Meaning of MODIFY_EXPR? (Affects g77, maybe others....)

[Mark Mitchell]

Craig --

  The ability of the compiler to assume non-overlapping copies should
be implicit in MODIFY_EXPR.  This allows for more optimization in C,
and that is important.  As you make clear, changing the meaning of
MODIFY_EXPR would be like changing all memcpys to memmoves;
potentially costly.

  I suggest we take the alternative of fixing the MODIFY_EXPR
documentation to reflect its current semantics, and then that you take
the step of modifying g77 as appropriate.

  Easy for me to say.

-- 
Mark Mitchell                   mark@codesourcery.com
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