[Bug rtl-optimization/50696] [x32] Unnecessary lea

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50696

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> 2011-10-11 22:13:47 UTC ---
const_32bit_mask is incorrect since combine may optimize VAL
in ADDR & VAL from 0xffffffff to 0xfffffffc.  Even if we take
this into account, we can't decompose

(plus:DI (subreg:DI (mult:SI (reg/v:SI 85 [ i ])
            (const_int 4 [0x4])) 0)
    (subreg:DI (reg:SI 100) 0))