[Bug middle-end/49721] convert_memory_address_addr_space may generate invalid new insns

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49721

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-28 21:27:33 
UTC ---
The question is we have

(zero_extend:DI (plus:SI (FOO:SI) (const_int Y)))

Is is OK to transform it to

(plus:DI (zero_extend:DI (FOO:SI)) (const_int Y))

The current convert_memory_address_addr_space does
transformation if Y > 0. It makes no sense not to
transform it if Y < 0.