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From: "yshuiv7 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114566] Misaligned vmovaps when compiling libvorbis for
 znver4
Date: Tue, 02 Apr 2024 20:22:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114566

--- Comment #4 from Yuxuan Shui <yshuiv7 at gmail dot com> ---
Reduced a bit further:

void setup_tone_curves(float binHz, float center_decay_rate) {
  float workc[8][56];
  memset(workc, 0, sizeof(workc));

  for (int j =3D 0; j < 8; j++) {
    for (int k =3D 0; k < 56; k++) {
      float adj =3D  k * center_decay_rate;
      if (adj < 0.)
        adj =3D 0.;
      if (adj > 0.)
        adj =3D 0.;
      workc[j][k] +=3D adj;
    }
  }

  int lo_curve =3D log(binHz);
}

Some observations:

1. lo_curve, although dead code, triggers the bug.
2. the 2 if's in the loop are also required for this bug.
3. workc has to be initialized with memset, aggregate initializer doesn't
trigger the bug.=