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Re: [PATCH] add recognizing to cse_change_cc_mode

+   /* If the following assertion was triggered, there is most probably
+      something wrong with the cc_modes_compatible back end function.
+      CC modes only can be considered compatible if the insn - with the mode
+      replaced by any of the compatible modes - can still be recognized.  */
+   gcc_assert (apply_change_group ());
+ }

This is wrong, you want

  int success;
  ...

  success = apply_change_group ();
  gcc_assert (success);

Paolo

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