x86-64.net

Instruction

VCVTNEEPH2PS

Converts the even-numbered half-precision values of a memory operand to single precision, without floating-point exceptions.

Extensions
Forms
2 (2 VEX)
Data
Intel XED v2026.08.23

Forms

Every encoding of VCVTNEEPH2PS that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
VCVTNEEPH2PS xmm, m128 VCVTNEEPH2PS_XMMf32_MEM2f16VEX.128.66.0F38.W0 B0 /rAVX_NE_CONVERT
VCVTNEEPH2PS ymm, m256 VCVTNEEPH2PS_YMMf32_MEM2f16VEX.256.66.0F38.W0 B0 /rAVX_NE_CONVERT

Intrinsics

The C intrinsics of Clang 23.1.2 that compile to VCVTNEEPH2PS, 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_cvtneeph_ps __m128 _mm_cvtneeph_ps(const __m128h *__A)

VCVTNEEPH2PS xmm, m128 VEX.128 -mavxneconvert

_mm256_cvtneeph_ps __m256 _mm256_cvtneeph_ps(const __m256h *__A)

VCVTNEEPH2PS ymm, m256 VEX.256 -mavxneconvert

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_NE_CONVERT

AVX_NE_CONVERT
CPUID.(EAX=07H,ECX=1):EDX[5] AVX_NE_CONVERT

Arrow Lake, Panther Lake, Nova Lake, Diamond Rapids, Sierra Forest, Clearwater Forest

More AVX-NE-CONVERT 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 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-092, June 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.