x86-64.net

Instruction

VBCSTNESH2PS

Loads one half-precision value from memory, converts it to single precision and broadcasts it to every element, without floating-point exceptions.

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

Forms

Every encoding of VBCSTNESH2PS that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
VBCSTNESH2PS xmm, m16 VBCSTNESH2PS_XMMf32_MEMf16VEX.128.66.0F38.W0 B1 /rAVX_NE_CONVERT
VBCSTNESH2PS ymm, m16 VBCSTNESH2PS_YMMf32_MEMf16VEX.256.66.0F38.W0 B1 /rAVX_NE_CONVERT

Intrinsics

The C intrinsics of Clang 23.1.2 that compile to VBCSTNESH2PS, 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_bcstnesh_ps __m128 _mm_bcstnesh_ps(const void *__A)

VBCSTNESH2PS xmm, m16 VEX.128 -mavxneconvert

_mm256_bcstnesh_ps __m256 _mm256_bcstnesh_ps(const void *__A)

VBCSTNESH2PS ymm, m16 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.