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117 lines
4.4 KiB
117 lines
4.4 KiB
/* |
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* Assembly testing and benchmarking tool |
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* Copyright (c) 2015 Henrik Gramner |
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* Copyright (c) 2008 Loren Merritt |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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#ifndef CHECKASM_H |
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#define CHECKASM_H |
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#include <stdint.h> |
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#include "config.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/timer.h" |
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void checkasm_check_bswapdsp(void); |
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void checkasm_check_h264pred(void); |
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void checkasm_check_h264qpel(void); |
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intptr_t (*checkasm_check_func(intptr_t (*func)(), const char *name, ...))() av_printf_format(2, 3); |
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int checkasm_bench_func(void); |
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void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2); |
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void checkasm_update_bench(int iterations, uint64_t cycles); |
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void checkasm_report(const char *name, ...) av_printf_format(1, 2); |
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extern AVLFG checkasm_lfg; |
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#define rnd() av_lfg_get(&checkasm_lfg) |
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static av_unused intptr_t (*func_ref)(); |
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static av_unused intptr_t (*func_new)(); |
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#define BENCH_RUNS 1000 /* Trade-off between accuracy and speed */ |
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/* Decide whether or not the specified function needs to be tested */ |
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#define check_func(func, ...) ((func_new = (intptr_t (*)())func) &&\ |
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(func_ref = checkasm_check_func(func_new, __VA_ARGS__))) |
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/* Indicate that the current test has failed */ |
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#define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__) |
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/* Print the test outcome */ |
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#define report checkasm_report |
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/* Call the reference function */ |
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#define call_ref(...) func_ref(__VA_ARGS__) |
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#if ARCH_X86 && HAVE_YASM |
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/* Verifies that clobbered callee-saved registers are properly saved and restored */ |
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intptr_t checkasm_checked_call(intptr_t (*func)(), ...); |
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#endif |
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/* Call the function */ |
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#if ARCH_X86_64 && HAVE_YASM |
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/* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit. |
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* This is done by clobbering the stack with junk around the stack pointer and calling the |
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* assembly function through x264_checkasm_call with added dummy arguments which forces all |
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* real arguments to be passed on the stack and not in registers. For 32-bit arguments the |
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* upper half of the 64-bit register locations on the stack will now contain junk which will |
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* cause misbehaving functions to either produce incorrect output or segfault. Note that |
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* even though this works extremely well in practice, it's technically not guaranteed |
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* and false negatives is theoretically possible, but there can never be any false positives. |
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*/ |
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void checkasm_stack_clobber(uint64_t clobber, ...); |
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#define CLOB (UINT64_C(0xdeadbeefdeadbeef)) |
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#define call_new(...) (checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\ |
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CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\ |
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checkasm_checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__)) |
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#elif ARCH_X86_32 && HAVE_YASM |
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#define call_new(...) checkasm_checked_call(func_new, __VA_ARGS__) |
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#else |
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#define call_new(...) func_new(__VA_ARGS__) |
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#endif |
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/* Benchmark the function */ |
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#ifdef AV_READ_TIME |
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#define bench_new(...)\ |
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do {\ |
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if (checkasm_bench_func()) {\ |
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intptr_t (*tfunc)() = func_new;\ |
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uint64_t tsum = 0;\ |
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int ti, tcount = 0;\ |
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for (ti = 0; ti < BENCH_RUNS; ti++) {\ |
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uint64_t t = AV_READ_TIME();\ |
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tfunc(__VA_ARGS__);\ |
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tfunc(__VA_ARGS__);\ |
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tfunc(__VA_ARGS__);\ |
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tfunc(__VA_ARGS__);\ |
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t = AV_READ_TIME() - t;\ |
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if (t*tcount <= tsum*4 && ti > 0) {\ |
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tsum += t;\ |
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tcount++;\ |
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}\ |
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}\ |
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checkasm_update_bench(tcount, tsum);\ |
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}\ |
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} while (0) |
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#else |
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#define bench_new(...) while(0) |
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#endif |
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#endif
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