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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/10050] ifcvt is not smart enough
Date: Fri, 26 May 2023 01:01:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D10050

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |middle-end

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note for func2 we get:

  if (flag.0_2 !=3D 0)
    goto <bb 4>; [50.00%]
  else
    goto <bb 3>; [50.00%]

  <bb 3> [local count: 536870912]:
  pretmp_18 =3D *a_10(D);
  pretmp_20 =3D MEM[(int *)a_10(D) + 4B];
  goto <bb 5>; [100.00%]

  <bb 4> [local count: 536870913]:
  *a_10(D) =3D _9;
  MEM[(int *)a_10(D) + 4B] =3D _1;

  <bb 5> [local count: 1073741824]:
  # prephitmp_19 =3D PHI <pretmp_18(3), _9(4)>
  # prephitmp_21 =3D PHI <pretmp_20(3), _1(4)>

the conditional stores are correct if not supplying -fallow-store-data-race=
s .=20
Now GCC does not optimize this even with -fallow-store-data-races but maybe=
 it
could.=