gcc/testsuite/gcc.dg/pr112536.c

   1 /* PR tree-optimization/112536 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fno-ipa-icf" } */
   4 /* { dg-additional-options "-mlzcnt -mavx512cd -mavx512vl" { target { i?86-*-* x86_64-*-* } } } */
   5 /* { dg-final { scan-assembler-times "\tvplzcntd\t" 3 { target { i?86-*-* x86_64-*-* } } } } */
   6
   7 unsigned a[12];
   8
   9 void
  10 foo (void)
  11 {
  12   int i = a[0];
  13   int j = a[1];
  14   int k = a[2];
  15   int l = a[3];
  16   int e = i ? __builtin_clz (i) : __SIZEOF_INT__ * __CHAR_BIT__;
  17   int f = j ? __builtin_clz (j) : __SIZEOF_INT__ * __CHAR_BIT__;
  18   int g = k ? __builtin_clz (k) : __SIZEOF_INT__ * __CHAR_BIT__;
  19   int h = l ? __builtin_clz (l) : __SIZEOF_INT__ * __CHAR_BIT__;
  20   a[0] = e;
  21   a[1] = f;
  22   a[2] = g;
  23   a[3] = h;
  24 }
  25
  26 void
  27 bar (void)
  28 {
  29   int i = a[4];
  30   int j = a[5];
  31   int k = a[6];
  32   int l = a[7];
  33   int e = i ? __builtin_clz (i) : __SIZEOF_INT__ * __CHAR_BIT__;
  34   int f = __builtin_clz (j);
  35   int g = __builtin_clz (k);
  36   int h = l ? __builtin_clz (l) : __SIZEOF_INT__ * __CHAR_BIT__;
  37   a[4] = e;
  38   a[5] = f;
  39   a[6] = g;
  40   a[7] = h;
  41 }
  42
  43 void
  44 baz (void)
  45 {
  46   int i = a[8];
  47   int j = a[9];
  48   int k = a[10];
  49   int l = a[11];
  50   int e = __builtin_clz (i);
  51   int f = j ? __builtin_clz (j) : __SIZEOF_INT__ * __CHAR_BIT__;
  52   int g = __builtin_clz (k);
  53   int h = l ? __builtin_clz (l) : __SIZEOF_INT__ * __CHAR_BIT__;
  54   a[8] = e;
  55   a[9] = f;
  56   a[10] = g;
  57   a[11] = h;
  58 }