[Bug target/22432] [4.0/4.1 Regression] Wrong code generation using MMX intrinsics on amd64

[steven at gcc dot gnu dot org]

------- Comment #6 from steven at gcc dot gnu dot org  2005-11-04 23:17 -------
In the .life1 dump we have:

(insn 41 38 42 2 (set (reg:V2SI 79 [ D.2609 ])
        (subreg:V2SI (reg:V8QI 76) 0)) 998 {*movv2si_internal_rex64 
    (insn_list:REG_DEP_TRUE 32 (nil))
        (expr_list:REG_DEAD (reg:V8QI 76)
            (nil)))

(insn 42 41 43 2 (set (reg:V2SI 80 [ D.2619 ])
        (subreg:V2SI (reg:V8QI 78) 0)) 998 {*movv2si_internal_rex64} 
    (insn_list:REG_DEP_TRUE 38 (nil))
        (expr_list:REG_DEAD (reg:V8QI 78)
            (nil)))

(insn 43 42 46 2 (set (reg:V4HI 81)
        (plus:V4HI (subreg:V4HI (reg:V2SI 79 [ D.2609 ]) 0)
            (subreg:V4HI (reg:V2SI 80 [ D.2619 ]) 0))) 1031 {mmx_addv4hi3} 
    (insn_list:REG_DEP_TRUE 41 (insn_list:REG_DEP_TRUE 42 (nil)))
        (expr_list:REG_DEAD (reg:V2SI 79 [ D.2609 ])
            (expr_list:REG_DEAD (reg:V2SI 80 [ D.2619 ])
                (nil))))



After combine we have:
(note 41 38 42 2 NOTE_INSN_DELETED)

(note 42 41 43 2 NOTE_INSN_DELETED)

(insn 43 42 46 2 (set (reg:V8QI 81)
        (plus:V8QI (reg:V8QI 76)
            (reg:V8QI 78))) 1030 {mmx_addv8qi3}
    (insn_list:REG_DEP_TRUE 38 (insn_list:REG_DEP_TRUE 32 (nil)))
        (expr_list:REG_DEAD (reg:V8QI 78)
            (expr_list:REG_DEAD (reg:V8QI 76)
                (nil))))

Is that really the same???


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22432