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[Bug c++/78060] New: -O3 causes "error: type mismatch in binary expression"


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78060

            Bug ID: 78060
           Summary: -O3 causes "error: type mismatch in binary expression"
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 39859
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39859&action=edit
C++ source code

The attached source code, when compiled by gcc dated 20161021,
and the compiler flags -O3 -std=c++98, does this:

$ ../results/bin/g++ -c -O3 -std=c++98 bug314.cc
alm_map_tools.cc: In function ‘void map2alm_pol(const std::vector<ringpair>&,
const T*, const T*, const T*, Alm<xcomplex<T> >&, Alm<xcomplex<T> >&,
Alm<xcomplex<T> >&, bool) [with T = float]’:
alm_map_tools.cc:314:27: error: type mismatch in binary expression
long int

long int

int

_2419 = _2421 - m_1338;
alm_map_tools.cc:314:27: internal compiler error: verify_gimple failed
0xec77f9 verify_gimple_in_cfg(function*, bool)
        ../../trunk/gcc/tree-cfg.c:5208
0xd750bb execute_function_todo
        ../../trunk/gcc/passes.c:1965
0xd762e8 do_per_function
        ../../trunk/gcc/passes.c:1649
0xd762e8 execute_todo
        ../../trunk/gcc/passes.c:2015
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Compiles fine with -O2

$ ../results/bin/g++ -c -O2 -std=c++98 bug314.cc
$

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