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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103897] x86: Missing optimizations with
 _mm_undefined_si128 and PMOVSX*
Date: Tue, 04 Jan 2022 03:08:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103897

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
For 2), it seems to be a generic optimization to optimize

(set (mem:V4SI (reg:DI 95) [0 *dst_7(D)+0 S16 A128])
    (ashiftrt:V4SI (subreg:V4SI (vec_select:V8HI (vec_concat:V16HI
(const_vector:V8HI [
                            (const_int 0 [0]) repeated x8
                        ])
                    (mem:V8HI (reg:DI 96) [0 *src_3(D)+0 S16 A128]))
                (parallel [
                        (const_int 0 [0])
                        (const_int 8 [0x8])
                        (const_int 1 [0x1])
                        (const_int 9 [0x9])
                        (const_int 2 [0x2])
                        (const_int 10 [0xa])
                        (const_int 3 [0x3])
                        (const_int 11 [0xb])
                    ])) 0)
        (const_int 16 [0x10])))


to sign_extend of (mem:V8HI (reg:DI 96)=