#!/bin/bash
# shellcheck disable=SC2034 #  'ut' and 'idl' appears unused.

looptime=.2
declare -i i int cnt

printf -v looptime %0.9f "$looptime"
shopt -s extglob
sltime=${looptime%%*(0)}; sltime=${sltime#0}
looptime=${looptime/.}; looptime=${looptime##*(0)}
shopt -u extglob

read -r exe < <(readlink /proc/$$/exe); exe=${exe#$PWD/}

optime() { # Compute time per operation in musec.
    if [[ "$cnt" ]] ;then
	local string=00000$(( ( looptime * 1000 / $1 )-(looptime*1000/cnt)))
    else local string=00000$(( looptime * 1000 / $1 )) ;fi
    printf -v "$2" '%.2f' ${string::-6}.${string: -6}
    printf ' - %s: %11s...\r' "${BASH_LINENO[0]}" "${!2}" >&2
}
trap break usr2; exec {dummy}<> <( : )
timed() { read -rt $sltime -u "$dummy" _; kill -USR2 $$; }

timed & for ((i=0;++i;)){ :				;};optime "$i" inctm
cnt=$i
timed & for ((i=0;++i;)){ : {0..999}			;};optime "$i" ass1k 
timed & for ((i=0;++i;)){ : {0..9}{0..9}{0..9}		;};optime "$i" ass1dx3
timed & for ((i=0;++i;)){ read -r ut idl </proc/uptime	;};optime "$i" readut
timed & for ((i=0;++i;)){ [[ $cnt =~ ^[0-9]*\..*$ ]]	;};optime "$i" re
timed & for ((i=0;++i;)){ : <<<"Hello world!"		;};optime "$i" instr
timed & for ((i=0;++i;)){ int+=1			;};optime "$i" intinc
timed & for ((i=0;++i;)){ : "$EPOCHREALTIME" 		;};optime "$i" art
timed & for ((i=0;++i;)){ printf -v int '%s+%s' $int 1	;};optime "$i" prtf

if [[ "$*" != *"-q"* ]];then
    ar=("l/${sltime}s" '{0..999}' '3x{0..9}' readUt RE InLneStr IncInt
	AccessRt PrintF Version BuildDir)
    paste <(printf " - %-12s\n" "${ar[@]:1:${#ar[@]}-3}") <(
	sed <"$0" -ne 's/^timed.*{ \(..\+[^\o11]\)\o11*;}.*/\1/p')
    printf '%11s %11s %11s %11s %11s %11s %11s %11s %11s  %-18s %s\n' "${ar[@]}"
fi
# shellcheck disable=SC2154 # referenced but not assigned
printf '%11d %11s %11s %11s %11s %11s %11s %11s %11s  %-18s %s\n' \
       "$cnt" "$ass1k" "$ass1dx3" "$readut" "$re" "$instr" "$intinc" "$prtf" \
       "$art" "$BASH_VERSION" "${exe#$PWD/}"