gcc/testsuite/gcc.dg/var-expand1.c

   1 /* { dg-do compile } */
   2 /* We don't (and don't want to) perform this optimisation on soft-float
   3    targets, where each addition is a library call.  */
   4 /* { dg-require-effective-target hard_float } */
   5 /* { dg-options "-O2 -funroll-loops --fast-math -fvariable-expansion-in-unroller -fdump-rtl-loop2_unroll" } */
   6 /* { dg-additional-options "--param max-completely-peel-times=16  --param max-unroll-times=8" { target s390*-*-* } } */
   7
   8 extern void abort (void);
   9
  10 float array[30] = { 1,2,3,4,5,6,7,8,9,10 };
  11
  12 int foo (int n)
  13 {
  14   unsigned i;
  15   float accum = 1.0;
  16
  17   for (i = 0; i < n; i++)
  18     accum += array[i];
  19
  20   return accum;
  21 }
  22
  23 int main (void)
  24 {
  25   return foo (10);
  26 }
  27
  28 /* { dg-final { scan-rtl-dump "Expanding Accumulator" "loop2_unroll" } } */