- Download Intel Pin. Our pintool is tested with Pin 3.17.
# Download this repo
git clone https://github.com/COSys-Research/Fixed-Posit.git
# Copy the pintools folder inside Pin's tools folder
# $PIN_HOME is set to the root directot of Intel Pin
cp -r Fixed-Posit/pintool/ $(PIN_HOME)/source/tools/
#Build the fixedpositmul pintool
cd $(PIN_HOME)/source/tools/pintool
make
# This would create a obj-intel64 or obj-ia32 folder with fixedpositmul.so file depending on your machine's architecture.After building you can use the pintools in the same way any other pintool is used. For a 64 bit machine, the coomand would be as follows:
$(PIN_HOME)/pin -t $(PIN_HOME)/source/tools/pintools/obj-intel64/fixedpositmul.so -n 32 -e 6 -r 2 -l 1 -o operandlog.out -- <path_to_app>The pintool has 5 arguments:
- n : To specify the bit-width of the fixed-posit (default: 32)
- e : To specify exponent size of fixed-posit (default: 6)
- r : To specify regime size of fixed-posit (default: 2)
- l : To specify wheter to log the multiplication operands or not (default: 0). For this argument, 1 means log, 0 means don't log.
- o : To specify the name of log file if we want to log the multiplication operands (default: operandlog.out)
- This tool is made for single-threaded workloads only<operand_1> <operand_2> <product of operand_1 and operand_2>
All numbers of the trace are in single precision IEEE-754 format (type float)
The analysis routine of this pintool is posit_multiply. The routine takes in the operands of multiplications having type float.
It then converts the operands into fixed-posit format of the specified configuration and perform fixed-posit multiplication.
Finally it converts the result of multiplication back into type float and returns it.