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References: <bug-43147-18822@http.gcc.gnu.org/bugzilla/>
Subject: [Bug rtl-optimization/43147] SSE shuffle merge
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------- Comment #2 from pinskia at gcc dot gnu dot org  2010-02-23 01:42 -------
I think that is because nothing simplifies:
    (vec_select:V4SF (vec_concat:V8SF (vec_select:V4SF (vec_concat:V8SF
(reg:V4SF 62)
                    (reg:V4SF 62))
                (parallel [
                        (const_int 1 [0x1])
                        (const_int 2 [0x2])
                        (const_int 4 [0x4])
                        (const_int 7 [0x7])
                    ]))
            (vec_select:V4SF (vec_concat:V8SF (reg:V4SF 62)
                    (reg:V4SF 62))
                (parallel [
                        (const_int 1 [0x1])
                        (const_int 2 [0x2])
                        (const_int 4 [0x4])
                        (const_int 7 [0x7])
                    ])))
        (parallel [
                (const_int 1 [0x1])
                (const_int 3 [0x3])
                (const_int 6 [0x6])
                (const_int 4 [0x4])
            ]))


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43147