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From: "heckflosse67 at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96133] New: x86-64 gcc 10.1 using -O3 leads to wrong
 calculation
Date: Thu, 09 Jul 2020 11:38:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96133

            Bug ID: 96133
           Summary: x86-64 gcc 10.1 using -O3 leads to wrong calculation
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: heckflosse67 at gmx dot de
  Target Milestone: ---

Here's a simple example which works fine in gcc up to version 9 when build
using -O3
On gcc 10 -O3, the output is different to the output of gcc 10 -O2.
The output of gcc 10 -O2 is the same as of gcc 9.3 -O3 and gcc 9.3 -O2
Using gcc 10 -O3 -fno-tree-loop-vectorize it also works fine.

```
#include <iostream>

constexpr double xyz_sRGB[3][3] =3D {
    {0.4360747,  0.3850649, 0.1430804},
    {0.2225045,  0.7168786,  0.0606169},
    {0.0139322,  0.0971045,  0.7141733}
};

int main() {
    double rgb_cam[3][3] =3D {{1.0, 2.0, 3.0}, {4.0, 5.0, 6.0}, {7.0, 8.0, =
9.0}};
    double xyz_cam[3][3] =3D {{0.0, 0.0, 0.0}, {0.0, 0.0, 0.0}, {0.0, 0.0, =
0.0}};


    for (int i =3D 0; i < 3; i++)
        for (int j =3D 0; j < 3; j++)
            for (int k =3D 0; k < 3; k++) {
                xyz_cam[i][j] +=3D xyz_sRGB[i][k] * rgb_cam[k][j];
            }

        for (int i =3D 0; i < 3; i++)
            for (int j =3D 0; j < 3; j++) {
                std::cout << xyz_cam[i][j] << std::endl;
            }=20
return 0;
}
```=