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Subject: [Bug rtl-optimization/17387] Redundant instructions in loop optimization
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------- Comment #19 from hjl at lucon dot org  2006-02-27 23:40 -------
Even with the new patch

http://gcc.gnu.org/ml/gcc-patches/2006-02/msg01994.html

I still got the same result. The new see pass won't touch

(insn:HI 13 9 14 2 (set (reg/v:SI 73 [ t ])
        (mem/s:SI (symbol_ref:DI ("state") [flags 0x40] <var_decl 0x2a98541420
state>) [3 state+0 S4 A32])) 40 {*movsi_1} (nil)
    (nil))

(insn:HI 14 13 16 2 (parallel [
            (set (reg/v:SI 73 [ t ])
                (xor:SI (mem/s:SI (symbol_ref:DI ("S") [flags 0x40] <var_decl
0x2a985412c0 S>) [3 S+0 S4 A32])
                    (reg/v:SI 73 [ t ])))
            (clobber (reg:CC 17 flags))
        ]) 340 {*xorsi_1} (insn_list:REG_DEP_TRUE 13 (nil))
    (expr_list:REG_UNUSED (reg:CC 17 flags)
        (expr_list:REG_EQUAL (xor:SI (mem/s:SI (symbol_ref:DI ("S") [flags
0x40] <var_decl 0x2a985412c0 S>) [3 S+0 S4 A32])
                (mem/s:SI (symbol_ref:DI ("state") [flags 0x40] <var_decl
0x2a98541420 state>) [3 state+0 S4 A32]))
            (nil))))

(insn:HI 16 14 18 2 (set (mem/s:SI (symbol_ref:DI ("state") [flags 0x40]
<var_decl 0x2a98541420 state>) [3 state+0 S4 A32])
        (reg/v:SI 73 [ t ])) 40 {*movsi_1} (insn_list:REG_DEP_TRUE 14 (nil))
    (nil))

(insn:HI 18 16 21 2 (set (reg:DI 79 [ t ])
        (zero_extend:DI (reg/v:SI 73 [ t ]))) 111 {zero_extendsidi2_rex64}
(nil)
    (expr_list:REG_DEAD (reg/v:SI 73 [ t ])
        (nil)))


-- 

hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|4.0.0                       |4.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17387