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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107432] __builtin_convertvector generates inefficient
 code
Date: Fri, 28 Oct 2022 03:33:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107432

--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
typedef int v4si __attribute__((vector_size(16)));
typedef long long v4di __attribute__((vector_size(32)));

v4si
foo (v4di a)
{
    return __builtin_convertvector (a, v4si);
}

hmm, we actually support truncv4div4si2, but some how gcc failed to generate
.VEC_CONVERT with truncmn2.

hmm, what's optab for convert_optab_handler?=