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Using the sqrt_fixed function provided for the ac_fixed data type in the Intel HLS compiler will result in an error when the HLS compiler is run if the input exceeds 32 bits.

Using the sqrt_fixed function provided for the ac_fixed data type in the Intel HLS compiler will result in an error when the HLS compiler is run if the input exceeds 32 bits.

  • Updated

<Quartus® Prime installation>\hls\include\HLS/ac_fixed_math.h file

//////////////////////////////
* Function Name Input Limit
* sqrt_fixed W <= 32, undefined behaviour for input value < 0
//// /////////////////////////

and that W (input) is specified to be used only up to 32 bits.

Therefore, when dealing with bit numbers larger than 32 bits, it is necessary to implement the square root calculation process by your own work instead of
sqrt_fixed.

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Category: HLS
Tools: Intel® HLS Compiler
Devices: -