https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113660
Bug ID: 113660 Summary: ICE: verify_flow_info failed: missing REG_EH_REGION note at the end of bb 2 with -fnon-call-exceptions -fharden-control-flow-redundancy on invalid Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: ice-on-invalid-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 57254 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57254&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -fnon-call-exceptions -fharden-control-flow-redundancy testcase.c testcase.c: In function 'foo': testcase.c:5:3: error: impossible constraint in 'asm' 5 | __asm__ volatile("" : "=a"(i)); | ^~~~~~~ testcase.c:6:1: error: missing REG_EH_REGION note at the end of bb 2 6 | } | ^ during RTL pass: into_cfglayout testcase.c:6:1: internal compiler error: verify_flow_info failed 0xf904ae verify_flow_info() /repo/gcc-trunk/gcc/cfghooks.cc:287 0x268381b checking_verify_flow_info() /repo/gcc-trunk/gcc/cfghooks.h:214 0x268381b try_optimize_cfg /repo/gcc-trunk/gcc/cfgcleanup.cc:2980 0x268381b cleanup_cfg(int) /repo/gcc-trunk/gcc/cfgcleanup.cc:3143 0xfaaf8a execute /repo/gcc-trunk/gcc/cfgrtl.cc:3713 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-r14-8487-20240129102032-gb338fdbc2b7-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.1/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-r14-8487-20240129102032-gb338fdbc2b7-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 14.0.1 20240129 (experimental) (GCC)