Re: [patch gimplifier]: Boolify more strict conditional expressions and transform simple form to binary

[Kai Tietz <ktietz70@googlemail.com>]

For more detail what happens and why this conditional handling is necessary:

The sample code is:

int
foo (int a, int b)
{
  return (a ? b != 3 : 0);
}

leads for variant without condition boolifying of arms to:

;; Function foo (foo)

foo (int a, int b)
{
  int D.1991;
  int D.1990;
  int D.1989;

<bb 2>:
  D.1990_2 = a_1(D) != 0;
  D.1991_4 = b_3(D) != 3;
  D.1989_5 = D.1991_4 & D.1990_2;
  return D.1989_5;

}

with this code we see


;; Function foo (foo)

foo (int a, int b)
{
  _Bool D.1992;
  _Bool D.1991;
  _Bool D.1990;
  int D.1989;

<bb 2>:
  D.1990_2 = a_1(D) != 0;
  D.1991_4 = b_3(D) != 3;
  D.1992_5 = D.1991_4 & D.1990_2;
  D.1989_6 = (int) D.1992_5;
  return D.1989_6;

}

So you see that by this, the SSA variable having _Bool type, as to be
wished, and not being handled as int.

Regards,
Kai