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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file parc_TimingIntel.h
* @ingroup developer
* @brief Macros for timing code
*
* This code uses the Intel recommended benchmarking techniques described
* in the whitepaper "How to Benchmakr Code Execution Times on Intel (R) IA-32 and
* IA-64 Instruction Set Architectures" available at:
*
* http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/ia-32-ia-64-benchmark-code-execution-paper.pdf
*
*
*/
#ifndef libparc_parc_TimingIntel_h
#define libparc_parc_TimingIntel_h
#ifdef PARCTIMING_INTEL
#include <stdint.h>
#include <stdbool.h>
/**
* Reads the TSC via the best available CPU instruction
*
* Will execute a RDTSC or RDTSCP instruction followed by an instruction pipeline block
* CPUID instruction.
*
* @param [out] hi The high-order 32-bits
* @param [out] lo The low-order 32-bits
*
* Example:
* @code
* {
* <#example#>
* }
* @endcode
*/
void parcTimingIntel_rdtsc(unsigned *hi, unsigned *lo);
/**
* Checks initialization for RDTSCP instruction availability
*
* Checks if RDTSCP is availalbe on the system and sets a global.
*
* Example:
* @code
* {
* parcTiminIntel_RuntimeInit();
* }
* @endcode
*/
void parcTiminIntel_RuntimeInit(void);
#define _private_parcTiming_Init(prefix) \
parcTiminIntel_RuntimeInit(); \
static unsigned prefix ## _cycles_low0, prefix ## _cycles_high0; \
static unsigned prefix ## _cycles_low1, prefix ## _cycles_high1; \
\
__asm volatile ("CPUID\n\t" "RDTSC\n\t" \
"mov %%edx, %0\n\t" \
"mov %%eax, %1\n\t" : "=r" (prefix ## _cycles_high0), "=r" (prefix ## _cycles_low0):: \
"%rax", "%rbx", "%rcx", "%rdx"); \
parcTimingIntel_rdtsc(&(prefix ## _cycles_high1), &(prefix ## _cycles_low1)); \
__asm volatile ("CPUID\n\t" \
"RDTSC\n\t" \
"mov %%edx, %0\n\t" \
"mov %%eax, %1\n\t" : "=r" (prefix ## _cycles_high0), "=r" (prefix ## _cycles_low0):: \
"%rax", "%rbx", "%rcx", "%rdx"); \
parcTimingIntel_rdtsc(&(prefix ## _cycles_high1), &(prefix ## _cycles_low1));
#define _private_parcTiming_Start(prefix) \
parcTimingIntel_rdtsc(&(prefix ## _cycles_high0), &(prefix ## _cycles_low0));
#define _private_parcTiming_Stop(prefix) \
parcTimingIntel_rdtsc(&(prefix ## _cycles_high1), &(prefix ## _cycles_low1));
#define _private_parcTiming_CalculateStartTime(prefix) (((uint64_t) prefix ## _cycles_high0 << 32) | prefix ## _cycles_low0)
#define _private_parcTiming_CalculateStopTime(prefix) (((uint64_t) prefix ## _cycles_high1 << 32) | prefix ## _cycles_low1)
#define _private_parcTiming_Delta(prefix) \
(_private_parcTiming_CalculateStopTime(prefix) - _private_parcTiming_CalculateStartTime(prefix))
// No teardown work that we need to do
#define _private_parcTiming_Fini(prefix)
#endif // PARCTIMING_INTEL
#endif // libparc_parc_TimingIntel_h
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