[Bug target/50603] [x32] Unnecessary lea

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50603

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> 2011-10-06 19:19:23 
UTC ---
Combine failed:

(set (mem:SI (and:DI (plus:DI (subreg:DI (mult:SI (reg/v:SI 84 [ i ])
                        (const_int 4 [0x4])) 0)
                (subreg:DI (reg:SI 106) 0)) 
            (const_int 4294967292 [0xfffffffc])) [3 MEM[symbol: x, index:
D.2741_12, step: 4, offset: 4294967292B]+0 S4 A32])
    (reg/v:SI 84 [ i ])) 

for

(insn 37 35 39 3 (set (reg:SI 90)
        (plus:SI (mult:SI (reg/v:SI 84 [ i ])
                (const_int 4 [0x4]))
            (reg:SI 106))) x.i:11 247 {*leasi_2}
     (nil))

(insn 39 37 41 3 (set (mem:SI (zero_extend:DI (reg:SI 90)) [3 MEM[symbol: x,
index: D.2741_12, step: 4, offset: 4294967292B]+0 S4 A32])
        (reg/v:SI 84 [ i ])) x.i:11 64 {*movsi_internal}
     (expr_list:REG_DEAD (reg:SI 90)
        (nil)))

Since address is 32bit aligned, 0xfffffffc is the same as
0xffffffff.  But we don't have this information.