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From: "rdapp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/114027] [14] RISC-V vector: miscompile at -O3
Date: Thu, 22 Feb 2024 09:06:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114027

--- Comment #9 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Argh,  I actually just did a gcc -O3 -march=3Dnative pr114027.c
-fno-vect-cost-model on cfarm188 with a recent-ish GCC but realized that I =
used
my slightly modified version and not the original test case.

long a;
int b[10][8] =3D {{},
        {},
        {},
        {},
        {},
        {},
        {0, 0, 0, 0, 0, 1, 1},
        {1, 1, 1, 1, 1, 1, 1},
        {1, 1, 1, 1, 1, 1, 1}};
int c;
int main() {
        int d;
        c =3D 0xFFFFFFFF;
        for (; a < 6; a++) {
                d =3D 0;
                for (; d < 6; d++) {
                        c ^=3D -3L;
                        if (b[a + 3][d])
                                continue;
                        c =3D 0;
                }
        }

        if (c =3D=3D -3) {
                return 0;
        } else {
                return 1;
        }
}

This was from an initial attempt to minimize it further but I didn't really
verify if I'm breaking the test case by that (or causing undefined behavior=
).

With that I get a "1" with default options and "0" with -fno-tree-vectorize.
Maybe my snippet is broken then?=