootstrap-nographite-amd64 Thread model: posix gcc version 8.0.0 20171218 (experimental) (GCC) Tested revisions: r255776 - ICE r255386 - ICE 7-branch r255536 - OK