[Bug rtl-optimization/116053] New: [14/15 Regression] during RTL pass: cprop_hardreg ICE: verify_flow_info failed: missing REG_EH_REGION note at the end of bb 2 with -O1 -finstrument-functions -fno-forward-propagate -fno-delete-dead-exceptions -fnon-call-exceptions

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116053

            Bug ID: 116053
           Summary: [14/15 Regression] during RTL pass: cprop_hardreg ICE:
                    verify_flow_info failed: missing REG_EH_REGION note at
                    the end of bb 2 with -O1 -finstrument-functions
                    -fno-forward-propagate -fno-delete-dead-exceptions
                    -fnon-call-exceptions
           Product: gcc
           Version: 15.0
            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 58735
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58735&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O1 -finstrument-functions -fno-forward-propagate
-fno-delete-dead-exceptions -fnon-call-exceptions testcase.c
testcase.c: In function 'foo':
testcase.c:5:1: error: missing REG_EH_REGION note at the end of bb 2
    5 | }
      | ^
during RTL pass: cprop_hardreg
testcase.c:5:1: internal compiler error: verify_flow_info failed
0x2b36e2e internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:491
0x1000a7e verify_flow_info()
        /repo/gcc-trunk/gcc/cfghooks.cc:287
0x1442057 execute_function_todo
        /repo/gcc-trunk/gcc/passes.cc:2101
0x144258e execute_todo
        /repo/gcc-trunk/gcc/passes.cc:2143
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-r15-2220-20240723105132-gb9cefd67a2a-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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 --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 --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r15-2220-20240723105132-gb9cefd67a2a-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240723 (experimental) (GCC)