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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110711] possible missed optimization for std::max
 with -march=znver2
Date: Wed, 19 Jul 2023 08:41:43 +0000
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X-Bugzilla-Component: middle-end
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X-Bugzilla-Keywords: missed-optimization, openmp
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110711

--- Comment #7 from Hongtao.liu <crazylht at gmail dot com> ---
git diff gcc12_171t.ifcvt gcc13.173.ifcvt

   <bb 5> [local count: 955630227]:
-  # i_22 =3D PHI <i_16(10), 1(19)>
+  # i_21 =3D PHI <i_16(10), 1(19)>
   # prephitmp_19 =3D PHI <prephitmp_24(10), _1(19)>
-  _2 =3D i_22 * 8;
+  _2 =3D i_21 * 8;
   _3 =3D a_10(D) + _2;
   _17 =3D MEM[(const double &)_3];
-  prephitmp_24 =3D MAX_EXPR <_17, prephitmp_19>;
-  i_16 =3D i_22 + 1;
+  _29 =3D MAX_EXPR <_17, prephitmp_19>;
+  prephitmp_24 =3D _29;
+  i_16 =3D i_21 + 1;
   if (n_els_7(D) > i_16)
     goto <bb 10>; [89.00%]
   else
     goto <bb 13>; [11.00%]

   <bb 13> [local count: 105119324]:
-  # prephitmp_13 =3D PHI <prephitmp_24(5), prephitmp_12(16)>
+  # prephitmp_15 =3D PHI <_29(5), prephitmp_27(16)>
   goto <bb 8>; [100.00%]=