f14fc55969
* commit '8bc67ec2c0d2b5444d51a1bed1d50f0e10d92717': Checkasm: assembly testing and benchmarking tool Merged-by: Michael Niedermayer <michael@niedermayer.cc>
116 lines
4.3 KiB
C
116 lines
4.3 KiB
C
/*
|
|
* Assembly testing and benchmarking tool
|
|
* Copyright (c) 2015 Henrik Gramner
|
|
* Copyright (c) 2008 Loren Merritt
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#ifndef CHECKASM_H
|
|
#define CHECKASM_H
|
|
|
|
#include <stdint.h>
|
|
#include "config.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "libavutil/timer.h"
|
|
|
|
void checkasm_check_h264pred(void);
|
|
|
|
intptr_t (*checkasm_check_func(intptr_t (*func)(), const char *name, ...))() av_printf_format(2, 3);
|
|
int checkasm_bench_func(void);
|
|
void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
|
|
void checkasm_update_bench(int iterations, uint64_t cycles);
|
|
void checkasm_report(const char *name, ...) av_printf_format(1, 2);
|
|
|
|
extern AVLFG checkasm_lfg;
|
|
#define rnd() av_lfg_get(&checkasm_lfg)
|
|
|
|
static av_unused intptr_t (*func_ref)();
|
|
static av_unused intptr_t (*func_new)();
|
|
|
|
#define BENCH_RUNS 1000 /* Trade-off between accuracy and speed */
|
|
|
|
/* Decide whether or not the specified function needs to be tested */
|
|
#define check_func(func, ...) ((func_new = (intptr_t (*)())func) &&\
|
|
(func_ref = checkasm_check_func(func_new, __VA_ARGS__)))
|
|
|
|
/* Indicate that the current test has failed */
|
|
#define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
|
|
|
|
/* Print the test outcome */
|
|
#define report(...) checkasm_report("" __VA_ARGS__)
|
|
|
|
/* Call the reference function */
|
|
#define call_ref(...) func_ref(__VA_ARGS__)
|
|
|
|
#if ARCH_X86 && HAVE_YASM
|
|
/* Verifies that clobbered callee-saved registers are properly saved and restored */
|
|
intptr_t checkasm_checked_call(intptr_t (*func)(), ...);
|
|
#endif
|
|
|
|
/* Call the function */
|
|
#if ARCH_X86_64 && HAVE_YASM
|
|
/* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
|
|
* This is done by clobbering the stack with junk around the stack pointer and calling the
|
|
* assembly function through x264_checkasm_call with added dummy arguments which forces all
|
|
* real arguments to be passed on the stack and not in registers. For 32-bit arguments the
|
|
* upper half of the 64-bit register locations on the stack will now contain junk which will
|
|
* cause misbehaving functions to either produce incorrect output or segfault. Note that
|
|
* even though this works extremely well in practice, it's technically not guaranteed
|
|
* and false negatives is theoretically possible, but there can never be any false positives.
|
|
*/
|
|
void checkasm_stack_clobber(uint64_t clobber, ...);
|
|
#define CLOB (UINT64_C(0xdeadbeefdeadbeef))
|
|
#define call_new(...) (checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
|
|
CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
|
|
checkasm_checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__))
|
|
#elif ARCH_X86_32 && HAVE_YASM
|
|
#define call_new(...) checkasm_checked_call(func_new, __VA_ARGS__)
|
|
#else
|
|
#define call_new(...) func_new(__VA_ARGS__)
|
|
#endif
|
|
|
|
/* Benchmark the function */
|
|
#ifdef AV_READ_TIME
|
|
#define bench_new(...)\
|
|
do {\
|
|
if (checkasm_bench_func()) {\
|
|
intptr_t (*tfunc)() = func_new;\
|
|
uint64_t tsum = 0;\
|
|
int ti, tcount = 0;\
|
|
for (ti = 0; ti < BENCH_RUNS; ti++) {\
|
|
uint64_t t = AV_READ_TIME();\
|
|
tfunc(__VA_ARGS__);\
|
|
tfunc(__VA_ARGS__);\
|
|
tfunc(__VA_ARGS__);\
|
|
tfunc(__VA_ARGS__);\
|
|
t = AV_READ_TIME() - t;\
|
|
if (t*tcount <= tsum*4 && ti > 0) {\
|
|
tsum += t;\
|
|
tcount++;\
|
|
}\
|
|
}\
|
|
checkasm_update_bench(tcount, tsum);\
|
|
}\
|
|
} while (0)
|
|
#else
|
|
#define bench_new(...)
|
|
#endif
|
|
|
|
#endif
|