[Bug middle-end/116555] New: [15 Regression] ifcvt: ICE: verify_gimple failed: mismatching comparison operand types with -O2 -fno-tree-forwprop

[Bug middle-end/116555] New: [15 Regression] ifcvt: ICE: verify_gimple failed: mismatching comparison operand types with -O2 -fno-tree-forwprop

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116555

            Bug ID: 116555
           Summary: [15 Regression] ifcvt: ICE: verify_gimple failed:
                    mismatching comparison operand types with -O2
                    -fno-tree-forwprop
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
          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 59033
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59033&action=edit
auto-reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-forwprop testcase.C 
testcase.C: In function 'void InputLoop()':
testcase.C:16:6: error: mismatching comparison operand types
   16 | void InputLoop() {
      |      ^~~~~~~~~
int
WindowClass
_15 = window_class.1_10 == 2;
testcase.C:16:6: error: mismatching comparison operand types
int
WindowClass
_16 = window_class.1_10 == 0;
during GIMPLE pass: ifcvt
testcase.C:16:6: internal compiler error: verify_gimple failed
0x2ee2c2e internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:492
0x18fa13d verify_gimple_in_cfg(function*, bool, bool)
        /repo/gcc-trunk/gcc/tree-cfg.cc:5681
0x176ad84 execute_function_todo
        /repo/gcc-trunk/gcc/passes.cc:2089
0x176b2de 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/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r15-3345-20240831234259-g592a335de56-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-r15-3345-20240831234259-g592a335de56-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240901 (experimental) (GCC)

[Bug middle-end/116555] [15 Regression] ifcvt: ICE: verify_gimple failed: mismatching comparison operand types with -O2 -fno-tree-forwprop

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116555

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |15.0

[Bug middle-end/116555] [15 Regression] ifcvt: ICE: verify_gimple failed: mismatching comparison operand types with -O2 -fno-tree-forwprop

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116555

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Same underlying issue as PR 116510 .

*** This bug has been marked as a duplicate of bug 116510 ***

[Bug middle-end/116555] [15 Regression] ifcvt: ICE: verify_gimple failed: mismatching comparison operand types with -O2 -fno-tree-forwprop

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116555

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> Same underlying issue as PR 116510 .

Just happens the ICE is different because just happens that match pattern does
not hit in this case.