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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-20 08:32:12 UTC ---
Is or $-1, reg on all CPUs equally expensive to mov $-1, reg though (as or
generally needs the previous reg content while mov does not; I know some CPUs
special case xor reg, reg, but I doubt or $-1, reg is special cased)?