bench-stringop

#!/bin/bash

# Script to measure memset and memcpy for different sizes and strategies.
#
# Contributed by Jan Hubicka <jh@suse.cz>
#
# Copyright (C) 2019-2024 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING.  If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

# This script will search a line starting with 'spawn' that includes the
# pattern you are looking for (typically a source file name).
#
# Once it finds that pattern, it re-executes the whole command
# in the spawn line.  If the pattern matches more than one spawn
# command, it asks which one you want.

test()
{
rm -f a.out
cat <<END | $1 -x c -O3 $3 -DAVG_SIZE=$2 $STRINGOP -DMEMORY_COPIES=$memsize -
#define BUFFER_SIZE (16*1024*1024 + AVG_SIZE*2)
/*#define MEMORY_COPIES (1024*1024*64*(long long)10)*/
$type t[BUFFER_SIZE];
int main()
{
  unsigned int i;
  for (i=0;i<((long long)MEMORY_COPIES + AVG_SIZE * 2 - 1)/AVG_SIZE*2;i++)
#ifdef test_memset
    __builtin_memset (t+(i*1024*1024+i*1)%(BUFFER_SIZE - AVG_SIZE*2), i, (AVG_SIZE + i) % (AVG_SIZE * 2 + 0));
#else
    __builtin_memcpy (t+(i*1024*1024+i*1)%(BUFFER_SIZE - AVG_SIZE*2), t+((i+1)*1024*1024*4+i*1)%(BUFFER_SIZE - AVG_SIZE *2), (AVG_SIZE + i) % (AVG_SIZE * 2 + 0));
#endif
  return 0;
}
END
TIME=`/usr/bin/time -f "%E" ./a.out 2>&1`
echo -n " "$TIME
echo $TIME $4 >>/tmp/accum
}

test2()
{
rm -f a.out
cat <<END | clang -x c -O3 $3 -DAVG_SIZE=$2 $STRINGOP -DMEMORY_COPIES=$memsize 2>/dev/null -
#define BUFFER_SIZE (16*1024*1024 + AVG_SIZE*2)
/*#define MEMORY_COPIES (1024*1024*64*(long long)10)*/
$type t[BUFFER_SIZE];
int main()
{
  unsigned int i;
  for (i=0;i<((long long)MEMORY_COPIES + AVG_SIZE * 2 - 1)/AVG_SIZE*2;i++)
#ifdef test_memset
    __builtin_memset (t+(i*1024*1024+i*1)%(BUFFER_SIZE - AVG_SIZE*2), i, (AVG_SIZE + i) % (AVG_SIZE * 2 + 0));
#else
    __builtin_memcpy (t+(i*1024*1024+i*1)%(BUFFER_SIZE - AVG_SIZE*2), t+((i+1)*1024*1024*4+i*1)%(BUFFER_SIZE - AVG_SIZE *2), (AVG_SIZE + i) % (AVG_SIZE * 2 + 0));
#endif
  return 0;
}
END
TIME=`/usr/bin/time -f "%E" ./a.out 2>&1`
echo -n " "$TIME
echo $TIME $4 >>/tmp/accum
}

testrow()
{
echo -n "" >/tmp/accum
printf "%12i " $3
test "$2" "$3" "-mstringop-strategy=libcall" libcall
test "$2" "$3" "-mstringop-strategy=rep_byte -malign-stringops" rep1
test "$2" "$3" "-mstringop-strategy=rep_byte -mno-align-stringops" rep1noalign
test "$2" "$3" "-mstringop-strategy=rep_4byte -malign-stringops" rep4
test "$2" "$3" "-mstringop-strategy=rep_4byte -mno-align-stringops" rep4noalign
if [ "$mode" = 64 ]
then
test "$2" "$3" "-mstringop-strategy=rep_8byte -malign-stringops" rep8
test "$2" "$3" "-mstringop-strategy=rep_8byte -mno-align-stringops" rep8noalign
fi
test "$2" "$3" "-mstringop-strategy=loop -malign-stringops"  loop
test "$2" "$3" "-mstringop-strategy=loop -mno-align-stringops"  loopnoalign
test "$2" "$3" "-mstringop-strategy=unrolled_loop -malign-stringops" unrl
test "$2" "$3" "-mstringop-strategy=unrolled_loop -mno-align-stringops" unrlnoalign
test "$2" "$3" "-mstringop-strategy=vector_loop -malign-stringops" sse
test "$2" "$3" "-mstringop-strategy=vector_loop -mno-align-stringops -msse2" ssenoalign
#test2 "$2" "$3" "" 
test "$2" "$3" "-mstringop-strategy=byte_loop" byte
best=`cat /tmp/accum | sort | head -1`
test "$2" "$3" " -fprofile-generate" >/dev/null 2>&1
test "$2" "$3" " -fprofile-use"
test "$2" "$3" " -minline-stringops-dynamically"
echo "    $best"
}

test_all_sizes()
{
if [ "$mode" = 64 ]
then
echo "  block size  libcall rep1    noalg   rep4    noalg   rep8    noalg   loop    noalg   unrl    noalg   sse     noalg   byte    PGO     dynamic    BEST"
else
echo "  block size  libcall rep1    noalg   rep4    noalg   loop    noalg   unrl    noalg   sse     noalg   byte    PGO     dynamic    BEST"
fi
#for size in 1 2 3 4 6 8 10 12 14 16 24 32 48 64 128 256 512 1024 4096 8192 81920 819200 8192000
#for size in 8192000 819200 81920 8192 4096 2048 1024 512 256 128 64 48 32 24 16 14 12 10 8 6 5 4 3 2 1
for size in 8192000 819200 81920 20480 8192 4096 2048 1024 512 256 128 64 48 32 24 16 14 12 10 8 6 4 1
#for size in 128 256 1024 4096 8192 81920 819200
do
testrow "$1" "$2" $size
done
}

mode=$1
shift
export memsize=$1
shift
cmdline=$*
if [ "$mode" != 32 ]
then
  if [ "$mode" != 64 ]
  then
    echo "Usage:"
    echo "test_stringop mode size cmdline"
    echo "mode is either 32 or 64"
    echo "size is amount of memory copied in each test.  Should be chosed small enough so runtime is less than minute for each test and sorting works"
    echo "Example: test_stringop 32 640000000 ./xgcc -B ./ -march=pentium3"
    exit
  fi
fi

echo "memcpy"
export STRINGOP=""
type=char
test_all_sizes $mode "$cmdline -m$mode"
echo "Aligned"
type=long
test_all_sizes $mode "$cmdline -m$mode"
echo "memset"
export STRINGOP="-Dtest_memset=1"
type=char
test_all_sizes $mode "$cmdline -m$mode"
echo "Aligned"
type=long
test_all_sizes $mode "$cmdline -m$mode"