[Bug rtl-optimization/49088] Combine fails to properly handle zero-extension and signed int constant

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49088

H.J. Lu <hjl.tools at gmail dot com> changed:

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--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> 2011-05-21 13:25:10 
UTC ---
Created attachment 24318
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24318
A new patch

For binary operations, if X is narrower than MODE and we want all
the bits in X's mode, just use the operand when it is CONST_INT.