[Bug target/93594] Missed optimization with _mm256_set/setr_m128i intrinsics

[andysem at mail dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93594

--- Comment #3 from andysem at mail dot ru ---
...and probably other permute variants involving zeroed input registers, e.g.:

__m256i cvt_permute_zero_v1(__m128i low)
{
    return _mm256_permute2x128_si256(_mm256_setzero_si256(),
_mm256_castsi128_si256(low), 0x02);
}

__m256i cvt_permute_zero_v2(__m128i low)
{
    return _mm256_permute2x128_si256(_mm256_castsi128_si256(low),
_mm256_setzero_si256(), 0x20);
}

https://gcc.godbolt.org/z/Zpo9K7