https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96480

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That commit changes the pre-reassoc2 dump like:
--- pr96480.ii.172t.printf-return-value2_       2020-08-05 07:22:42.000000000
-0400
+++ pr96480.ii.172t.printf-return-value2        2020-08-05 07:23:32.000000000
-0400
@@ -31,13 +31,13 @@ bool is_foo(ENUM) (ENUM e)

   <bb 5> [12.87%]:
   if (e_2(D) == 3)
-    goto <bb 7> (<L4>); [3.00%]
+    goto <bb 6>; [3.00%]
   else
-    goto <bb 6>; [97.00%]
+    goto <bb 7> (<L4>); [97.00%]

-  <bb 6> [12.48%]:
+  <bb 6> [0.39%]:

-  # prephitmp_5 = PHI <1(2), 1(3), 1(4), 1(5), 0(6)>
+  # prephitmp_5 = PHI <1(2), 1(3), 1(4), 1(6), 0(5)>
 <L4> [14.13%]:
   return prephitmp_5;

So I guess I need to debug why reassoc doesn't like that form.

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