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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98928] [11 regression] ICE when build
 638.imagick_s
Date: Tue, 02 Feb 2021 10:33:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98928

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Reduced test-case:

$ cat ice.i
typedef float MagickRealType;
typedef short Quantum;
float InterpolateMagickPixelPacket_alpha[1];
int InterpolateMagickPixelPacket_i;

void InterpolateMagickPixelPacket();

void main() { InterpolateMagickPixelPacket(); }

typedef struct {
  MagickRealType red, green, blue, opacity, index;
} MagickPixelPacket;
typedef struct {
  Quantum blue, green, red, opacity;
} PixelPacket;
struct _Image {
  int colorspace;
  int matte;
} GetMagickPixelPacket(MagickPixelPacket *pixel) {
  pixel->red =3D pixel->green =3D pixel->blue =3D 0.0;
}
int AlphaBlendMagickPixelPacket(struct _Image *image, PixelPacket *color,
                            Quantum *indexes, MagickPixelPacket *pixel,
                            MagickRealType *alpha) {
  if (image->matte) {
    *alpha =3D pixel->red =3D pixel->green =3D pixel->blue =3D pixel->opaci=
ty =3D
        color->opacity;
    pixel->index =3D 0.0;
    if (image->colorspace)
      pixel->index =3D *indexes;
    return 0;
  }
  *alpha =3D 1.0 / 0.2;
  pixel->red =3D *alpha * color->red;
  pixel->green =3D *alpha * color->green;
  pixel->blue =3D *alpha * color->blue;
  pixel->opacity =3D pixel->index =3D 0.0;
  if (image->colorspace && indexes)
    pixel->index =3D *indexes;
}
MagickPixelPacket InterpolateMagickPixelPacket_pixels[1];
PixelPacket InterpolateMagickPixelPacket_p;

void
InterpolateMagickPixelPacket(struct _Image *image) {
  Quantum *indexes;
  for (; InterpolateMagickPixelPacket_i; InterpolateMagickPixelPacket_i++) {
    GetMagickPixelPacket(InterpolateMagickPixelPacket_pixels +
                         InterpolateMagickPixelPacket_i);
    AlphaBlendMagickPixelPacket(
        image, &InterpolateMagickPixelPacket_p +
InterpolateMagickPixelPacket_i,
        indexes + InterpolateMagickPixelPacket_i,
        InterpolateMagickPixelPacket_pixels + InterpolateMagickPixelPacket_=
i,
        InterpolateMagickPixelPacket_alpha + InterpolateMagickPixelPacket_i=
);
  }
}

one needs the following options: gcc -Ofast -march=3Dskylake-avx512 ice.i
-fwhole-program=