[Bug target/50131] Optimize x = -1 with "or" for -O

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50131

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

           What    |Removed                     |Added
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                 CC|                            |sergos.gnu at gmail dot com

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-23 14:38:58 
UTC ---
We do have

  /* X86_TUNE_MOVE_M1_VIA_OR: On pentiums, it is faster to load -1 via OR
     than a MOV.  */
  m_PENT,

We should check how it performs on the current processors.