gcc/testsuite/gcc.dg/20020426-2.c

   1 /* PR optimization/6475
   2    Distilled from zlib sources.  */
   3 /* { dg-do run } */
   4 /* { dg-options "-O2" } */
   5 /* { dg-options "-O2 -frename-registers -fomit-frame-pointer -fPIC -mtune=i686" { target i?86-*-* } } */
   6 /* { dg-skip-if "" { i?86-*-* } { "-m64" } { "" } } */
   7 /* { dg-bogus "\[Uu\]nresolved symbol .(_GLOBAL_OFFSET_TABLE_|\[_.A-Za-z\]\[_.0-9A-Za-z\]*@(PLT|GOT|GOTOFF))" "PIC unsupported" { xfail *-*-netware* } 0 } */
   8
   9 extern void exit (int);
  10
  11 typedef struct
  12 {
  13   union
  14   {
  15     struct
  16     {
  17       unsigned char a3;
  18       unsigned char a4;
  19     } a2;
  20     unsigned int a5;
  21   } a0;
  22   unsigned int a1;
  23 } A;
  24
  25 static int
  26 foo (unsigned int *b, unsigned int n, unsigned int s, const unsigned int *d,
  27      const unsigned int *e, A **t, unsigned int *m, A *hp, unsigned int *hn,
  28      unsigned int *v)
  29 {
  30   unsigned int a, c[15 + 1], f;
  31   int g, h;
  32   unsigned int i, j, k;
  33   int l;
  34   unsigned int ee;
  35   unsigned int *p;
  36   A *q, r, *u[15];
  37   int w;
  38   unsigned int x[15 + 1], *xx;
  39   int y;
  40   unsigned int z;
  41   p = c;
  42   *p++ = 0; *p++ = 0; *p++ = 0; *p++ = 0;
  43   *p++ = 0; *p++ = 0; *p++ = 0; *p++ = 0;
  44   *p++ = 0; *p++ = 0; *p++ = 0; *p++ = 0;
  45   *p++ = 0; *p++ = 0; *p++ = 0; *p++ = 0;
  46   p = b;
  47   i = n;
  48   do
  49     c[*p++]++;
  50   while (--i);
  51   if (c[0] == n)
  52     {
  53       *t = (A *) 0;
  54       *m = 0;
  55       return 0;
  56     }
  57   l = *m;
  58   for (j = 1; j <= 15; j++)
  59     if (c[j])
  60       break;
  61   k = j;
  62   if ((unsigned int) l < j)
  63     l = j;
  64   for (i = 15; i; i--)
  65     if (c[i])
  66       break;
  67   g = i;
  68   if ((unsigned int) l > i)
  69     l = i;
  70   *m = l;
  71   for (y = 1 << j; j < i; j++, y <<= 1)
  72     if ((y -= c[j]) < 0)
  73       return -3;
  74   if ((y -= c[i]) < 0)
  75     return -3;
  76   c[i] += y;
  77   x[1] = j = 0;
  78   p = c + 1;
  79   xx = x + 2;
  80   while (--i)
  81     *xx++ = (j += *p++);
  82   p = b;
  83   i = 0;
  84   do
  85     if ((j = *p++) != 0)
  86       v[x[j]++] = i;
  87   while (++i < n);
  88   n = x[g];
  89   x[0] = i = 0;
  90   p = v;
  91   h = -1;
  92   w = -l;
  93   u[0] = (A *) 0;
  94   q = (A *) 0;
  95   z = 0;
  96   for (; k <= g; k++)
  97     {
  98       a = c[k];
  99       while (a--)
 100         {
 101           while (k > w + l)
 102             {
 103               h++;
 104               w += l;
 105               z = g - w;
 106               z = z > (unsigned int) l ? l : z;
 107               if ((f = 1 << (j = k - w)) > a + 1)
 108                 {
 109                   f -= a + 1;
 110                   xx = c + k;
 111                   if (j < z)
 112                     while (++j < z)
 113                       {
 114                         if ((f <<= 1) <= *++xx)
 115                           break;
 116                         f -= *xx;
 117                       }
 118                 }
 119               z = 1 << j;
 120               if (*hn + z > 1440)
 121                 return -3;
 122               u[h] = q = hp + *hn;
 123               *hn += z;
 124               if (h)
 125                 {
 126                   x[h] = i;
 127                   r.a0.a2.a4 = (unsigned char) l;
 128                   r.a0.a2.a3 = (unsigned char) j;
 129                   j = i >> (w - l);
 130                   r.a1 = (unsigned int) (q - u[h - 1] - j);
 131                   u[h - 1][j] = r;
 132                 }
 133               else
 134                 *t = q;
 135             }
 136           r.a0.a2.a4 = (unsigned char) (k - w);
 137           if (p >= v + n)
 138             r.a0.a2.a3 = 128 + 64;
 139           else if (*p < s)
 140             {
 141               r.a0.a2.a3 = (unsigned char) (*p < 256 ? 0 : 32 + 64);
 142               r.a1 = *p++;
 143             }
 144           else
 145             {
 146               r.a0.a2.a3 = (unsigned char) (e[*p - s] + 16 + 64);
 147               r.a1 = d[*p++ - s];
 148             }
 149           f = 1 << (k - w);
 150           for (j = i >> w; j < z; j += f)
 151             q[j] = r;
 152           for (j = 1 << (k - 1); i & j; j >>= 1)
 153             i ^= j;
 154           i ^= j;
 155           ee = (1 << w) - 1;
 156           while ((i & ee) != x[h])
 157             {
 158               h--;
 159               w -= l;
 160               ee = (1 << w) - 1;
 161             }
 162         }
 163     }
 164   return y != 0 && g != 1 ? (-5) : 0;
 165 }
 166
 167 unsigned int a[19] = { 3, 4, 0, 2, 2, [17] = 3, 3 };
 168 unsigned int d[19];
 169 A h[1440];
 170
 171 int
 172 main (void)
 173 {
 174   unsigned int b = 0, c = 0;
 175   A *e = 0;
 176   foo (a, 19, 19, 0, 0, &e, &b, h, &c, d);
 177   exit (0);
 178 }