[Bug rtl-optimization/105338] [12 Regression] Regression: jump or cmove generated for pattern (x ? CST : 0)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105338

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r12-7687-g3a7ba8fd0cda387809e4902328af2473662b6a4a
All the *.optimized dump differences with that change look like:
@@ -8,14 +8,14 @@ int f (int i)

   <bb 2> [local count: 1073741824]:
   if (i_2(D) != 0)
-    goto <bb 4>; [35.00%]
+    goto <bb 3>; [35.00%]
   else
-    goto <bb 3>; [65.00%]
+    goto <bb 4>; [65.00%]

-  <bb 3> [local count: 697932184]:
+  <bb 3> [local count: 375809640]:

   <bb 4> [local count: 1073741824]:
-  # iftmp.0_1 = PHI <5(2), i_2(D)(3)>
+  # iftmp.0_1 = PHI <5(3), i_2(D)(2)>
   return iftmp.0_1;

 }

i.e. swapping whether true or false edge goes through the empty bb.  Wonder why
we emit different code based on that...