[Bug tree-optimization/43784] [4.6 Regression] -Os -fkeep-inline-functions causes FAIL: gcc.c-torture/execute/builtins/pr22237.c execution

[matz at gcc dot gnu dot org]

------- Comment #9 from matz at gcc dot gnu dot org  2010-07-26 15:06 -------
Here's a testcase (nicer in the sense of not requiring inlining) that shows
the current compiler botching the nrv <-> retslot optimizations:

struct S {int x, y, makemelarge[5];};
S __attribute__((noinline)) f (S &s) {
  S r;
  r.x = s.y;
  r.y = s.x;
  return r;
}
int __attribute__((noinline)) glob (int a, int b)
{
  S local = { a, b };
  local = f (local);
  return local.y;
}
extern "C" void abort (void);
int main (void)
{
  if (glob (1, 3) != 1)
    abort ();
  return 0;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43784