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Software Application Development ARM A-9  64-bit integer Multiply and Divide Instruction Timing
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Related

ARM A-9  64-bit integer Multiply and Divide Instruction Timing

Former Member
Former Member over 10 years ago

Hello,
I am benchmarking a simple algorithm with two multiplies on a Zedboard(7Z020) like shown below:
    Array2[j] = 1000 * Array1[i] * Array1[i+1];

The timers clock freq is 111.111115MHz = 9ns per clock cycle.

Does anyone know the ARM instruction timing(in clock cycles) for 64-bit integer multiply and Divide?

I'm getting the following results:
==================================
C Algorithm Used:
volatile int Array1[2100];
int Array2[1050], i, j;
for(i=0, j=0; i<2100; i+=2, j++)t
  Array2[j] = (int)((1000 * (long long)Array1[i]) * ((long long) Array1[i+1]));
 
Counter Ticks = 32
Time Taken = Counter Ticks * 9ns = 286(ns)

Software and Hardware Setup
===========================
My C program using the XScuTimer is like below:
{
    Counter_Register := 0xFFFFFFFF;
    Counter_Snapshot1 := Counter_Register;
    Start_XScuTimer();
    Algorithm;
    Stop_XScuTimer();
    Counter_Snapshot2 := Counter_Register  
    Counter_Ticks :=  Counter_Snapshot1 - Counter_Snapshot2;
    Time_Taken := Counter_Ticks * 9ns;
}

Software Environment for ARM Cortex A-9 CPU0
--------------------------------------------
xilinx-gcc compiler settings: -mfpu=vfpv3  -mfloat-abi=softfp -mcpu=cortex-a9 -march=armv7-a
Optimization Level -O3
     
Below are some of my FPGA clock configurations:
Peripheral              PLL source  Frequency (MHz)
---------------------------------------------------
CPU 6x Freq(MHz)        ARM PLL     666.666687 
UART Freq(MHz)          IO PLL      50.000000 
TTC0 CLK0 Freq(MHz)     CPU_1X      111.111115 
FPGA0 Freq(MHz)         IO PLL      100.000000 
FPGA1 Freq(MHz)         IO PLL      142.857132 
FPGA2 Freq(MHz)         IO PLL      50.000000 
FPGA3 Freq(MHz)         IO PLL      50.000000
DDR Operating Freq(MHz)             533.333313


Thanks in advance for looking at my issue.

Regards,
Vishal.

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