[llvm-bugs] [Bug 32839] New: [X86] Missing _mm256_zextpd128_pd256 et al. helper intrinsics

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https://bugs.llvm.org/show_bug.cgi?id=32839

            Bug ID: 32839
           Summary: [X86] Missing _mm256_zextpd128_pd256 et al. helper
                    intrinsics
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org

ICC provides these helper intrinsics that are similar to their
'_mm256_castpd128_pd256' etc. siblings but guarantee zero extension of the
upper vector lanes.

avxintrin.h:
__m256d _mm256_zextpd128_pd256 (__m128d a)
__m256 _mm256_zextps128_ps256 (__m128 a)
__m256i _mm256_zextsi128_si256 (__m128i a)

avx512fintrin.h:
__m512d _mm512_zextpd128_pd512 (__m128d a)
__m512d _mm512_zextpd256_pd512 (__m256d a)
__m512 _mm512_zextps128_ps512 (__m128 a)
__m512 _mm512_zextps256_ps512 (__m256 a)
__m512i _mm512_zextsi128_si512 (__m128i a)
__m512i _mm512_zextsi256_si512 (__m256i a)

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