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dc7501e524
The functions may not clean up properly after using MMX registers. For the normal testing calls, the checkasm_checked_call functions will do the cleanup (and check that functions that should clean up do it as well), but when benchmarking functions that don't clean up, we don't currently properly clean up at all. This causes issues if a benchmarked function is followed by testing of a function that is supposed to not clobber the MMX/FPU state but doesn't touch it at all. Signed-off-by: Martin Storsjö <martin@martin.st>
174 lines
7.6 KiB
C
174 lines
7.6 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 TESTS_CHECKASM_CHECKASM_H
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#define TESTS_CHECKASM_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/cpu.h"
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#include "libavutil/internal.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_dcadsp(void);
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void checkasm_check_fmtconvert(void);
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void checkasm_check_h264dsp(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_hevc_mc(void);
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void checkasm_check_synth_filter(void);
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void checkasm_check_v210enc(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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/* float compare utilities */
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int float_near_ulp(float a, float b, unsigned max_ulp);
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int float_near_abs_eps(float a, float b, float eps);
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int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
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int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
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unsigned len);
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int float_near_abs_eps_array(const float *a, const float *b, float eps,
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unsigned len);
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int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
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unsigned max_ulp, unsigned len);
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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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#define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, 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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* and that either no MMX registers are touched or emms is issued */
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void checkasm_checked_call(void *func, ...);
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/* Verifies that clobbered callee-saved registers are properly saved and restored
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* and issues emms for asm functions which are not required to do so */
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void checkasm_checked_call_emms(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 declare_new_emms(cpu_flags, ret, ...) \
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ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
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((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
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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 declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
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((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
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(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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#elif ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
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/* Use a dummy argument, to offset the real parameters by 2, not only 1.
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* This makes sure that potential 8-byte-alignment of parameters is kept the same
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* even when the extra parameters have been removed. */
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void checkasm_checked_call_vfp(void *func, int dummy, ...);
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void checkasm_checked_call_novfp(void *func, int dummy, ...);
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extern void (*checkasm_checked_call)(void *func, int dummy, ...);
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#define declare_new(ret, ...) ret (*checked_call)(void *, int dummy, __VA_ARGS__) = (void *)checkasm_checked_call;
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#define call_new(...) checked_call(func_new, 0, __VA_ARGS__)
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#elif ARCH_AARCH64 && !defined(__APPLE__)
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void checkasm_checked_call(void *func, ...);
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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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#else
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#define declare_new(ret, ...)
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#define declare_new_emms(cpu_flags, 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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#ifndef declare_new_emms
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#define declare_new_emms(cpu_flags, ret, ...) declare_new(ret, __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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emms_c();\
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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 /* TESTS_CHECKASM_CHECKASM_H */
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