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From: "liuhongt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114396] [13/14 Regression] Vector: Runtime
 mismatch at -O2 with -fwrapv since r13-7988-g82919cf4cb2321
Date: Thu, 21 Mar 2024 03:25:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114396

--- Comment #17 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
> >=20
> > The to_mpz args look like they could be mixing signs as well:
> >=20
I tries below, looks like mixing signs works well.
debug show step_expr is -5 and signed.

short a =3D 0xF;
short b[16];
unsigned short ua =3D 0xF;
unsigned short ub[16];

int main() {
  for (int e =3D 0; e < 9; e +=3D 1)
    b[e] =3D a *=3D 0x5;
  __builtin_printf("decimal: %d\n", a);
  __builtin_printf("hex: %X\n", a);

  for (int e =3D 0; e < 9; e +=3D 1)
    b[e] =3D a *=3D -5;
  __builtin_printf("decimal: %d\n", a);
  __builtin_printf("hex: %X\n", a);

  for (int e =3D 0; e < 9; e +=3D 1)
    ub[e] =3D ua *=3D 0x5;
  __builtin_printf("decimal: %d\n", ua);
  __builtin_printf("hex: %X\n", ua);

  for (int e =3D 0; e < 9; e +=3D 1)
    ub[e] =3D ua *=3D -5;
  __builtin_printf("decimal: %d\n", ua);
  __builtin_printf("hex: %X\n", ua);

}=