x86-64.net

Instruction

VMOVSHDUP

Duplicates each odd-numbered single into the even position below it.

Extensions
Forms
10 (4 VEX, 6 EVEX)
Data
Intel XED v2026.08.23

Forms

Every encoding of VMOVSHDUP that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
VMOVSHDUP xmm, m128 VMOVSHDUP_XMMdq_MEMdqVEX.128.F3.0F.WIG 16 /rAVX
VMOVSHDUP xmm, xmm VMOVSHDUP_XMMdq_XMMdqVEX.128.F3.0F.WIG 16 /rAVX
VMOVSHDUP ymm, m256 VMOVSHDUP_YMMqq_MEMqqVEX.256.F3.0F.WIG 16 /rAVX
VMOVSHDUP ymm, ymm VMOVSHDUP_YMMqq_YMMqqVEX.256.F3.0F.WIG 16 /rAVX
VMOVSHDUP zmm {k}{z}, zmm VMOVSHDUP_ZMMf32_MASKmskw_ZMMf32_AVX512EVEX.512.F3.0F.W0 16 /rAVX10.1 or AVX512F
VMOVSHDUP zmm {k}{z}, m512 VMOVSHDUP_ZMMf32_MASKmskw_MEMf32_AVX512EVEX.512.F3.0F.W0 16 /rAVX10.1 or AVX512F
VMOVSHDUP xmm {k}{z}, xmm VMOVSHDUP_XMMf32_MASKmskw_XMMf32_AVX512EVEX.128.F3.0F.W0 16 /rAVX10.1 or AVX512F + AVX512VL
VMOVSHDUP xmm {k}{z}, m128 VMOVSHDUP_XMMf32_MASKmskw_MEMf32_AVX512EVEX.128.F3.0F.W0 16 /rAVX10.1 or AVX512F + AVX512VL
VMOVSHDUP ymm {k}{z}, ymm VMOVSHDUP_YMMf32_MASKmskw_YMMf32_AVX512EVEX.256.F3.0F.W0 16 /rAVX10.1 or AVX512F + AVX512VL
VMOVSHDUP ymm {k}{z}, m256 VMOVSHDUP_YMMf32_MASKmskw_MEMf32_AVX512EVEX.256.F3.0F.W0 16 /rAVX10.1 or AVX512F + AVX512VL

Intrinsics

The C intrinsics of Clang 23.1.2 that compile to VMOVSHDUP, each with the form it compiles to and the Clang options it needs. The forms come from compiling every intrinsic and decoding the result with Intel XED; all intrinsics A–Z explains the method.

IntrinsicCompiles to
_mm_movehdup_ps __m128 _mm_movehdup_ps(__m128 __a)

VMOVSHDUP xmm, xmm VEX.128 -mavxwith AVX enabled

_mm_mask_movehdup_ps __m128 _mm_mask_movehdup_ps(__m128 __W, __mmask8 __U, __m128 __A)

VMOVSHDUP xmm {k}, xmm EVEX.128 -mavx512vl

_mm_maskz_movehdup_ps __m128 _mm_maskz_movehdup_ps(__mmask8 __U, __m128 __A)

VMOVSHDUP xmm {k}{z}, xmm EVEX.128 -mavx512vl

_mm256_movehdup_ps __m256 _mm256_movehdup_ps(__m256 __a)

VMOVSHDUP ymm, ymm VEX.256 -mavx

_mm256_mask_movehdup_ps __m256 _mm256_mask_movehdup_ps(__m256 __W, __mmask8 __U, __m256 __A)

VMOVSHDUP ymm {k}, ymm EVEX.256 -mavx512vl

_mm256_maskz_movehdup_ps __m256 _mm256_maskz_movehdup_ps(__mmask8 __U, __m256 __A)

VMOVSHDUP ymm {k}{z}, ymm EVEX.256 -mavx512vl

_mm512_movehdup_ps __m512 _mm512_movehdup_ps(__m512 __A)

VMOVSHDUP zmm, zmm EVEX.512 -mavx512f

_mm512_mask_movehdup_ps __m512 _mm512_mask_movehdup_ps(__m512 __W, __mmask16 __U, __m512 __A)

VMOVSHDUP zmm {k}, zmm EVEX.512 -mavx512f

_mm512_maskz_movehdup_ps __m512 _mm512_maskz_movehdup_ps(__mmask16 __U, __m512 __A)

VMOVSHDUP zmm {k}{z}, zmm EVEX.512 -mavx512f

CPUID and processors

Each form belongs to an XED ISA set. A form can be used when the processor reports every CPUID bit of one of its ISA set's alternatives.

CPUID requirements and processors of the XED ISA sets above. Alternatives are separated by “or”; processors follow XED’s chip model, which covers AMD processors up to Zen 2.
ISA setCPUIDProcessors in XED
AVX

AVX
CPUID.01H:ECX[28] AVX

Sandy Bridge, Ivy Bridge, Haswell, Broadwell, Skylake, Comet Lake, Cannon Lake, Ice Lake (client), Tiger Lake, Alder Lake, Arrow Lake, Panther Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Sierra Forest, Clearwater Forest, Knights Landing, Knights Mill, Bulldozer, Piledriver, Zen, Zen+, Zen 2
AVX512F_512

AVX10.1
CPUID.(EAX=07H,ECX=1):EDX[19] AVX10
CPUID.(EAX=24H,ECX=0):EBX[7:0] ≥ 1 AVX10 version

or

AVX512F
CPUID.(EAX=07H,ECX=0):EBX[16] AVX512F

Cannon Lake, Ice Lake (client), Tiger Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Knights Landing, Knights Mill
AVX512F_128

AVX10.1
CPUID.(EAX=07H,ECX=1):EDX[19] AVX10
CPUID.(EAX=24H,ECX=0):EBX[7:0] ≥ 1 AVX10 version

or

AVX512F + AVX512VL
CPUID.(EAX=07H,ECX=0):EBX[16] AVX512F
CPUID.(EAX=07H,ECX=0):EBX[31] AVX512VL

Cannon Lake, Ice Lake (client), Tiger Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids
AVX512F_256

AVX10.1
CPUID.(EAX=07H,ECX=1):EDX[19] AVX10
CPUID.(EAX=24H,ECX=0):EBX[7:0] ≥ 1 AVX10 version

or

AVX512F + AVX512VL
CPUID.(EAX=07H,ECX=0):EBX[16] AVX512F
CPUID.(EAX=07H,ECX=0):EBX[31] AVX512VL

Cannon Lake, Ice Lake (client), Tiger Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids

More AVX10.1 instructions

All 686 AVX10.1 instructions

Sources

  1. Intel XED v2026.08.23 (commit 0bcb6237345c): forms, encodings, ISA sets, CPUID bits and chip model.
  2. Clang's x86 intrinsic headers, LLVM 23.1.2 (commit 85ac56026243): the intrinsics, their signatures and doc comments, and the Clang of that release, which compiled each of them.
  3. Intel Advanced Vector Extensions 10.2 Architecture Specification, revision 6.0 (361050-006, January 2026)

The tables are derived from Intel XED, Copyright Intel Corporation, licensed under the Apache License 2.0; x86-64.net converted and reformatted them. The intrinsics and their signatures come from Clang, part of the LLVM Project, licensed under the Apache License 2.0 with LLVM Exceptions. The text is our own.