>       PR rtl-optimization/50448
>       * cprop.c (try_replace_reg): Try to simplify SET_SRC given the
>       substitution.

The whole patch is about SET_DEST though, so I'm a little confused.  And the 
head comment of try_replace_reg reads:

/* Try to replace all non-SET_DEST occurrences of FROM in INSN with TO.
   Returns nonzero is successful.  */

so I'm not sure this is the right place to fiddle with SET_DEST.

-- 
Eric Botcazou

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