gcc/testsuite/gcc.dg/ira-loop-pressure.c

   1 /* Loop2_invariants pass should distinguish register pressures of different
   2    register classes.  In this case, register pressue of INT is high.  But
   3    we can still move the FP invariant out of the loop.  */
   4
   5 /* { dg-do compile { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
   6 /* { dg-options "-O2 -fira-loop-pressure -fdump-rtl-loop2_invariant " } */
   7
   8 float tt;
   9 extern void foo2 (int *, int *, int *, int *, int *, int *);
  10 extern int foo3 (int, int, int, int, int, int);
  11 int foo (int a, int b, int c, int d)
  12 {
  13    int i = a;
  14    int t1, t2, t3, t4, t5, t6;
  15    t1 = t2 = t3 = t4 = t5 = t6 = 0;
  16
  17    for (; i > 0; i += c)
  18     {
  19       tt += 123456.0;
  20       if (d > t1 + t2)
  21         tt = 3.0;
  22       foo2 (&t1, &t2, &t3, &t4, &t5, &t6);
  23       t1 += t3 + t4 + a + b;
  24       t2 -= t5 - t6 - c - d;
  25     }
  26
  27  return foo3 (t1, t2, t3, t4, t5, t6);
  28 }
  29
  30 /* { dg-final { scan-rtl-dump "Decided to move invariant" "loop2_invariant"  } } */
  31