515b69f8f8
Now we no longer have to rely on function pointers intentionally declared without specified argument types. This makes it easier to support functions with floating point parameters or return values as well as functions returning 64-bit values on 32-bit architectures. It also avoids having to explicitly cast strides to ptrdiff_t for example. Signed-off-by: Anton Khirnov <anton@khirnov.net>
124 lines
4.8 KiB
C
124 lines
4.8 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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void *checkasm_check_func(void *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 void *func_ref, *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_ref = checkasm_check_func((func_new = func), __VA_ARGS__))
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/* Declare the function prototype. The first argument is the return value, the remaining
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* arguments are the function parameters. Naming parameters is optional. */
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#define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__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_type *)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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void checkasm_checked_call(void *func, ...);
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#if ARCH_X86_64
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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 checked_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 declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
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= (void *)checkasm_checked_call;
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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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checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__))
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#elif ARCH_X86_32
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#define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
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#define call_new(...) checked_call(func_new, __VA_ARGS__)
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#endif
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#else
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#define declare_new(ret, ...)
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/* Call the function */
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#define call_new(...) ((func_type *)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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func_type *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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