constantine/benchmarks/platforms.nim

31 lines
1.1 KiB
Nim
Raw Normal View History

# Constantine
# Copyright (c) 2018-2019 Status Research & Development GmbH
# Copyright (c) 2020-Present Mamy André-Ratsimbazafy
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
when defined(amd64): # TODO defined(i386) but it seems like RDTSC call is misconfigured
import platforms/x86
export getTicks, cpuName
const SupportsCPUName* = true
const SupportsGetTicks* = true
else:
const SupportsCPUName* = false
const SupportsGetTicks* = false
# Prevent compiler optimizing benchmark away
# -----------------------------------------------
# This doesn't always work unfortunately ...
proc volatilize(x: ptr byte) {.codegenDecl: "$# $#(char const volatile *x)", inline.} =
discard
template preventOptimAway*[T](x: var T) =
volatilize(cast[ptr byte](unsafeAddr x))
template preventOptimAway*[T](x: T) =
volatilize(cast[ptr byte](x))