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VFMSUB213PS

Performs a fused multiply-subtract operation on packed single-precision floating-point values. The instruction computes the result of (a * c) - b for each corresponding element of the input vectors, where the source operands are mapped as follows: the first operand is the multiplier, the second is the subtrahend, and the third is the multiplicand.

The following table specifies the supported source and destination operand types.

DO NOT support LOCK

This instruction is available only in 64-bit mode or compatibility mode. It requires the AVX support bit to be enabled in the CPU and the XMM registers must be used.

The operation is performed as a single rounding step; the product of the multiplier and multiplicand is not rounded before the subtraction of the subtrahend. This prevents intermediate precision loss and avoids the #P and #U exceptions that would otherwise occur during a separate multiply and subtract sequence. All operations are subject to the current MXCSR rounding mode and floating-point exception masks.