[Bug target/54989] FAIL: gcc.dg/hoist-register-pressure.c scan-rtl-dump hoist "PRE/HOIST: end of bb .* copying expression" on darwin

[amker.cheng at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54989

bin.cheng <amker.cheng at gmail dot com> changed:

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                 CC|                            |amker.cheng at gmail dot
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--- Comment #1 from bin.cheng <amker.cheng at gmail dot com> 2012-10-20 05:40:08 UTC ---
The failure is caused by higher register pressure in the THEN branch of the
case, though I am not sure why the register pressure is higher than x86-linux.

This can be fixed by simplifying test case as below:

/* { dg-options "-Os -fdump-rtl-hoist" }  */
/* { dg-final { scan-rtl-dump "PRE/HOIST: end of bb .* copying expression"
"hoist" } } */

#define BUF 100
int a[BUF];

void com (int);
void bar (int);

int foo (int x, int y, int 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[1];
      a[3] = a[2];
      a[4] = a[3];
      a[5] = a[4];
      a[6] = a[5];
      a[7] = a[6];
      com (x+y);
    }
  else
    {
      bar (x+y);
    }

  return 0;
}

I will send a patch fixing this.