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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/19055] Minor bit optimization with or and xor
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------- Additional Comments From pinskia at gcc dot gnu dot org  2004-12-17 14:25 -------
Another example where we don't get the optimization and f1 is still one instruction (on 32bit PPC):
int f(int a,int b)
{
  a|=b;
  a^=b;
  return a;
}

int f1(int a,int b)
{
  return a&=~b;
}

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19055