[Bug middle-end/16802] PowerPC - Unnecessary extsw

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-08 13:49 -------
Fixed on the mainline.
We now combine the following RTL to fix the problem:
(insn 16 15 17 0 (set (reg:SI 126)
        (lt:SI (reg:CC 127)
            (const_int 0 [0x0]))) 382 {*rs6000.md:11380} (insn_list:REG_DEP_TRUE 15 (nil))
    (expr_list:REG_DEAD (reg:CC 127)
        (nil)))

(insn 17 16 21 0 (set (reg:DI 128)
        (sign_extend:DI (reg:SI 126))) 43 {*rs6000.md:446} (insn_list:REG_DEP_TRUE 16 (nil))
    (expr_list:REG_DEAD (reg:SI 126)
        (nil)))
(insn 24 21 30 0 (set (reg/i:DI 3 r3 [ <result> ])
        (reg:DI 128)) 312 {*movdi_internal64} (insn_list:REG_DEP_TRUE 17 (nil))
    (expr_list:REG_DEAD (reg:DI 128)
        (nil)))
Into:
(insn 24 21 30 0 (set (reg/i:DI 3 r3 [ <result> ])
        (lt:DI (reg:CC 127)
            (const_int 0 [0x0]))) 383 {*rs6000.md:11412} (insn_list:REG_DEP_TRUE 15 (nil))
    (expr_list:REG_DEAD (reg:CC 127)
        (nil)))


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16802