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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/113226] New: [14 Regression]
 testsuite/std/ranges/iota/max_size_type.cc fails for cris-elf after
 r14-6888-ga138b99646a555
Date: Thu, 04 Jan 2024 00:59:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113226

            Bug ID: 113226
           Summary: [14 Regression]
                    testsuite/std/ranges/iota/max_size_type.cc fails for
                    cris-elf after r14-6888-ga138b99646a555
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hp at gcc dot gnu.org
  Target Milestone: ---

After r14-6888-ga138b99646a555, I see, for cris-elf (32-bit target, no 128b=
it):
FAIL: std/ranges/iota/max_size_type.cc  -std=3Dgnu++20 execution test
FAIL: std/ranges/iota/max_size_type.cc  -std=3Dgnu++26 execution test

And in the .log:

spawn cris-elf-run ./max_size_type.exe^
Inconsistency found: 1 0 -100 -100^
/x/gcc/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc:246: void
test02() [with bool signed_p =3D true; bool shorten_p =3D false]: Assertion=
 '0'
failed.
program stopped with signal 6 (Aborted).
FAIL: std/ranges/iota/max_size_type.cc  -std=3Dgnu++20 execution test

Changing all s/ok &=3D/VERIFY/ (plus adding one level of parentheses to one=
 of
the lines) show:

/x/gcc/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc:217: void
test02() [with bool signed_p =3D true; bool shorten_p =3D false]: Assertion=
 'i*j =3D=3D
shorten_type(max_type(i)*j)' failed.
program stopped with signal 6 (Aborted).

Further instrumentation, adding among other lines:
```
          if (signed_p && ! shorten_p)
            std::cerr << "j =3D=3D " << int64_t(j) << std::endl;
          if (!(i*j =3D=3D shorten_type(max_type(i)*j)))
            {
              std::cerr << "i =3D=3D " << int64_t(i) << ", j =3D=3D " << j =
<< ", i*j =3D=3D
" << int64_t(i*j) << ", max_type(i) =3D=3D \
" << int64_t(max_type(i));
              std::cerr << ", max_type(i)*j =3D=3D " << int64_t(max_type(i)=
*j) <<
std::endl;
            }
'''=20

shows that this is (see above for template parameters):
i =3D=3D 1, j =3D=3D -100, i*j =3D=3D 4294967196, max_type(i) =3D=3D 1, max=
_type(i)*j =3D=3D -100

and that large number is as you might guess, (unsigned) -100.

Not sure if this is a bug in the testcase or elsewhere, but I'll start my
guessing with testsuite.=