nim-stint/benchmarks/bench_mod.nim

56 lines
1.2 KiB
Nim

import ../stint, times
# Warmup on normal int
var start = cpuTime()
block:
var foo = 123
for i in 0 ..< 10_000_000:
foo += i*i mod 456
foo = foo mod 789
# Compiler shouldn't optimize away the results as cpuTime rely on sideeffects
var stop = cpuTime()
echo "Warmup: " & $(stop - start) & "s"
####################################
start = cpuTime()
block:
var foo = 123.u256
for i in 0 ..< 10_000_000:
foo += i.u256 * i.u256 mod 456.u256
foo = foo mod 789.u256
stop = cpuTime()
echo "Library: " & $(stop - start) & "s"
when defined(bench_ttmath):
# need C++
import ttmath
template tt_u256(a: int): UInt[256] = ttmath.u256(a.uint)
start = cpuTime()
block:
var foo = 123.tt_u256
for i in 0 ..< 10_000_000:
foo += i.tt_u256 * i.tt_u256 mod 456.tt_u256
foo = foo mod 789.tt_u256
stop = cpuTime()
echo "TTMath: " & $(stop - start) & "s"
# On my i5-5257 broadwell with the flags:
# nim c -d:release -d:bench_ttmath
# Warmup: 0.04060799999999999s
# Library: 0.9576759999999999s
# TTMath: 0.758443s
# After PR #54 for compile-time evaluation
# which includes loop unrolling but may bloat the code
# Warmup: 0.03993500000000001s
# Library: 0.848464s