[PATCH] Fix part of pr25505

Josh Conner jconner@apple.com
Thu Aug 31 18:02:00 GMT 2006

Daniel Berlin wrote:
>> if (VAR_DECL)
>>   check decl and subdecls for call-clobber
>> else
>>   { existing logic here }
>> How is that going to give strictly worse results?
> No, I mean that the the SSA_NAME logic that lives in "existing logic
> here" will give strictly worse results than it needs to,

Ahh - got it.  So you're suggesting that I fix the previous logic, too.
 I was a bit hesitant because I wasn't clear on what the LHS could be
that wasn't a "simple decl", and so I didn't feel confident rewriting
this portion.

So, IIUC you're recommending changing the "existing logic" to:

  FOR_EACH_SSA_DEF_OPERAND (def_p, stmt, op_iter, SSA_OP_ALL_DEFS)
      tree def = DEF_FROM_PTR (def_p);
      def = SSA_NAME_VAR (def);
      if (MTAG_P (def) && is_call_clobbered (def))
        goto unsafe;

OK with those changes if all tests pass?

- Josh

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