gcc/testsuite/g++.dg/tree-ssa/loop-split-1.C

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -fdump-tree-lsplit-details -std=c++11" } */
   3 #include <vector>
   4 #include <cmath>
   5
   6 constexpr unsigned s = 100000000;
   7
   8 int main()
   9 {
  10     std::vector<float> a, b, c;
  11     a.reserve(s);
  12     b.reserve(s);
  13     c.reserve(s);
  14
  15     for(unsigned i = 0; i < s; ++i)
  16     {
  17         if(i == 0)
  18             a[i] = b[i] * c[i];
  19         else
  20             a[i] = (b[i] + c[i]) * c[i-1] * std::log(i);
  21     }
  22 }
  23 /* { dg-final { scan-tree-dump-times "loop split" 1 "lsplit" } } */