view gcc/testsuite/gcc.dg/hoist-register-pressure-1.c @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children
line wrap: on
line source

/* { dg-options "-Os -fdump-rtl-hoist -fno-code-hoisting" }  */
/* The rtl hoist pass requires that the expression to be hoisted can
   be assigned without clobbering cc.  For a PLUS rtx on S/390 this
   requires a load address instruction which is fine on 64 bit but
   cannot be used on 31 bit since it does a 31 bit add only.  */
/* { dg-final { scan-rtl-dump "PRE/HOIST: end of bb .* copying expression" "hoist" { target { { !s390*-*-* || lp64 } && nonpic } } } } */

#define BUF 100
long a[BUF];

void com (long);
void bar (long);

long foo (long x, long y, long z)
{
  /* "x+y" won't be hoisted if "-fira-hoist-pressure" is disabled,
     because its rtx_cost is too small.  */
  if (z)
    {
      a[1] = a[0] + a[2];
      a[2] = a[1] + a[3];
      a[3] = a[2] + a[4];
      a[4] = a[3] + a[5];
      a[5] = a[4] + a[6];
      a[6] = a[5] + a[7];
      a[7] = a[6] + a[8];
      com (x+y);
    }
  else
    {
      bar (x+y);
    }

  return 0;
}