Intel Agilex® 7 Variable Precision DSP Blocks User Guide

ID 683037
Date 4/11/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents
Give Feedback

3.2.2.4. Sum of Two FP16 Multiplication with Accumulation Mode

This mode performs a summation of two half-precision multiplication and accumulate the value into single-precision format:

fp32_result(t) = [fp16_mult_top_a(t) * fp16_mult_top_b(t)] + [fp16_mult_bot_a(t) * fp16_mult_bot_b(t)] + fp32_result(t-1)

The following are exception flags supported in flushed and bfloat16 formats:
  • fp16_mult_top_invalid
  • fp16_mult_top_inexact
  • fp16_mult_top_overflow
  • fp16_mult_top_underflow
  • fp16_mult_bot_invalid
  • fp16_mult_bot_inexact
  • fp16_mult_bot_overflow
  • fp16_mult_bot_underflow
  • fp16_adder_invalid
  • fp16_adder_inexact
  • fp16_adder_overflow
  • fp16_adder_underflow
  • fp32_adder_invalid
  • fp32_adder_inexact
  • fp32_adder_overflow
  • fp32_adder_underflow
The following are exception flags supported in extended format:
  • fp16_mult_top_invalid
  • fp16_mult_top_inexact
  • fp16_mult_top_infinite
  • fp16_mult_top_zero
  • fp16_mult_bot_invalid
  • fp16_mult_bot_inexact
  • fp16_mult_bot_infinite
  • fp16_mult_bot_zero
  • fp16_adder_invalid
  • fp16_adder_inexact
  • fp16_adder_infinite
  • fp16_adder_zero
  • fp32_adder_invalid
  • fp32_adder_inexact
  • fp32_adder_overflow
  • fp32_adder_underflow
Figure 35. Sum of Two FP16 Multiplication with Accumulation Mode