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The Fused Multiply-Add extension optionally extends the VFPv3 architecture.
It provides VFP instructions that perform multiply and accumulate operations with a single rounding step, so suffers from less loss of accuracy than performing a multiplication followed by an add.
The fused multiply-add instructions are only available on VFP systems that implement the fused multiply-add extension. The VFP system that implements the fused multiply-add extension is VFPv4.