sysrap/tests/sbigint_test.sh

0001 #!/bin/bash -l
0002 usage(){ cat << EOU
0003 sbigint_test.sh
0004 ===================
0005
0006 A 32 step photon history can be represented
0007 by an 128 bit integer.  Unfortunately 64 bit
0008 is the largest size int thats in the C++ standard.
0009
0010 What operations are needed:
0011
0012 * count unique values in large array of int128
0013 * find indices of occurrences of a value in the array
0014
0015
0016
0017 :google:`std::vector of __int128`
0018
0019 https://codereview.stackexchange.com/questions/220809/128-bit-unsigned-integer
0020
0021 HMM: dealing with __int128 doesnt look easy
0022
0023
0024 https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+/HEAD/absl/numeric/int128.h
0025
0026 https://forums.swift.org/t/128-bit-operations-in-swift/21639/13
0027
0028 https://github.com/Jitsusama/UInt128
0029
0030
0031
0032 EOU
0033 }
0034
0035
0036 name=sbigint_test
0037
0038 TMP=${TMP:-/tmp/$USER/opticks}
0039 export FOLD=$TMP/$name
0040
0041 mkdir -p $FOLD
0042 bin=$FOLD/$name
0043
0044 gcc $name.cc -std=c++11 -lstdc++ -o $bin && $bin
0045
0046
0047