This content has not been validated; it was AI-generated following the x86-64 ISA Documentation generation process to maintain high quality. However, as no human has verified this data, errors may exist. If the accuracy of this data is critical, please consult the Intel SDM. The model used to generate this is gemma4:31b

VFMSUB213PH

Performs a fused multiply-subtract operation on packed half-precision floating-point values. It computes the result of (a * b) - c for each corresponding element of the source operands.

The following table specifies the supported source and destination types.

DO NOT support LOCK

This instruction is available only in 64-bit mode or compatibility mode. It requires support for the AVX-512 FP16 extensions.

The operation is performed according to the IEEE 754-2008 standard for half-precision floating-point arithmetic. The intermediate product (a * b) is calculated with infinite precision before the subtraction of c occurs, avoiding an intermediate rounding step.

The result is subject to the rounding mode specified in the MXCSR register. The following floating-point exceptions may be triggered: #D, #O, #U, and #P. Memory operands are not supported for this instruction; operands MUST be provided in xmm or zmm registers.