x86-64.net

Instruction

VFMSUB132SH

Fused multiply-subtract of the low half-precision values: first times third minus second, into the first; the rest is unchanged.

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

Forms

Every encoding of VFMSUB132SH that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
VFMSUB132SH xmm {k}{z}, xmm, xmm, {er} VFMSUB132SH_XMMf16_MASKmskw_XMMf16_XMMf16_AVX512EVEX.LIG.66.MAP6.W0 9B /rAVX10.1 or AVX512_FP16
VFMSUB132SH xmm {k}{z}, xmm, m16 VFMSUB132SH_XMMf16_MASKmskw_XMMf16_MEMf16_AVX512EVEX.LIG.66.MAP6.W0 9B /rAVX10.1 or AVX512_FP16

Intrinsics

The C intrinsics of Clang 23.1.2 that compile to VFMSUB132SH, 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_fmsub_sh __m128h _mm_fmsub_sh(__m128h __W, __m128h __A, __m128h __B)

VFMSUB132SH xmm, xmm, m16 EVEX.LIG -mavx512fp16when __A comes from memory

_mm_mask_fmsub_sh __m128h _mm_mask_fmsub_sh(__m128h __W, __mmask8 __U, __m128h __A, __m128h __B)

VFMSUB132SH xmm {k}, xmm, m16 EVEX.LIG -mavx512fp16when __A comes from memory

_mm_maskz_fmsub_sh __m128h _mm_maskz_fmsub_sh(__mmask8 __U, __m128h __A, __m128h __B, __m128h __C)

VFMSUB132SH xmm {k}{z}, xmm, m16 EVEX.LIG -mavx512fp16when __B comes from memory

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
AVX512_FP16_SCALAR

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

or

AVX512_FP16
CPUID.(EAX=07H,ECX=0):EDX[23] AVX512_FP16

Nova Lake, 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.