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References: <bug-43175-682@http.gcc.gnu.org/bugzilla/>
Subject: [Bug target/43175] __builtin_ia32_vec_perm_v4si doesn't work with AVX
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------- Comment #3 from hjl dot tools at gmail dot com  2010-02-25 15:06 -------
We expand

D.3242_4 = __builtin_ia32_vec_perm_v4si (D.3241_3, D.3240_2, { 4, 1, 2, 3 });

into

(insn 27 24 28 3 x.i:22 (set (subreg:V8HI (reg:V4SI 75) 0)
        (vec_merge:V8HI (subreg:V8HI (reg:V4SI 75) 0)
            (subreg:V8HI (reg:V4SI 75) 0)
            (const_int 3 [0x3]))) -1 (nil))

(insn 28 27 29 3 x.i:22 (set (reg:V4SI 60 [ D.3242 ])
        (reg:V4SI 75)) -1 (nil))

But reg 75 is never set.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43175